VIESSMANN Vitocal 150 Air/Water Heat Pump Instruction Manual

June 9, 2024
VIESSMANN

Vitocal 150 Air/Water Heat Pump

Service instructions
for contractors
System configuration and diagnosis for heat pumps with Viessmann One Base Using “ViGuide App”/”ViGuide Plus”/”ViGuide Pro”

VIESMANN

System configuration and diagnosis for heat pumps with Viessmann One Base

6194799 GB 3/2022

Please keep safe.

Safety instructions Safety instructions

Please follow these safety instructions closely to prevent accidents and material losses.

Safety instructions explained
Danger This symbol warns against the risk of injury.
! Please note This symbol warns against the risk of material losses and environmental pollution.
Note Details identified by the word “Note” contain additional information.

Different safety instructions need to be observed for the respective heat pumps, depending on which refrigerant is used.
Safety instructions for respective heat pump Installation and service instructions

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2

6194799

Index
1. Introduction
2. Parameters

Index
Scope of functions ……………………………………………………………………… 6 Heat pumps ………………………………………………………………………………. 6 System examples ………………………………………………………………………. 7 Parameter settings ……………………………………………………………………… 7 Troubleshooting …………………………………………………………………………. 7
General parameters ……………………………………………………………………. 8 896.0 Display correction for outside temperature …………………………. 8 919.0 Outside temperature damping factor …………………………………. 8 Parameters for heating/cooling circuits ………………………………………….. 9 897.0 Screed drying ………………………………………………………………… 9 933.5 Temperature differential, flow temperature, heating/cooling cir-
cuit 1 ……………………………………………………………………………………… 10 933.6 Room temperature influence, heating, heating/cooling circuit 1 10 934.5 Temperature differential, flow temperature, heating/cooling cir-
cuit 2 ……………………………………………………………………………………… 10 934.6 Room temperature influence, heating, heating/cooling circuit 2 10 935.5 Temperature differential, flow temperature, heating/cooling cir-
cuit 3 ……………………………………………………………………………………… 10 935.6 Room temperature influence, heating, heating/cooling circuit 3 10 936.5 Temperature differential, flow temperature, heating/cooling cir-
cuit 4 ……………………………………………………………………………………… 10 936.6 Room temperature influence, heating, heating/cooling circuit 4 11 1100.0 Min. speed, secondary pump ………………………………………….. 11 1100.1 Max. speed, secondary pump …………………………………………. 11 1100.2 Set speed, secondary pump, heating ………………………………. 11 1192.0 Min. flow temperature, heating, heating/cooling circuit 1 …….. 11 1192.1 Max. flow temperature, heating, heating/cooling circuit 1 ……. 11 1193.0 Min. flow temperature, heating, heating/cooling circuit 2 …….. 11 1193.1 Max. flow temperature, heating, heating/cooling circuit 2 ……. 12 1194.0 Min. flow temperature, heating, heating/cooling circuit 3 …….. 12 1194.1 Max. flow temperature, heating, heating/cooling circuit 3 ……. 12 1195.0 Min. flow temperature, heating, heating/cooling circuit 4 …….. 12 1195.1 Max. flow temperature, heating, heating/cooling circuit 4 ……. 13 1240.0 Operating mode, secondary pump ………………………………….. 13 1395.1 Heating limit, economy function, outside temperature, heat-
ing/cooling circuit 1 ………………………………………………………………….. 13 1396.1 Heating limit, economy function, outside temperature, heat-
ing/cooling circuit 2 ………………………………………………………………….. 13 1397.1 Heating limit, economy function, outside temperature, heat-
ing/cooling circuit 3 ………………………………………………………………….. 14 1398.1 Heating limit, economy function, outside temperature, heat-
ing/cooling circuit 4 ………………………………………………………………….. 14 2405.1 Set flow temperature, cooling, underfloor heating circuit,
heating/cooling circuit 1 ……………………………………………………………. 14 2405.2 Set flow temperature, cooling with fan convector, heating/
cooling circuit 1 ……………………………………………………………………….. 15 2406.1 Set flow temperature, cooling, underfloor heating circuit,
heating/cooling circuit 2 ……………………………………………………………. 15 2406.2 Set flow temperature, cooling with fan convector, heating/
cooling circuit 2 ……………………………………………………………………….. 15 2409.0 Min. limit of set flow temperature for cooling, heating/cooling
circuit 1 ………………………………………………………………………………….. 15 2409.1 Max. limit of set flow temperature for cooling, heating/cooling
circuit 1 ………………………………………………………………………………….. 15 2410.0 Min. limit of set flow temperature for cooling, heating/cooling
circuit 2 ………………………………………………………………………………….. 15 2410.1 Max. limit of set flow temperature for cooling, heating/cooling
circuit 2 ………………………………………………………………………………….. 16
3

Index Index
4

2413.0 Start condition, cooling, heating/cooling circuit 1 ……………….. 16 2413.1 Stop condition, cooling, heating/cooling circuit 1 ……………….. 16 2414.0 Start condition, cooling, heating/cooling circuit 2 ……………….. 16 2414.1 Stop condition, cooling, heating/cooling circuit 2 ……………….. 16 2426.0 Enable economy function, outside temperature, heating/cool-
ing circuit 1 …………………………………………………………………………….. 17 2426.1 Hysteresis, economy function, outside temperature, heating/
cooling circuit 1 ……………………………………………………………………….. 17 2427.0 Enable economy function, outside temperature, heating/cool-
ing circuit 2 …………………………………………………………………………….. 17 2427.1 Hysteresis, economy function, outside temperature, heating/
cooling circuit 2 ……………………………………………………………………….. 17 2428.0 Enable economy function, outside temperature, heating/cool-
ing circuit 3 …………………………………………………………………………….. 18 2428.1 Hysteresis, economy function, outside temperature, heating/
cooling circuit 3 ……………………………………………………………………….. 18 2429.0 Enable economy function, outside temperature, heating/cool-
ing circuit 4 …………………………………………………………………………….. 18 2429.1 Hysteresis, economy function, outside temperature, heating/
cooling circuit 4 ……………………………………………………………………….. 18 2452.0 Start hysteresis, cooling, heating/cooling circuit 1 ……………… 19 2452.1 Stop hysteresis, cooling, heating/cooling circuit 1 ……………… 19 2453.0 Start hysteresis, cooling, heating/cooling circuit 2 ……………… 19 2453.1 Stop hysteresis, cooling, heating/cooling circuit 2 ……………… 19 2498.0 Pump type, secondary pump ………………………………………….. 19 2499.0 Pump type, heating/cooling circuit 1 ………………………………… 19 2500.0 Pump type, heating/cooling circuit 2 ………………………………… 20 2501.0 Pump type, heating/cooling circuit 3 ………………………………… 20 2502.0 Pump type, heating/cooling circuit 4 ………………………………… 20 Parameters for DHW heating ……………………………………………………….. 21 497.0 Operation of DHW circulation pump ………………………………….. 21 497.1 DHW circulation pump for increased DHW hygiene …………….. 21 497.2 DHW circulation pump for DHW heating ……………………………. 21 497.3 Number of cycles DHW circulation pump …………………………… 22 503.0 Scald protection ……………………………………………………………… 22 504.1 Min. set cylinder temperature …………………………………………… 22 504.3 Max. set cylinder temperature ………………………………………….. 22 874.0 Set cylinder temperature for increased DHW hygiene function 22 1085.0 Start hysteresis, set cylinder temperature ………………………… 23 1085.1 Stop hysteresis, set cylinder temperature ………………………… 23 1087.0 Max. duration, DHW heating ………………………………………….. 23 1087.1 Min. delay until next time DHW is heated …………………………. 23 1101.2 Set speed, secondary pump for DHW heating …………………… 23 Parameters for low-noise mode ……………………………………………………. 24 2540.0. Low-noise mode ………………………………………………………….. 24 Parameters for electric booster heater ………………………………………….. 24 2340.0 Enable instantaneous heating water heater, central heating .. 24 2340.1 Enable instantaneous heating water heater, DHW heating …. 24 2544.0 Enable instantaneous heating water heater, power-OFF ……. 25 2545.0 Enable instantaneous heating water heater, power-OFF via
Smart Grid ……………………………………………………………………………… 25 Parameters for external heat generator …………………………………………. 25 2404.0 Dual mode operation, external heat generator ………………….. 25 2404.1 Dual mode temperature …………………………………………………. 26 2404.2 Temperature limit, alternative operation …………………………… 26 2404.3 Control strategy ……………………………………………………………. 26 2626.0 Max. output, electric booster heater ………………………………… 27 2796.0 Enable external heat generator, central heating ………………… 27 2796.1 Enable external heat generator, DHW heating ………………….. 27

6194799

Index (cont.)
3. Fault and warning messages, Vitocal 200-S/222-S
4. Fault and warning messages, Vitocal 150-A/151A, Vitocal 250-A/252-A
5. Fault and warning messages, Vitocal 250-AH
6. Certificates 7. Keyword index

Index
2796.2 Enable external heat generator, DHW heating emergency mode ……………………………………………………………………………………… 27
2796.3 Enable external heat generator, central heating emergency mode ……………………………………………………………………………………… 27
2796.4 Enable external heat generator, screed drying ………………….. 28 2796.5 Enable external heat generator, defrosting ……………………….. 28 2796.6 Enable external heat generator for increased DHW hygiene
function ………………………………………………………………………………….. 28 2796.7 Enable external heat generator, frost protection ………………… 28 2796.8 Configuration, external heat generator …………………………….. 28 2853.0 Start threshold, external heat generator …………………………… 28 2940.0 Start delay, external heat generator …………………………………. 29 2940.1 Min. runtime, external heat generator ………………………………. 29 2940.2 Stop delay, external heat generator …………………………………. 29 Parameters for Smart Grid …………………………………………………………… 29 2543.0 Smart Grid room temperature set value increase, heating ….. 29 2543.1 Smart Grid room temperature set value increase, cooling ….. 29 2543.2 Smart Grid set value increase for DHW heating ………………… 29 2543.3 Smart Grid set value increase for heating water buffer cylin-
der ………………………………………………………………………………………… 29 2560.0 Power-OFF/Smart Grid selection ……………………………………. 30
Fault messages …………………………………………………………………………. 31 Warning messages …………………………………………………………………….. 47
Fault messages …………………………………………………………………………. 50 Warning messages …………………………………………………………………….. 68
Fault messages …………………………………………………………………………. 72 Warning messages …………………………………………………………………….. 88
Declarations of conformity for respective heat pump ……………………….. 93
…………………………………………………………………………………………………. 94

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5

Introduction Scope of functions

These instructions contain the following information for air source heat pumps with indoor and outdoor unit and the Viessmann One Base control platform: Control parameters for matching the heat pump to
different requirements and operating conditions Troubleshooting measures

Further information is available in the following documents for the respective heat pump:

Information

Operating instructions

Electronics modules and electrical connections

Position of temperature sensors and other components

Commissioning

Settings on the HMI program-

X

ming unit

Further messages

Performance graphs for heating and cooling

Specification

Installation and service instructions
X

Connection and wiring diagram
X

Technical guide

X

X X

X

X

X

X

X

Heat pumps
Heat pump Vitocal 150-A Vitocal 151-A Vitocal 200-S
Vitocal 222-S
Vitocal 250-A
Vitocal 250-AH Vitocal 250-SH

Type
AWO(-M)-E-AC 151.A AWO(-M)-E-AC-AF 151.A AWOT(-M)-E-AC 151.A AWOT(-M)-E-AC-AF 151.A AWB-M-E-AC 201.E AWB-M-E-AC-AF 201.E AWB-M-E-AC 201.E 2C AWB-M-E-AC-AF 201.E 2C AWBT-M-E-AC 201.E AWBT-M-E-AC-AF 201.E AWBT-M-E-AC 201.E 2C AWBT-M-E -AC-AF 201.E 2C AWO(-M)-E-AC 251.A AWO(-M)-E-AC-AF 251.A AWO(-M)-E-AC 251.A 2C AWO(-M)-E-AC-AF 251.A 2C HAWO(-M)-AC 252.A HAWO(-M)-AC-AF 252.A HAWB-M-AC 252.B HAWB-M-AC-AF 252.B

Implementation Split
X X X X X X X X
X X

Monoblock X X X X
X X X X X X

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6

Heat pumps (cont.)

Heat pump

Type

Vitocal 252-A

AWOT(-M)-E-AC 251.A AWOT(-M)-E-AC-AF 251.A AWOT(-M)-E-AC 251.A 2C AWOT(-M)-E -AC-AF 251.A 2C

Introduction

Implementation Split

Monoblock X X X X

System examples
System examples with hydraulic and electric connection diagrams as well a detailed function description are available to aid the understanding of the heat pump control unit function.

Detailed information regarding system examples: www.viessmann-schemes.com

Parameter settings

Depending on the system equipment and which user interface is selected, not all parameters will be available.
Some parameters can be set with the aid of the commissioning assistant via the HMI programming unit or via the ViGuide app. Heat pump installation and service instructions
The parameters in these instructions are adjustable via “ViGuide app”, “ViGuide Plus” or “ViGuide Pro”: See page 8 onwards.

The functional description of these parameters is aimed at heat pump contractors.
The factory settings and setting ranges for the parameters may vary for different heat pumps and system configurations. These values are read out from the heat pump control unit via the respective app and displayed on the app’s user interface.

Troubleshooting

Messages are displayed on the HMI programming unit as well as via the ViGuide user interfaces.

Heat pump
Vitocal 200-S/222-S Vitocal 150-A/151-A Vitocal 250-A/252-A Vitocal 250-AH

Fault and warning messages Page 31 Page 50
Page 72

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7

Parameter
6194799

Parameters General parameters

896.0 Display correction for outside temperature

To compensate for systematic measuring faults, a correction value (offset) can be set for the outside temperature sensor.

The correction value can be positive or negative. The correction value is added to the current outside temperature measurement.

919.0 Outside temperature damping factor

Time constant for calculating the adjusted outside temperature (low pass filter)
This outside temperature is used for: Calculating the set flow temperature for central heat-
ing Switching room cooling on/off
Note In order to achieve a system response within the intended time window, outside temperature values with non adjustable damping are used for other functions (e.g. the frost protection function).

In practical use, this characteristic results not only in an adjustment but also a delay in capturing the outside temperature.
A B

The continuous averaging of actual temperatures reduces the influence of brief temperature fluctuations. The mathematical method applied acts like an attenuation. With this attenuation, the adjusted outside temperature achieves the following values after a sudden temperature change: 63 % of the change after a single averaging interval 95 % of the change after three averaging intervals

t Fig. 2
A Outside temperature (not adjusted) B Adjusted outside temperature

100%

63%

37%

AB

AB

t

Fig. 1

A Time of the sudden temperature change B Expiry of one averaging interval

8

Parameters for heating/cooling circuits

Parameters

Important information Room cooling is possible only via the heating/cooling
circuits connected directly to the indoor unit: Depending on heat pump type, via heating/cooling circuit 1 and/or heating/cooling circuit 2 Room cooling is not possible in combination with a heating water buffer cylinder; only room heating via all heating/cooling circuits is possible. The type of cooling circuit is configured in the commissioning assistant, e.g. cooling via underfloor heating circuit, cooling via fan convectors, etc. Temperature adjustment is dependent on the selected type of cooling circuit. For cooling via fan convectors, for example, the set flow temperature can be set to a lower value than for cooling via underfloor heating circuits.

6194799
Parameter

897.0 Screed drying

Selection of profiles for screed drying: Screed drying starts straight away and affects all heating circuits. Set speed of the secondary pump during screed drying: 1100.2
Note If screed drying is interrupted (e.g. due to a power cut), screed drying resumes automatically from the last position once the heat pump control unit has been restarted.

Value 0 1
2

Meaning No screed drying or end screed drying. Temperature/time profile 1 (in acc. with EN 1264-4)
/°C 50 40 30 20 10 1 5 10 15 20 25 30 t/d
Temperature/time profile 2 (in acc. with ZV parquet and flooring technology)

Value 4
5
6

Meaning Temperature/time profile 4
/°C 50 40 30 20 10
1 5 10 15 20 25 30 t/d
Temperature/time profile 5
/°C 50 40 30 20 10 1 5 10 15 20 25 30 t/d
Temperature/time profile 6
/°C 50 40 30 20 10
1 5 10 15 20 25 30 t/d

/°C 50 40 30 20 10

1 5 10 15 20 25 30 t/d

3

Temperature/time profile 3 (in acc. with Austri-

an Standards)

/°C 50 40 30 20 10
1 5 10 15 20 25 30 t/d

9

Parameter
6194799

Parameters Parameters for heating/cooling circuits (cont.)

933.5 Temperature differential, flow temperature, heating/cooling circuit 1

The required heating water temperature for heating/ cooling circuit 1 with mixer corresponds to the set flow temperature for this heating/cooling circuit, plus the temperature differential set here.

This enables the mixer to regulate more effectively and prevents it from being permanently open.

933.6 Room temperature influence, heating, heating/cooling circuit 1

Only for heating operation via heating/cooling circuit 1 in conjunction with a room temperature sensor

Value 0
1

Meaning
Weather-compensated control without room temperature influence
Weather-compensated control with room temperature influence

934.5 Temperature differential, flow temperature, heating/cooling circuit 2

The required heating water temperature for heating/ cooling circuit 2 with mixer corresponds to the set flow temperature for this heating/cooling circuit, plus the temperature differential set here.

This enables the mixer to regulate more effectively and prevents it from being permanently open.

934.6 Room temperature influence, heating, heating/cooling circuit 2

Only for heating operation via heating/cooling circuit 2 in conjunction with a room temperature sensor

Value 0
1

Meaning
Weather-compensated control without room temperature influence
Weather-compensated control with room temperature influence

935.5 Temperature differential, flow temperature, heating/cooling circuit 3

The required heating water temperature for heating/ cooling circuit 3 with mixer corresponds to the set flow temperature for this heating/cooling circuit, plus the temperature differential set here.

This enables the mixer to regulate more effectively and prevents it from being permanently open.

935.6 Room temperature influence, heating, heating/cooling circuit 3

Only for heating operation via heating/cooling circuit 3 in conjunction with a room temperature sensor

Value 0
1

Meaning
Weather-compensated control without room temperature influence
Weather-compensated control with room temperature influence

936.5 Temperature differential, flow temperature, heating/cooling circuit 4

The required heating water temperature for heating/ cooling circuit 4 with mixer corresponds to the set flow temperature for this heating/cooling circuit, plus the temperature differential set here.

This enables the mixer to regulate more effectively and prevents it from being permanently open.

10

Parameters for heating/cooling circuits (cont.)

Parameters

936.6 Room temperature influence, heating, heating/cooling circuit 4

Only for heating operation via heating/cooling circuit 4 in conjunction with a room temperature sensor

Value 0
1

Meaning
Weather-compensated control without room temperature influence
Weather-compensated control with room temperature influence

1100.0 Min. speed, secondary pump Minimum speed of the internal secondary circuit pump

Do not adjust!

6194799
Parameter

1100.1 Max. speed, secondary pump Maximum speed of the internal secondary circuit pump Do not adjust!

1100.2 Set speed, secondary pump, heating
Set speed of the internal secondary pump for central heating

1192.0 Min. flow temperature, heating, heating/cooling circuit 1

Set flow temperature limit for heating via heating/cooling circuit 1
The set flow temperature for heating mode results from the following: Weather- compensated heating mode: In line with the
set heating curve and the set room temperature Room temperature-dependent heating mode (room
temperature sensor required): From the differential between the set and the actual room temperature

If the calculation results in a lower set flow temperature than the value set here, the set flow temperature will be limited to this value. This value cannot be set higher than max. value 1192.1.

1192.1 Max. flow temperature, heating, heating/cooling circuit 1

Set flow temperature limit for heating via heating/cooling circuit 1
The set flow temperature for heating mode results from the following: Weather- compensated heating mode: In line with the
set heating curve and the set room temperature Room temperature-dependent heating mode (room
temperature sensor required): From the differential between the set and the actual room temperature
If the calculation results in a higher set flow temperature than the value set here, the set flow temperature will be limited to this value.

Note Since the heat pump control unit only limits the set
value with this parameter, a temperature limiter for restricting the maximum temperature (accessories) must be installed in the flow of an underfloor heating circuit. If heating/cooling circuit 1 is a directly connected heating/cooling circuit without mixer, the max. set flow temperature cannot be adjusted. In this case, the max. set flow temperature is equivalent to the highest required set system flow temperature.

1193.0 Min. flow temperature, heating, heating/cooling circuit 2 Set flow temperature limit for heating via heating/cooling circuit 2
11

Parameter
6194799

Parameters Parameters for heating/cooling circuits (cont.)

The set flow temperature for heating mode results from the following: Weather- compensated heating mode: In line with the
set heating curve and the set room temperature Room temperature-dependent heating mode (room
temperature sensor required): From the differential between the set and the actual room temperature

If the calculation results in a lower set flow temperature than the value set here, the set flow temperature will be limited to this value. This value cannot be set higher than max. value 1193.1.

1193.1 Max. flow temperature, heating, heating/cooling circuit 2

Set flow temperature limit for heating via heating/cooling circuit 2
The set flow temperature for heating mode results from the following: Weather- compensated heating mode: In line with the
set heating curve and the set room temperature Room temperature-dependent heating mode (room
temperature sensor required): From the differential between the set and the actual room temperature
If the calculation results in a higher set flow temperature than the value set here, the set flow temperature will be limited to this value.

Note Since the heat pump control unit only limits the set
value with this parameter, a temperature limiter for restricting the maximum temperature (accessories) must be installed in the flow of an underfloor heating circuit. For heat pump type … 2C, heating/cooling circuit 2 can be connected directly to the heat pump. In this case, the max. set flow temperature cannot be higher than the max. value for heating/cooling circuit 1 in 1192.1.

1194.0 Min. flow temperature, heating, heating/cooling circuit 3

Set flow temperature limit for heating via heating/cooling circuit 3
The set flow temperature for heating mode results from the following: Weather- compensated heating mode: In line with the
set heating curve and the set room temperature Room temperature-dependent heating mode (room
temperature sensor required): From the differential between the set and the actual room temperature

If the calculation results in a lower set flow temperature than the value set here, the set flow temperature will be limited to this value. This value cannot be set higher than max. value 1194.1.

1194.1 Max. flow temperature, heating, heating/cooling circuit 3

Set flow temperature limit for heating via heating/cooling circuit 3
The set flow temperature for heating mode results from the following: Weather- compensated heating mode: In line with the
set heating curve and the set room temperature Room temperature-dependent heating mode (room
temperature sensor required): From the differential between the set and the actual room temperature

If the calculation results in a higher set flow temperature than the value set here, the set flow temperature will be limited to this value.
Note Since the heat pump control unit only limits the set value with this parameter, a temperature limiter for restricting the maximum temperature (accessories) must be installed in the flow of an underfloor heating circuit.

1195.0 Min. flow temperature, heating, heating/cooling circuit 4
Set flow temperature limit for heating via heating/cooling circuit 4

12

6194799
Parameter

Parameters for heating/cooling circuits (cont.)

Parameters

The set flow temperature for heating mode results from the following: Weather- compensated heating mode: In line with the
set heating curve and the set room temperature Room temperature-dependent heating mode (room
temperature sensor required): From the differential between the set and the actual room temperature

If the calculation results in a lower set flow temperature than the value set here, the set flow temperature will be limited to this value. This value cannot be set higher than max. value 1195.1.

1195.1 Max. flow temperature, heating, heating/cooling circuit 4

Set flow temperature limit for heating via heating/cooling circuit 4
The set flow temperature for heating mode results from the following: Weather- compensated heating mode: In line with the
set heating curve and the set room temperature Room temperature-dependent heating mode (room
temperature sensor required): From the differential between the set and the actual room temperature

If the calculation results in a higher set flow temperature than the value set here, the set flow temperature will be limited to this value.
Note Since the heat pump control unit only limits the set value with this parameter, a temperature limiter for restricting the maximum temperature (accessories) must be installed in the flow of an underfloor heating circuit.

1240.0 Operating mode, secondary pump
If the secondary pump is switched on, this circulation pump runs in the selected operating mode.

Value 0 1 2 3

Meaning Do not adjust! Do not adjust! Do not adjust! Do not adjust!

Value 4
5 6 7

Meaning Operation with constant speed setting (1100.2) Do not adjust! Do not adjust! Do not adjust!

1395.1 Heating limit, economy function, outside temperature, heating/cooling circuit 1

This economy function is also referred to as the heating circuit pump logic function or summer economy control. An outside temperature limit can be set as the heating limit for each heating/cooling circuit.

Note The heating circuit pump logic function cannot be
deactivated. The hysteresis of -1 K/+1 K cannot be changed.

The heating limit influences the start and stop behaviour of the circulation pump for the heating/cooling circuit: If the outside temperature is 1 K higher than the set
value, the circulation pump for heating/cooling circuit 1 switches off. If the adjusted outside temperature is 1 K lower than the set value, the circulation pump for heating/cooling circuit 1 switches on.

1396.1 Heating limit, economy function, outside temperature, heating/cooling circuit 2

This economy function is also referred to as the heating circuit pump logic function or summer economy control.

An outside temperature limit can be set as the heating limit for each heating/cooling circuit.

13

Parameter
6194799

Parameters Parameters for heating/cooling circuits (cont.)

The heating limit influences the start and stop behaviour of the circulation pump for the heating/cooling circuit: If the outside temperature is 1 K higher than the set
value, the circulation pump for heating/cooling circuit 2 switches off. If the adjusted outside temperature is 1 K lower than the set value, the circulation pump for heating/cooling circuit 2 switches on.

Note The heating circuit pump logic function cannot be
deactivated. The hysteresis of -1 K/+1 K cannot be changed.

1397.1 Heating limit, economy function, outside temperature, heating/cooling circuit 3

This economy function is also referred to as the heating circuit pump logic function or summer economy control. An outside temperature limit can be set as the heating limit for each heating/cooling circuit.

Note The heating circuit pump logic function cannot be
deactivated. The hysteresis of -1 K/+1 K cannot be changed.

The heating limit influences the start and stop behaviour of the circulation pump for the heating/cooling circuit: If the outside temperature is 1 K higher than the set
value, the circulation pump for heating/cooling circuit 3 switches off. If the adjusted outside temperature is 1 K lower than the set value, the circulation pump for heating/cooling circuit 3 switches on. For determination of the adjusted outside temperature: See 919.0.

1398.1 Heating limit, economy function, outside temperature, heating/cooling circuit 4

This economy function is also referred to as the heating circuit pump logic function or summer economy control. An outside temperature limit can be set as the heating limit for each heating/cooling circuit.

Note The heating circuit pump logic function cannot be
deactivated. The hysteresis of -1 K/+1 K cannot be changed.

The heating limit influences the start and stop behaviour of the circulation pump for the heating/cooling circuit: If the outside temperature is 1 K higher than the set
value, the circulation pump for heating/cooling circuit 4 switches off. If the adjusted outside temperature is 1 K lower than the set value, the circulation pump for heating/cooling circuit 4 switches on. For determination of the adjusted outside temperature: See 919.0.

2405.1 Set flow temperature, cooling, underfloor heating circuit, heating/cooling circuit 1

Fixed set flow temperature for cooling via heating/cooling circuit 1 Requirement: Heating/cooling circuit 1 is configured as an underfloor heating circuit.

Upon demand via the set room temperature, cooling is performed with the flow temperature set here.
The value cannot be set lower than 2409.0 or higher than 2409.1.

14

Parameters for heating/cooling circuits (cont.)

Parameters

2405.2 Set flow temperature, cooling with fan convector, heating/cooling circuit 1

Fixed set flow temperature for cooling via heating/cooling circuit 1 Requirement: Heating/cooling circuit 1 is configured as a fan convector.

Upon demand via the set room temperature, cooling is performed with the flow temperature set here.
The value cannot be set lower than 2409.0 or higher than 2409.1.

2406.1 Set flow temperature, cooling, underfloor heating circuit, heating/cooling circuit 2

Fixed set flow temperature for cooling via heating/cooling circuit 2 Requirement: Heating/cooling circuit 2 is configured as an underfloor heating circuit.

Upon demand via the set room temperature, cooling is performed with the flow temperature set here.
The value cannot be set lower than 2410.0 or higher than 2410.1.

6194799
Parameter

2406.2 Set flow temperature, cooling with fan convector, heating/cooling circuit 2

Fixed set flow temperature for cooling via heating/cooling circuit 2 Requirement: Heating/cooling circuit 2 is configured as a fan convector.

Upon demand via the set room temperature, cooling is performed with the flow temperature set here.
The value cannot be set lower than 2410.0 or higher than 2410.1.

2409.0 Min. limit of set flow temperature for cooling, heating/cooling circuit 1

Limiting of set flow temperature for cooling via heating/ cooling circuit 1
The set flow temperature for cooling mode results from the following: Weather- compensated cooling mode: Constant set
flow temperature, depending on the type of cooling circuit selected during commissioning, e.g. cooling via underfloor heating circuit, cooling via fan convector Room temperature-dependent cooling mode: From the differential between the set and the actual room temperature

If the setting results in a lower set flow temperature than the value set here, the set flow temperature will be limited to this value.

2409.1 Max. limit of set flow temperature for cooling, heating/cooling circuit 1

Limiting of set flow temperature for cooling via heating/ cooling circuit 1
The set flow temperature for cooling mode results from the following: Weather- compensated cooling mode: Constant set
flow temperature, depending on the type of cooling circuit selected during commissioning, e.g. cooling via underfloor heating circuit, cooling via fan convector Room temperature-dependent cooling mode: From the differential between the set and the actual room temperature

If the setting results in a higher set flow temperature than the value set here, the set flow temperature will be limited to this value.

2410.0 Min. limit of set flow temperature for cooling, heating/cooling circuit 2
Limiting of set flow temperature for cooling via heating/ cooling circuit 2
15

Parameter
6194799

Parameters Parameters for heating/cooling circuits (cont.)

The set flow temperature for cooling mode results from the following: Weather- compensated cooling mode: Constant set
flow temperature, depending on the type of cooling circuit selected during commissioning, e.g. cooling via underfloor heating circuit, cooling via fan convector Room temperature-dependent cooling mode: From the differential between the set and the actual room temperature

If the setting results in a lower set flow temperature than the value set here, the set flow temperature will be limited to this value.

2410.1 Max. limit of set flow temperature for cooling, heating/cooling circuit 2

Limiting of set flow temperature for cooling via heating/ cooling circuit 2
The set flow temperature for cooling mode results from the following: Weather- compensated cooling mode: Constant set
flow temperature, depending on the type of cooling circuit selected during commissioning, e.g. cooling via underfloor heating circuit, cooling via fan convector Room temperature-dependent cooling mode: From the differential between the set and the actual room temperature

If the setting results in a higher set flow temperature than the value set here, the set flow temperature will be limited to this value.

2413.0 Start condition, cooling, heating/cooling circuit 1

Start condition for operation of the heating circuit pump in heating/cooling circuit 1 for weather-compensated room cooling:

If the adjusted outside temperature exceeds the set room temperature selected at the HMI programming unit plus the value set here, the circulation pump switches on.

2413.1 Stop condition, cooling, heating/cooling circuit 1

Stop condition for operation of the heating circuit pump in heating/cooling circuit 1 for weather-compensated room cooling:

If the outside temperature falls below the set room temperature selected at the HMI programming unit
plus 2413.0 by the value set here, the circulation pump switches off.

2414.0 Start condition, cooling, heating/cooling circuit 2

Start condition for operation of the heating circuit pump in heating/cooling circuit 2 for weather-compensated room cooling:

If the adjusted outside temperature exceeds the set room temperature selected at the HMI programming unit plus the value set here, the circulation pump switches on.

2414.1 Stop condition, cooling, heating/cooling circuit 2

Stop condition for operation of the heating circuit pump in heating/cooling circuit 2 for weather-compensated room cooling:

If the outside temperature falls below the set room temperature selected at the HMI programming unit
plus 2414.0 by the value set here, the circulation pump switches off.

16

6194799
Parameter

Parameters for heating/cooling circuits (cont.)

Parameters

2426.0 Enable economy function, outside temperature, heating/cooling circuit 1

Energy saving function for the heating circuit pump of heating/cooling circuit 1 for weather-compensated central heating

Value 0 1

Meaning
Energy saving function off
Energy saving function on: If the outside temperature exceeds the set
room temperature selected at the HMI programming unit plus 2426.1, the circulation pump switches off. If the outside temperature falls below the set room temperature selected at the HMI programming unit plus 2426.1 ­ 1 K, the circulation pump switches back on.

2426.1 Hysteresis, economy function, outside temperature, heating/cooling circuit 1

Hysteresis for energy saving function of the heating circuit pump of heating/cooling circuit 1 for weathercompensated central heating: Energy saving function is active if 2426.0 is set to 1.

Conditions for starting and stopping the heating circuit
pump: If the outside temperature exceeds the set room
temperature selected at the HMI programming unit
plus 2426.1, the circulation pump switches off. If the outside temperature falls below the set room
temperature selected at the HMI programming unit
plus 2426.1 ­ 1 K, the circulation pump switches back on.

2427.0 Enable economy function, outside temperature, heating/cooling circuit 2

Energy saving function for the heating circuit pump of heating/cooling circuit 2 for weather-compensated central heating

Value 0 1

Meaning
Energy saving function off
Energy saving function on: If the outside temperature exceeds the set
room temperature selected at the HMI programming unit plus 2427.1, the circulation pump switches off. If the outside temperature falls below the set room temperature selected at the HMI programming unit plus 2427.1 ­ 1 K, the circulation pump switches back on.

2427.1 Hysteresis, economy function, outside temperature, heating/cooling circuit 2

Hysteresis for energy saving function of the heating circuit pump of heating/cooling circuit 2 for weathercompensated central heating: Energy saving function is active if 2427.0 is set to 1.

Conditions for starting and stopping the heating circuit
pump: If the outside temperature exceeds the set room
temperature selected at the HMI programming unit
plus 2427.1, the circulation pump switches off. If the outside temperature falls below the set room
temperature selected at the HMI programming unit
plus 2427.1 ­ 1 K, the circulation pump switches back on.

17

Parameter
6194799

Parameters Parameters for heating/cooling circuits (cont.)

2428.0 Enable economy function, outside temperature, heating/cooling circuit 3

Energy saving function for the heating circuit pump of heating/cooling circuit 3 for weather-compensated central heating

Value 0 1

Meaning
Energy saving function off
Energy saving function on: If the outside temperature exceeds the set
room temperature selected at the HMI programming unit plus 2428.1, the circulation pump switches off. If the outside temperature falls below the set room temperature selected at the HMI programming unit plus 2428.1 ­ 1 K, the circulation pump switches back on.

2428.1 Hysteresis, economy function, outside temperature, heating/cooling circuit 3

Hysteresis for energy saving function of the heating circuit pump of heating/cooling circuit 3 for weathercompensated central heating: Energy saving function is active if 2428.0 is set to 1.

Conditions for starting and stopping the heating circuit
pump: If the outside temperature exceeds the set room
temperature selected at the HMI programming unit
plus 2428.1, the circulation pump switches off. If the outside temperature falls below the set room
temperature selected at the HMI programming unit
plus 2428.1 ­ 1 K, the circulation pump switches back on.

2429.0 Enable economy function, outside temperature, heating/cooling circuit 4

Energy saving function for the heating circuit pump of heating/cooling circuit 4 for weather-compensated central heating

Value 0 1

Meaning
Energy saving function off
Energy saving function on: If the outside temperature exceeds the set
room temperature selected at the HMI programming unit plus 2429.1, the circulation pump switches off. If the outside temperature falls below the set room temperature selected at the HMI programming unit plus 2429.1 ­ 1 K, the circulation pump switches back on.

2429.1 Hysteresis, economy function, outside temperature, heating/cooling circuit 4

Hysteresis for energy saving function of the heating circuit pump of heating/cooling circuit 4 for weathercompensated central heating: Energy saving function is active if 2429.0 is set to 1.

Conditions for starting and stopping the heating circuit
pump: If the outside temperature exceeds the set room
temperature selected at the HMI programming unit
plus 2429.1, the circulation pump switches off. If the outside temperature falls below the set room
temperature selected at the HMI programming unit
plus 2429.1 ­ 1 K, the circulation pump switches back on.

18

Parameters for heating/cooling circuits (cont.)

Parameters

2452.0 Start hysteresis, cooling, heating/cooling circuit 1

Only in conjunction with a room temperature sensor (extended cooling mode): Start hysteresis for room temperature-dependent cooling mode via heating/cooling circuit 1

If the room temperature exceeds the set room temperature by the set temperature differential, cooling is switched on.

2452.1 Stop hysteresis, cooling, heating/cooling circuit 1

Only in conjunction with a room temperature sensor (extended cooling mode): Stop hysteresis for room temperature-dependent cooling mode via heating/cooling circuit 1

If the room temperature falls below the set room temperature by the set temperature differential, cooling is switched off.

6194799
Parameter

2453.0 Start hysteresis, cooling, heating/cooling circuit 2

Only in conjunction with a room temperature sensor (extended cooling mode): Start hysteresis for room temperature-dependent cooling mode via heating/cooling circuit 2

If the room temperature exceeds the set room temperature by the set temperature differential, cooling is switched on.

2453.1 Stop hysteresis, cooling, heating/cooling circuit 2

Only in conjunction with a room temperature sensor (extended cooling mode): Stop hysteresis for room temperature-dependent cooling mode via heating/cooling circuit 2

If the room temperature falls below the set room temperature by the set temperature differential, cooling is switched off.

2498.0 Pump type, secondary pump

Manufacturer of the secondary pump: Required in order to process operating data of the circulation pump in the heat pump control unit.
Note Setting only required when replacing the circulation pump and for on-site circulation pumps

Value 0 1
2
3
4 5

Meaning Control of circulation pump via pump relay
KSB Control of circulation pump via PWM signal
Grundfos Control of circulation pump via PWM signal
Wilo Control of circulation pump via PWM signal
Do not adjust!
Do not adjust!

2499.0 Pump type, heating/cooling circuit 1
Manufacturer of the circulation pump for heating/cooling circuit 1: Required for processing operating data from the circulation pump in the heat pump control unit.
Note Setting only required when replacing the circulation pump and for on-site circulation pumps

Value 0 1
2
3
4 5

Meaning Control of circulation pump via pump relay
KSB Control of circulation pump via PWM signal
Grundfos Control of circulation pump via PWM signal
Wilo Control of circulation pump via PWM signal
Circulation pump without PWM signal
Do not adjust!

19

Parameter
6194799

Parameters Parameters for heating/cooling circuits (cont.)

2500.0 Pump type, heating/cooling circuit 2
Manufacturer of the circulation pump for heating/cooling circuit 2: Required for processing operating data from the circulation pump in the heat pump control unit.
Note Setting only required when replacing the circulation pump and for on-site circulation pumps

Value 0 1
2
3
4 5

Meaning Control of circulation pump via pump relay
KSB Control of circulation pump via PWM signal
Grundfos Control of circulation pump via PWM signal
Wilo Control of circulation pump via PWM signal
Circulation pump without PWM signal
Do not adjust!

2501.0 Pump type, heating/cooling circuit 3
Manufacturer of the circulation pump for heating/cooling circuit 3: Required for processing operating data from the circulation pump in the heat pump control unit.
Note Setting only required when replacing the circulation pump and for on-site circulation pumps

Value 0 1
2
3
4 5

Meaning Control of circulation pump via pump relay
KSB Control of circulation pump via PWM signal
Grundfos Control of circulation pump via PWM signal
Wilo Control of circulation pump via PWM signal
Circulation pump without PWM signal
Do not adjust!

2502.0 Pump type, heating/cooling circuit 4
Manufacturer of the circulation pump for heating/cooling circuit 4: Required for processing operating data from the circulation pump in the heat pump control unit.
Note Setting only required when replacing the circulation pump and for on-site circulation pumps

Value 0 1
2
3
4 5

Meaning Control of circulation pump via pump relay
KSB Control of circulation pump via PWM signal
Grundfos Control of circulation pump via PWM signal
Wilo Control of circulation pump via PWM signal
Circulation pump without PWM signal
Do not adjust!

20

6194799
Parameter

Parameters for DHW heating

Parameters

497.0 Operation of DHW circulation pump

Value 0 1
2 3 4

Meaning The DHW circulation pump runs continuously within the time program during the set time phases. The DHW circulation pump runs continuously irrespective of the set time program.
Note Continuous operation of the DHW circulation pump uses more energy.
Runtimes and pause times, each of 5 minutes duration, alternate within the set time program. The DHW circulation pump is switched on via an external button for a set duration. The DHW circulation pump operates with the cycles set in 497.3, within the set time program.

Note The respective operating status of the DHW circulation pump depends on the setting of parameters 497.0 to 497.3 and on the respective operating status of the system.
Example: Parameter 497.0 set to 0. Parameter 497.2 set to 0. A time phase is active in the time program for the
DHW circulation pump. Cylinder heating is active. The DHW circulation pump is operating in accordance with setting 497.0. However, since the cylinder is currently being heated, the DHW circulation pump is switched off.

497.1 DHW circulation pump for increased DHW hygiene

Operation of the DHW circulation pump while the function for increased DHW hygiene is active.

Value 0
1

Meaning
The DHW circulation pump runs in accordance with the set time program, irrespective of the increased DHW hygiene function.
The DHW circulation pump is switched on every time the increased DHW hygiene function is activated, irrespective of the time program for the DHW circulation pump. With this setting, the pipework can also be integrated into the increased DHW hygiene function.

Note The respective operating status of the DHW circulation pump depends on the setting of parameters 497.0 to 497.3 and on the respective operating status of the system.
Danger There is a risk of scalding at DHW temperatures above 60 °C. Limit the temperature in the DHW flow to
60 °C by means of a mixer assembly, e.g. an automatic thermostatic mixing valve (DHW cylinder accessory). Switch on scald protection: Via HMI programming unit or parameter 503.0

497.2 DHW circulation pump for DHW heating

The DHW circulation pump is operated during cylinder heating.

Value 0
1

Meaning
The DHW circulation pump is switched off during cylinder heating.
The DHW circulation pump runs in accordance with the setting in 497.0, including during cylinder heating.

Note The respective operating status of the DHW circulation pump depends on the setting of parameters 497.0 to 497.3 and on the respective operating status of the system.

21

Parameters Parameters for DHW heating (cont.)

Example: Parameter 497.0 set to 0. Parameter 497.2 set to 0. A time phase is active in the time program for the
DHW circulation pump.
Cylinder heating is active.

The DHW circulation pump is operating in accordance with setting 497.0. However, since the cylinder is currently being heated, the DHW circulation pump is switched off.

Parameter
6194799

497.3 Number of cycles DHW circulation pump

If 497.0 is set to 4, the DHW circulation pump runs within the time program at the set number of cycles per hour. 1 cycle lasts 5 min. The run cycles occur at equal intervals over the 1 hour period.
Example: Setting 497.3: 4 corresponds to 5 cycles per hour Overall runtime of DHW circulation pump per hour: 5 x 5 min = 25 min

Value 0 1 2 3 4 5

Meaning 1 cycle per h 2 cycles per h 3 cycles per h 4 cycles per h 5 cycles per h 6 cycles per h

503.0 Scald protection
Scald protection limits the cylinder temperature to max. 60 °C.

Value 0
1

Meaning
Scald protection off: DHW cylinder can be heated to the max. cylinder temperature.
Scald protection on: DHW heating stops when cylinder temperature reaches 60 °C.

Danger With scald protection switched off, a set DHW temperature higher than 60 °C can be selected. Consequently there is an increased risk of scalding! Where possible, do not switch off scald protection.

504.1 Min. set cylinder temperature Min. selectable set cylinder temperature:

Do not set this value higher than 504.3.

504.3 Max. set cylinder temperature
Max. selectable set cylinder temperature: Do not set this value lower than 504.1.
Note 874.0 cannot be set higher than this value.

Danger There is a risk of scalding at DHW temperatures above 60 °C. Limit the temperature in the DHW flow to
60 °C by means of a mixer assembly, e.g. an automatic thermostatic mixing valve (DHW cylinder accessory). Switch on scald protection: Via HMI programming unit or parameter 503.0

874.0 Set cylinder temperature for increased DHW hygiene function

At specified intervals, the hygiene function heats the cylinder temperature to this set temperature for a period of 1 h.

The interval (daily or weekly) can be set at the HMI programming unit.

22

6194799
Parameter

Parameters for DHW heating (cont.)

Parameters

Note This value cannot be set higher than the temperature set for parameter 504.3.

Danger There is a risk of scalding at DHW temperatures
above 60 °C. If possible switch on scald protection at the
HMI programming unit.

1085.0 Start hysteresis, set cylinder temperature

The set value specifies at what temperature below the current set cylinder temperature DHW heating will start.

A

C

C Cylinder temperature D DHW heating demand E DHW heating OFF F DHW heating ON

B

F

t

DE

E

Fig. 3

A Set cylinder temperature plus 1085.1 B 1085.0

1085.1 Stop hysteresis, set cylinder temperature
DHW heating ends if the set cylinder temperature selected at the HMI programming unit is exceeded by the value set here.

1087.0 Max. duration, DHW heating
DHW heating stops after expiry of the set duration, irrespective of whether the set cylinder temperature plus 1085.1 has been reached.

Note The next DHW heating period starts after expiry of duration 1087.1 at the earliest.

1087.1 Min. delay until next time DHW is heated

The next DHW heating period starts at the earliest after expiry of the delay set here.

This delay time starts at the end of every DHW heating period, irrespective of whether the set cylinder temperature plus 1085.1 has been reached. See 1087.0.

1101.2 Set speed, secondary pump for DHW heating
Set speed of the secondary pump integrated into the indoor unit, for DHW heating

23

Parameters Parameters for low-noise mode

2540.0. Low-noise mode

Value 0
1 2

Meaning
Low-noise mode is switched off. The time program for low-noise mode is not available on the HMI programming unit.
Low-noise mode can be set via the time program on the HMI programming unit.
Low-noise mode is always switched on. The time program for low-noise mode is not available on the HMI programming unit. A relevant message is shown in the HMI programming unit display.

Parameter
6194799

Parameters for electric booster heater

2340.0 Enable instantaneous heating water heater, central heating

If the heat pump cannot cover the heat demand, the instantaneous heating water heater is automatically activated for the following functions: Frost protection Increased DHW hygiene Defrost Emergency mode Screed drying
In addition, the instantaneous heating water heater can be enabled for central heating.

Required flow rates for the output stages of the instantaneous heating water heater: Stage 1: 250 l/h Stage 2: 425 l/h Stage 2: 600 l/h
Note If the flow rate in the secondary circuit is lower than the stated values, the instantaneous heating water heater is activated at a lower stage than that required on the basis of the output demand.

Value 0
1

Meaning
Instantaneous heating water heater is blocked for central heating.
Instantaneous heating water heater is enabled for central heating. The instantaneous heating water heater is switched on in addition to the heat pump if all of the following conditions apply: The heat demand exceeds the currently
available output of the heat pump. The output differential is used as the output specification for the instantaneous heating water heater. The flow rate in the secondary circuit is sufficient for operation of the instantaneous heating water heater: See the following information.

2340.1 Enable instantaneous heating water heater, DHW heating

If the heat pump cannot cover the heat demand, the instantaneous heating water heater is automatically activated for the following functions: Frost protection Increased DHW hygiene

Defrost Emergency mode Screed drying

24

6194799
Parameter

Parameters for electric booster heater (cont.)

Parameters

In addition, the instantaneous heating water heater can be enabled for DHW heating.

Value 0
1

Meaning
Instantaneous heating water heater is blocked for DHW heating.
Instantaneous heating water heater is enabled for DHW heating.

2544.0 Enable instantaneous heating water heater, power-OFF

The instantaneous heating water heater can be enabled for operation during power-OFF.

Value 0
1

Meaning
Operation of instantaneous heating water heater during power-OFF is not enabled
Operation of instantaneous heating water heater during power-OFF is enabled

2545.0 Enable instantaneous heating water heater, power-OFF via Smart Grid

The instantaneous heating water heater can be enabled for operation during power-OFF via the Smart Grid function.

Value 0
1

Meaning
Operation of the instantaneous heating water heater during power-OFF via the Smart Grid is not enabled
Operation of the instantaneous heating water heater during power-OFF via the Smart Grid is enabled

Parameters for external heat generator

2404.0 Dual mode operation, external heat generator

This parameter specifies whether the external heat generator may be switched on simultaneously with or as an alternative to the heat pump.

Value 0 1 2
3

Meaning
Do not adjust!
Mono mode operation: Heat is generated with the heat pump only. The external heat generator is not activated.
Dual mode parallel operation: If the adjusted outside temperature (long term average) falls below the dual mode temperature 2404.1 for an extended period, the external heat generator can be started in line with demand. The heat pump remains in operation.
Dual mode alternative operation: If the adjusted outside temperature (long term average) falls below the alternative operation temperature limit 2404.2 for an extended period, the external heat generator can be started in line with demand. As soon as the external heat generator starts, the heat pump switches off.

Note In most cases, dual mode parallel operation is more efficient than dual mode alternative operation. Depending on the type of heat pump, it may be cheaper to select dual mode alternative operation when outside temperatures are consistently low.

25

Parameter
6194799

Parameters Parameters for external heat generator (cont.)

2404.1 Dual mode temperature
If the adjusted outside temperature (long term average) falls below the value set here for an extended period, the external heat generator can be started in line with demand.
Requirements: The heat pump and/or other heat sources cannot
meet the current heat demand on their own. Dual mode parallel operation is selected: 2404.0 set
to 2.

Above the dual mode temperature, the external heat generator only starts under the following conditions: The heat pump fails to start due to a fault.
Or There is a special heat demand, e.g. frost protection.

2404.2 Temperature limit, alternative operation

If the adjusted outside temperature (long-term average) falls below this temperature limit, central heating and DHW heating are carried out by the external heat generator alone, even with dual mode parallel operation.

Note Set this value lower than 2404.1.

2404.3 Control strategy

The control strategy indicates the criteria under which the heat pump and/or the external heat generator are switched on for central heating and DHW heating.

Value 0 1
2

Meaning
Hybrid operation is switched off.
Operation with fixed temperature limits as per Fig. 4: Temperature limit for alternative operation:
See 2404.1. Dual mode point: See 2404.2
Economical operating mode:

The following factors are taken into account when calculating the start points for the heat pump and/or external heat generator: Heat pump COP Energy prices for electricity and fossil fuels

Note The energy prices are set in the ViCare app. The control strategy cannot be used without the energy prices.

3

Ecological operating mode:

The following factors are taken into account when calculating the start points for the heat pump and/or external heat generator: Heat pump COP Primary energy factors for electricity and
fossil fuels

Value

Meaning Note The primary energy factors are preset. The primary energy factors can be adjusted in the ViCare app.

Note In case of high heat demand, the heat sources can also be switched on outside the respective operating range, e.g. for frost protection of a system component or to defrost the evaporator.
Operation with fixed temperature limits: Dual mode parallel operation

A

B

A

Fig. 4

A Outside temperature A Temperature limit, alternative operation 2404.2 B Dual mode temperature 2404.1
The heat pump is switched on for room heating/ room cooling and DHW heating as required. The external heat generator is switched on for central heating and DHW heating as required.

26

6194799
Parameter

Parameters for external heat generator (cont.)

Parameters

2626.0 Max. output, electric booster heater
Set the maximum heating output of the instantaneous heating water heater in kW, e.g. 3 for 3 kW.

2796.0 Enable external heat generator, central heating

The external heat generator can be enabled for heating mode. If the heat pump cannot cover the heat demand from the heating circuits, the external heat generator is started. If the boiler water temperature is sufficiently high, the boiler water will be supplied to the heating circuits via the mixer for external heat generators (downstream of the buffer cylinder). This mixer regulates to the set flow temperature of the system.

Value 0
1

Meaning
External heat generator is blocked for central heating.
External heat generator is enabled for central heating.

Other conditions for central heating with an external heat generator: The dual mode temperature is not reached.
Or There is a special heat demand, e.g. frost protection
of a system component.

2796.1 Enable external heat generator, DHW heating

The external heat generator can be enabled for DHW heating. If the heat pump cannot cover the heat demand from the DHW cylinder, the circulation pump for DHW reheating and the external heat generator will be activated.

Value 0
1

Meaning
External heat generator is blocked for DHW heating.
External heat generator is enabled for DHW heating.

2796.2 Enable external heat generator, DHW heating emergency mode

The external heat generator can be enabled for DHW heating emergency mode. In emergency mode, the outdoor unit is switched off.

Value 0
1

Meaning
External heat generator is blocked for DHW heating in emergency mode.
External heat generator is enabled for DHW heating in emergency mode.

2796.3 Enable external heat generator, central heating emergency mode

The external heat generator can be enabled for central heating emergency mode. In emergency mode, the outdoor unit is switched off.

Value 0
1

Meaning
External heat generator is blocked for central heating in emergency mode.
External heat generator is enabled for central heating in emergency mode.

27

Parameters Parameters for external heat generator (cont.)

2796.4 Enable external heat generator, screed drying

The external heat generator can be enabled for screed drying: If the heat pump has not yet been commissioned. For back-up if the indoor unit is being operated with-
out the outdoor unit.

Value 0
1

Meaning
External heat generator is blocked for screed drying.
External heat generator is enabled for screed drying.

Parameter
6194799

2796.5 Enable external heat generator, defrosting

The external heat generator can be enabled for defrosting. If the heat pump cannot cover the heat demand for defrosting, the external heat generator is started.

Value 0
1

Meaning
External heat generator is blocked for defrosting.
External heat generator is enabled for defrosting.

2796.6 Enable external heat generator for increased DHW hygiene function

The external heat generator can be enabled for the increased DHW hygiene function: If the heat pump has not yet been commissioned. For back-up if the heat generated by the heat pump
is not sufficient.

Value 0
1

Meaning
External heat generator is blocked for the increased DHW hygiene function.
External heat generator is enabled for the increased DHW hygiene function.

2796.7 Enable external heat generator, frost protection

The external heat generator can be enabled for frost protection. If the heat pump cannot cover the heat demand necessary to ensure that the system is protected from frost, the external heat generator is started.

Value 0
1

Meaning
External heat generator is blocked for frost protection.
External heat generator is enabled for frost protection.

2796.8 Configuration, external heat generator Do not adjust!

2853.0 Start threshold, external heat generator

To prevent the external heat generator starting immediately if the set flow temperature in the secondary circuit is not reached for a short time, the control unit uses the output integral as start criteria. This output integral is the integral from duration and extent of the deviation of the set flow temperature to the actual value. In Fig. 5, the output integral is the grey area between the time line of the actual value and the hysteresis of the flow temperature secondary circuit.

C Fig. 5

A DB
t

A Secondary circuit set flow temperature B Secondary circuit flow temperature actual value C Hysteresis, flow temperature secondary circuit D Output integral
28

6194799
Parameter

Parameters for external heat generator (cont.)
2940.0 Start delay, external heat generator
The external heat generator does not start within the specified period following a change of the set flow temperature in the secondary circuit. This may occur for example during a change in operating status in the time program for central heating or following a changeover between central heating and DHW heating.
2940.1 Min. runtime, external heat generator
Following a demand, the heat pump control unit will not switch off the external heat generator within this time.
2940.2 Stop delay, external heat generator
When the demand for the external heat generator is no longer present, the external heat generator initially remains on. The external heat generator is switched off once the system flow temperature has reached the set value for the duration set here.

Parameters

Parameters for Smart Grid

2543.0 Smart Grid room temperature set value increase, heating

If the function for increasing set temperatures is active via Smart Grid, the current set room temperature is raised by this value. The current set room temperature depends on the active operating status in the central heating time program.

Requirement: Central heating is switched on.

2543.1 Smart Grid room temperature set value increase, cooling

If the function for increasing set temperatures is active via Smart Grid, the current set room temperature is raised by this value. The current set room temperature depends on the active operating status in the room cooling time program.

Requirement: Room cooling is switched on.

2543.2 Smart Grid set value increase for DHW heating
If the function for increasing set temperatures is active via Smart Grid, the set DHW temperature is raised by this value.

2543.3 Smart Grid set value increase for heating water buffer cylinder
If the function for increasing set temperatures is active via Smart Grid, the current set temperature for the buffer cylinder is raised by this value.

29

Parameters Parameters for Smart Grid (cont.)

2560.0 Power-OFF/Smart Grid selection
The power supply utility can block or specifically issue a demand for the compressor via Smart Grid. This requires 2 floating contacts of the power supply utility to be connected to the digital inputs of the heat pump.

Value 0 1

Meaning Only power-OFF Smart Grid including power-OFF

Parameter
6194799

30

Fault messages

Fault and warning messages, Vitocal 200-S/222-S

Note The possible faults vary according to the system

!

equipment. Therefore, not all fault messages will come

up for every system.

!

Please note Refrigerant can escape when working on the

refrigerant circuit.

It is essential that regulations and guidelines

on handling refrigerant are always observed

and adhered to: See “Safety information”.

Work on the refrigerant circuit must only be

carried out by a certified contractor (in accord-

ance with Regulations (EU) No 517/2014 and

2015/2067).

Specialist personnel working on a refrigerant

circuit with flammable refrigerant are required

to have specific qualifications and certification:

See “Safety information”.

Please note Repairing components that fulfil a safety function can compromise the safe operation of the system. Do not undertake any repairs on the inverter.
Replace the inverter if there is a defect. Replace faulty components only with genuine
Viessmann spare parts.

Message code F.1

System characteristics
The heat pump is switched off.

F.2

The heat pump is switched

off.

F.3

No defrost

No room cooling

F.4

No defrost

No room cooling

F.7

Only room heating

No DHW heating

Cause

Measures

Lead break, flow tempera- Check resistance value

ture sensor, secondary cir- (NTC 10 k) at connec-

cuit or heating/cooling cir- tion X4.1/X4.2 of the EHCU elec-

cuit 1

tronics module. Replace sensor if

necessary.

Short circuit, flow temperature sensor, secondary circuit or heating/cooling circuit 1

Check resistance value (NTC 10 k) at connection X4.1/X4.2 of the EHCU electronics module. Replace sensor if necessary.

Lead break, secondary circuit return temperature sensor

Check resistance value (NTC 10 k) at connection X4.3/X4.4 of the EHCU electronics module. Replace sensor if necessary.

Short circuit, secondary circuit return temperature sensor

Check resistance value (NTC 10 k) at connection X4.3/X4.4 of the EHCU electronics module. Replace sensor if necessary.

Lead break, cylinder temperature sensor

Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 9 and 10. Floorstanding indoor unit: Connection at plug 5 on the HPMU electronics module

6194799

31

Fault and warning messages, Vitocal 200-S/222-S Fault messages (cont.)

Message code F.8
F.13
F.14
F.23 F.24 F.33 F.34

System characteristics Only room heating No DHW heating
An outside temperature value of 0 °C is used to calculate the set flow temperature.
An outside temperature value of 0 °C is used to calculate the set flow temperature.
Charging of cylinder loading system not possible Charging of cylinder loading system not possible Refrigerant circuit off
Refrigerant circuit off

Cause Short circuit, cylinder temperature sensor
Lead break, outside temperature sensor
Short circuit, outside temperature sensor
Lead break, centre buffer temperature sensor Short circuit, centre buffer temperature sensor Lead break, air inlet temperature sensor OAT
Short circuit, air inlet temperature sensor OAT

Measures
Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 9 and 10. Floorstanding indoor unit: Connection at plug 5 on the HPMU electronics module
Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 11 and 12. Floorstanding indoor unit: Connection at luster terminals for sensors, terminal 5 and 6
Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 11 and 12. Floorstanding indoor unit: Connection at luster terminals for sensors, terminal 5 and 6
Check resistance value (NTC 10 k) at connection. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X16.3/X16.4 of the refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X16.3/X16.4 of the refrigerant circuit controller. Replace sensor if necessary.

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Fault messages (cont.)

Fault and warning messages, Vitocal 200-S/222-S

Message code F.74

System characteristics
The heat pump is switched off.

Cause

Measures

Hydraulic system pressure Top up with water.

too low

Vent the system.

If the fault occurs repeatedly: Check system pressure sensor
with external pressure gauge. Check the pre-charge pressure
of the expansion vessel. Check settings for set system
pressure and range.

F.75

The heat pump is switched No flow in the secondary Check secondary pump//heating

off.

circuit, or flow sensor faul- circuit pump, heating/cooling cir-

ty

cuit 1. Replace secondary

pump//heating circuit pump,

heating/cooling circuit 1 if re-

quired.

Check flow sensor. Replace flow

sensor if required.

F.78

HMI programming unit is

No communication with Check the power supply. Restore

dark. No communication be- programming unit

if necessary.

tween HMI programming unit

Check connection to HMI elec-

and HPMU electronics mod-

tronics module.

ule

Suppress electromagnetic inter-

ference on bus connections.

Replace HMI programming unit.

F.87

The safety valve in the indoor Hydraulic system pressure Reduce the system pressure.

unit has opened.

too high

F.91

Function of connected com- DIO electronics module Check the settings in the com-

ponents in emergency mode communication error

missioning assistant. Adjust set-

tings if required.

Check connections to DIO elec-

tronics module and connection to

HPMU electronics module.

Check whether components are

wrongly connected.

Isolate the system from the pow-

er supply. Restart the system.

If the fault persists, replace

DIO electronics module.

F.92

Function of connected com- ADIO electronics module Check the settings in the com-

ponents in emergency mode communication error

missioning assistant. Adjust set-

tings if required.

Check connections on

ADIO electronics module.

Check whether components are

wrongly connected.

Isolate the system from the pow-

er supply. Restart the system.

If the fault persists, replace

ADIO electronics module.

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33

Fault and warning messages, Vitocal 200-S/222-S Fault messages (cont.)

Message code F.94 F.100
F.101
F.102 F.104

System characteristics Function of the relevant electronics module in emergency mode
Function of the electronics modules connected to PlusBus not available
Function of the electronics modules connected to PlusBus not available
No WiFi Depending on configuration of EM-EA1 extension (DIO electronics module)

Cause SDIO electronics module communication error
PlusBus voltage error
Short circuit, PlusBus
Communication error, WiFi communication module External fault message input active

Measures
Check the settings in the commissioning assistant. Adjust settings if required.
Check connections on SDIO electronics module.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace SDIO electronics module.
Check PlusBus power supply at HPMU electronics module: Isolate all PlusBus components connected. Reconnect each one in turn.
Check connections at plug 74 of the HPMU electronics module.
Wall mounted indoor unit: Check the connections at plug 74 on the connection socket on the underside of the appliance.
Check whether there is a short circuit at the PlusBus cables.
Isolate the system from the power supply. Restart the system. If the fault persists, replace HPMU electronics module.
Check PlusBus power supply at HPMU electronics module: Isolate all PlusBus components connected. Reconnect each one in turn.
Check connections at plug 74 of the HPMU electronics module.
Wall mounted indoor unit: Check the connections at plug 74 on the connection socket on the underside of the appliance.
Check whether there is a short circuit at the PlusBus cables.
Isolate the system from the power supply. Restart the system. If the fault persists, replace HPMU electronics module.
Replace the WiFi communication module.
Check the settings in the commissioning assistant for fault message input. Adjust settings if required.
Check connected external appliance.

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34

Fault messages (cont.)

Fault and warning messages, Vitocal 200-S/222-S

Message code System characteristics

F.111

Refrigerant circuit off

F.112

Refrigerant circuit off

F.123

Refrigerant circuit off

F.124

Refrigerant circuit off

F.151

Refrigerant circuit off

F.152

Refrigerant circuit off

F.160

Communication error, electronics module

F.425 F.430 F.431

Values in energy cockpit incorrect
Operation with internal set value specifications of the heat pump control unit
Operation with internal set value specifications of the heat pump control unit

Cause Lead break, evaporator refrigerant inlet temperature sensor OCT
Short circuit, evaporator refrigerant inlet temperature sensor OCT
Lead break, liquid gas temperature sensor IRT
Short circuit, liquid gas temperature sensor IRT
Lead break, hot gas temperature sensor CTT
Short circuit, hot gas temperature sensor CTT
Affected electronics module incorrectly connected
Time synchronisation not possible
Communication error, gateway
KNX/TP gateway communication error

Measures
Check resistance value (NTC 10 k) at connection X21.1/X21.2 of the refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X21.1/X21.2 of the refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X2.3/X2.4 of the EHCU electronics module. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X2.3/X2.4 of the EHCU electronics module. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X14.9/X14.10 of the refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X14.9/X14.10 of the refrigerant circuit controller. Replace sensor if necessary.
Check the CAN bus cable. Check the CAN bus subscriber
numbers. Isolate the system from the pow-
er supply. Restart the system. If the fault persists, replace the CAN bus cables. Replace the electronics modules if required.
Replace CR2032 battery in HPMU electronics module.
Set the time on the programming unit: See operating instructions.
Check connections and connecting cable to the gateway. Replace cable if required.
Check power supply to the gateway.
Check connections and connecting cable to the gateway. Replace cable if required.
Check power supply to KNX/TP gateway.

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35

Fault and warning messages, Vitocal 200-S/222-S Fault messages (cont.)

Message code F.454 F.472
F.518 F.519 F.542
F.543

System characteristics The refrigerant circuit is locked.
No communication with energy meter
Cannot use wireless remote control Operation with internal set value specifications of the heat pump control unit Mixer closes. Heating circuit pump is operational.
Mixer closes. Heating circuit pump is operational.

Cause

Measures

Incorrect version of oper- Check version of operating soft-

ating software for the elec- ware for HPMU and EHCU elec-

tronics modules

tronics modules and for refriger-

ant circuit controller.

Install correct software version if

required.

Communication error, energy meter

Check the settings in the commissioning assistant. Adjust settings if required.
Check the connections to the HPMU electronics module.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace HPMU electronics module.

Communication error, wireless remote control

Range to receiver exceeded Check power supply of transmit-
ter. Notify contractor.

BACnet/IP gateway communication error

Check connections and connecting cable to the gateway. Replace cable if required.
Check power supply to BACnet/IP gateway.

Lead break, flow temperature sensor, heating/cooling circuit 1 with mixer Or Wrong setting during commissioning

Check the settings in the commissioning assistant. Adjust settings if required.
Check setting of rotary switch S1 on ADIO electronics module.
Check flow temperature sensor in heating/cooling circuit 1.
Check resistance value (NTC 10 k) at the sensor input on ADIO electronics module. Replace sensor if necessary.

Short circuit, flow temper- Check the settings in the com-

ature sensor, heating/cool- missioning assistant. Adjust set-

ing circuit 1 with mixer

tings if required.

Check setting of rotary switch S1

on ADIO electronics module.

Check flow temperature sensor

in heating/cooling circuit 1.

Check resistance value

(NTC 10 k) at the sensor input

on ADIO electronics module. Re-

place sensor if necessary.

6194799

36

Fault messages (cont.)

Fault and warning messages, Vitocal 200-S/222-S

Message code F.544

System characteristics
Mixer closes. Heating circuit pump is operational.

F.545

Mixer closes. Heating circuit pump is operational.

F.546

Mixer closes. Heating circuit pump is operational.

F.547

Mixer closes. Heating circuit pump is operational.

F.548

Mixer closes. Heating circuit pump is operational.

Cause

Measures

Lead break, flow temperature sensor, heating/cooling circuit 2 with mixer Or Wrong setting during commissioning

Check the settings in the commissioning assistant. Adjust settings if required.
Check setting of rotary switch S1 on ADIO electronics module.
Check flow temperature sensor in heating/cooling circuit 2.
Check resistance value (NTC 10 k) at the sensor input on ADIO electronics module. Replace sensor if necessary.

Short circuit, flow temper- Check the settings in the com-

ature sensor, heating/cool- missioning assistant. Adjust set-

ing circuit 2 with mixer

tings if required.

Check setting of rotary switch S1

on ADIO electronics module.

Check flow temperature sensor

in heating/cooling circuit 2.

Check resistance value

(NTC 10 k) at the sensor input

on ADIO electronics module. Re-

place sensor if necessary.

Lead break, flow temperature sensor, heating/cooling circuit 3 with mixer Or Wrong setting during commissioning

Check the settings in the commissioning assistant. Adjust settings if required.
Check setting of rotary switch on ADIO electronics module.
Check flow temperature sensor in heating/cooling circuit 3.
Check resistance value (NTC 10 k) at the sensor input on ADIO electronics module. Replace sensor if necessary.

Short circuit, flow temper- Check the settings in the com-

ature sensor, heating/cool- missioning assistant. Adjust set-

ing circuit 3 with mixer

tings if required.

Check setting of rotary switch on

ADIO electronics module.

Check flow temperature sensor

in heating/cooling circuit 3.

Check resistance value

(NTC 10 k) at the sensor input

on ADIO electronics module. Re-

place sensor if necessary.

Lead break, flow temperature sensor, heating/cooling circuit 4 with mixer Or Wrong setting during commissioning

Check the settings in the commissioning assistant. Adjust settings if required.
Check setting of rotary switch on ADIO electronics module.
Check flow temperature sensor in heating/cooling circuit 4.
Check resistance value (NTC 10 k) at the sensor input on ADIO electronics module. Replace sensor if necessary.

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37

Fault and warning messages, Vitocal 200-S/222-S Fault messages (cont.)

Message code F.549

System characteristics
Mixer closes. Heating circuit pump is operational.

F.575 F.576 F.578 F.579 F.581 F.582 F.584 F.585

Normal operation without room temperature influence
Normal operation without room temperature influence
Normal operation without room temperature influence
Normal operation without room temperature influence
Normal operation without room temperature influence
Normal operation without room temperature influence
Normal operation without room temperature influence
Normal operation without room temperature influence

Cause

Measures

Short circuit, flow temper- Check the settings in the com-

ature sensor, heating/cool- missioning assistant. Adjust set-

ing circuit 4 with mixer

tings if required.

Check setting of rotary switch on

ADIO electronics module.

Check flow temperature sensor

in heating/cooling circuit 4.

Check resistance value

(NTC 10 k) at the sensor input

on ADIO electronics module. Re-

place sensor if necessary.

Lead break, room temper- Check external room tempera-

ature sensor, heating/cool- ture sensor in heating/cooling cir-

ing circuit 1

cuit.

Check room temperature sensor

at the remote control.

Short circuit, room temperature sensor, heating/ cooling circuit 1

Check external room temperature sensor in heating/cooling circuit.
Check room temperature sensor at the remote control.

Lead break, room temper- Check external room tempera-

ature sensor, heating/cool- ture sensor in heating/cooling cir-

ing circuit 2

cuit.

Check room temperature sensor

at the remote control.

Short circuit, room temperature sensor, heating/ cooling circuit 2

Check external room temperature sensor in heating/cooling circuit.
Check room temperature sensor on remote control.

Lead break, room temper- Check external room tempera-

ature sensor, heating/cool- ture sensor in heating/cooling cir-

ing circuit 3

cuit.

Check room temperature sensor

at the remote control.

Short circuit, room temperature sensor, heating/ cooling circuit 3

Check external room temperature sensor in heating/cooling circuit.
Check room temperature sensor at the remote control.

Lead break, room temper- Check external room tempera-

ature sensor, heating/cool- ture sensor in heating/cooling cir-

ing circuit 4

cuit.

Check room temperature sensor

at the remote control.

Short circuit, room temperature sensor, heating/ cooling circuit 4

Check external room temperature sensor in heating/cooling circuit.
Check room temperature sensor at the remote control.

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Fault messages (cont.)

Fault and warning messages, Vitocal 200-S/222-S

Message code F.685
F.686
F.687
F.770 F.771 F.788 F.790

System characteristics

Cause

Measures

Function of connected com- HPMU electronics module

ponents in emergency

communication error

mode

Frost protection enabled

Passive frost protection on

EHCU electronics module

Check connections on HPMU electronics module and on faulty control unit.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace HPMU electronics module.

The refrigerant circuit will not start.

Refrigerant circuit controller communication error

Check the settings in the commissioning assistant. Adjust settings if required.
Check connections on refrigerant circuit controller.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If fault persists, replace refrigerant circuit controller.

The heat pump is switched off.
No function of connected components

EHCU electronics module communication error

Check connections on HPMU electronics module and on faulty control unit.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace the EHCU electronics module.

Refrigerant circuit off

Lead break, flow tempera- Check resistance value ture sensor, secondary cir- (NTC 10 k) at conneccuit downstream of con- tion X2.1/X2.2 of the EHCU elecdenser or heating/cooling tronics module. Replace sensor if circuit 1 downstream of necessary. condenser

Refrigerant circuit off

Short circuit, flow temperature sensor, secondary circuit downstream of condenser or heating/cooling circuit 1 downstream of condenser

Check resistance value (NTC 10 k) at connection X2.1/X2.2 of the EHCU electronics module. Replace sensor if necessary.

No room heating/cooling No DHW heating

Fault, control and/or power supply of 4/3-way valve

Check connections on motor of 4/3-way valve.
Check motor of 4/3-way valve. Replace motor if necessary.

No room heating/cooling No DHW heating

Motor of 4/3-way valve not correctly mounted
4/3-way valve faulty

Check mounting of motor: See separate installation instructions.
Check hydraulic and electrical connections of 4/3-way valve.
Check motor of 4/3-way valve. Replace motor and/or 4/3-way
valve if required.

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Fault and warning messages, Vitocal 200-S/222-S Fault messages (cont.)

Message code F.791
F.792
F.793
F.797 F.798 F.799 F.800 F.801

System characteristics Reduced output, instantaneous heating water heater
Reduced output, instantaneous heating water heater
Reduced output, instantaneous heating water heater
Secondary pump/heating circuit pump, heating/cooling circuit 1 is off. No room heating, heating/
cooling circuit 1 No DHW heating Heating circuit pump, heating/cooling circuit 2 is off. No room heating, heating/
cooling circuit 2 No DHW heating Secondary pump/heating circuit pump, heating/cooling circuit 1 is off. No room heating, heating/
cooling circuit 1 No DHW heating Heating circuit pump, heating/cooling circuit 2 is off. No room heating, heating/
cooling circuit 2 No DHW heating Fault, outdoor unit, no refrigerant circuit reversal

Cause

Measures

Phase L1 in power supply of instantaneous heating water heater not present

Check fuse for instantaneous heating water heater.
Check power supply on instantaneous heating water heater and on connections of indoor unit.
Check power cables. Check instantaneous heating wa-
ter heater. Replace if required.

Phase L2 in power supply of instantaneous heating water heater not present

Check fuse for instantaneous heating water heater.
Check power supply on instantaneous heating water heater and on connections of indoor unit.
Check power cables. Check instantaneous heating wa-
ter heater. Replace if required.

Phase L3 in power supply of instantaneous heating water heater not present

Check fuse for instantaneous heating water heater.
Check power supply on instantaneous heating water heater and on connections of indoor unit.
Check power cables. Check instantaneous heating wa-
ter heater. Replace if required.

Secondary pump/heating Isolate the system from the power

circuit pump, heating/cool- supply. Restart the system.

ing circuit 1 is faulty

If the fault persists, replace secon-

dary pump/heating circuit pump,

heating/cooling circuit 1.

Heating circuit pump, heating/cooling circuit 2 is faulty

Isolate the system from the power supply. Restart the system. If the fault persists, replace heating circuit pump, heating/cooling circuit 2.

Secondary pump/heating Isolate the system from the power

circuit pump, heating/cool- supply. Restart the system.

ing circuit 1 is faulty

If the fault persists, replace secon-

dary pump/heating circuit pump,

heating/cooling circuit 1.

Heating circuit pump, heating/cooling circuit 2 is faulty
4-way diverter valve faulty

Isolate the system from the power supply. Restart the system. If the fault persists, replace heating circuit pump, heating/cooling circuit 2.
Check connections on refrigerant circuit controller.
Check 4-way diverter valve (function check). Replace coil if required.
Isolate the system from the power supply. Restart the system. If the fault persists, replace the 4way diverter valve.

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40

Fault messages (cont.)

Fault and warning messages, Vitocal 200-S/222-S

Message code F.807
F.808
F.830 F.831 F.837
F.843 F.862 F.864 F.875 F.876 F.877 F.878 F.881

System characteristics The refrigerant circuit will not start.
The refrigerant circuit will not start.
Refrigerant circuit off: Inverter and compressor cannot be switched on.
Refrigerant circuit off: Inverter and compressor cannot be switched on.
Refrigerant circuit off: Inverter and compressor cannot be switched on.
Refrigerant circuit off: Inverter and compressor cannot be switched on.
Heat pump output demand not possible, compressor not available No defrost Compressor cannot be
switched on. Communication between lag appliance and lead appliance interrupted The heat pump is switched off. Refrigerant circuit off
Refrigerant circuit off
The refrigerant circuit will not start.

Cause Fan not running.
Fan not running.
Power supply on inverter faulty
Power supply on inverter faulty
Power supply on compressor faulty
Overvoltage shutdown, inverter
Internal fault, inverter
Outdoor unit defrost attempt unsuccessful Communication error with lead appliance Lead break, flow sensor Short circuit, evaporator temperature sensor OMT
Lead break, evaporator temperature sensor OMT
Refrigerant circuit safety shutdown

Measures
Check connections on refrigerant circuit controller.
Check fan can rotate freely. Check fan with actuator test. Isolate the system from the pow-
er supply. Restart the system. If fault persists, replace fan.
Check connections on refrigerant circuit controller.
Check fan can rotate freely. Check fan with actuator test. Isolate the system from the pow-
er supply. Restart the system. If fault persists, replace fan.
Isolate the system from the power supply. Restart the system. If the fault persists, replace the inverter.
Isolate the system from the power supply. Restart the system. If the fault persists, replace the inverter.
Check the electrical connection between inverter and compressor.
If the fault persists, replace the inverter.
Isolate the system from the power supply. Restart the system. If the fault persists, replace the inverter.
Replace inverter.
Check outdoor unit for icing up. De-ice if necessary.
Check for short circuit or interchanged CAN bus connections.
Check flow sensor. Replace flow sensor if required.
Check resistance value (NTC 10 k) at connection of refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection of refrigerant circuit controller. Replace sensor if necessary.
Isolate the system from the power supply. Restart the system. If the fault persists, replace the inverter.

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41

Fault and warning messages, Vitocal 200-S/222-S Fault messages (cont.)

Message code F.906 F.914 F.915 F.916 F.982 F.990
F.991
F.992
F.993
F.994

System characteristics Heat pump not available
Heat pump does not start. Heat pump does not start.
Heat pump does not start.
Heat pump does not start.

Cause
Output discrepancies between outdoor and indoor unit
Inverter temperature too high
Short circuit, temperature sensor, inverter cooling HST
Lead break, temperature sensor, inverter cooling HST
Heating circuit pump running dry

Secondary circuit not control- Short circuit, temperature

led

sensor

Secondary circuit not control- Lead break, temperature

led

sensor

No heating/cooling of exter- Short circuit, temperature

nal heating water/coolant buf- sensor of external heating

fer cylinder

water/coolant buffer cylin-

der

No heating of external heating water/coolant buffer cylinder

Lead break, temperature sensor of external heating water/coolant buffer cylinder

No heating of external heating water buffer cylinder

Short circuit, temperature sensor of external heating water buffer cylinder

Measures
Check outputs of indoor unit and outdoor unit. Replace units if necessary.
Check temperatures of air supply for inverter cooling.
Replace temperature sensor, inverter cooling HST or refrigerant circuit controller.
Replace temperature sensor, inverter cooling HST or refrigerant circuit controller.
Check shut-off valve. Check heating circuit pump con-
nection. Fill system.
Check the settings in the commissioning assistant. Adjust settings if required.
Check resistance value (NTC 10 k) at connection X17 of the EHCU electronics module. Replace sensor if necessary.
Check the settings in the commissioning assistant. Adjust settings if required.
Check resistance value (NTC 10 k) at connection X17 of the EHCU electronics module. Replace sensor if necessary.
Check the settings in the commissioning assistant. Adjust settings if required.
Check resistance value (NTC 10 k) at connection X17 of the EHCU electronics module. Replace sensor if necessary.
Check the settings in the commissioning assistant. Adjust settings if required.
Check resistance value (NTC 10 k) at connection X17 of the EHCU electronics module. Replace sensor if necessary.
Check the settings in the commissioning assistant. Adjust settings if required.
Check resistance value (NTC 10 k) at connection X17.1/X17.2 of the EHCU electronics module. Replace sensor if necessary.

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42

Fault messages (cont.)

Fault and warning messages, Vitocal 200-S/222-S

Message code F.995 F.996 F.997 F.998
F.999

System characteristics
No heating of external heating water buffer cylinder

Cause
Lead break, temperature sensor of external heating water buffer cylinder

No cooling of external coolant Short circuit, temperature

buffer cylinder

sensor of external coolant

buffer cylinder

No cooling of external coolant Lead break, temperature

buffer cylinder

sensor of external coolant

buffer cylinder

The refrigerant circuit will not Flow rate signal faulty start.

Operation of connected elec- HIO electronics module tronics modules not possible. communication error

Measures
Check the settings in the commissioning assistant. Adjust settings if required.
Check resistance value (NTC 10 k) at connection X17.1/X17.2 of the EHCU electronics module. Replace sensor if necessary.
Check the settings in the commissioning assistant. Adjust settings if required.
Check resistance value (NTC 10 k) at connection X17 of the EHCU electronics module. Replace sensor if necessary.
Check the settings in the commissioning assistant. Adjust settings if required.
Check resistance value (NTC 10 k) at connection X17 of the EHCU electronics module. Replace sensor if necessary.
Check flow sensor. Replace if required.
Check CAN bus connections: ­ CAN bus cable, indoor/outdoor unit ­ Check connection X19 on EHCU electronics module. ­ Check connections X4 on HPMU electronics module. ­ Check connection X5 on EHCU electronics module.
Isolate the system from the power supply. Restart the system. If the fault persists, replace the CAN bus cable. Replace EHCU electronics module if required. Replace HPMU electronics module if required.
If fault occurs repeatedly, replace refrigerant circuit controller, internal CAN bus and EHCU electronics module.
Check settings in the commissioning assistant.
Check plug for secure seating and corrosion.
Check that appliance connections are correct.
Check power supply of HIO electronics module.
After a system power reset, check whether the fault re-occurs.
If the fault re-occurs, replace affected control unit.

43

6194799

Fault and warning messages, Vitocal 200-S/222-S Fault messages (cont.)

Message code F.1008 F.1010
F.1013 F.1014 F.1015 F.1016 F.1017
F.1018 F.1019 F.1022 F.1034
F.1035
F.1045

System characteristics

Cause

Most recently connected con- Number of connected lag

trol unit not recognised.

appliances has been ex-

ceeded.

Refrigerant circuit off

Fault, pressure sensor

Heat pump off
Heating water stays cold. Outdoor unit not recognised. Heat pump does not start.
Outdoor unit off

DIP switch on refrigerant circuit controller is not set correctly
DIP switch on refrigerant circuit controller is not set correctly
DIP switch on refrigerant circuit controller is not set correctly
Return temperature sensor not recognised.

Outdoor unit off

Flow temperature sensor, secondary circuit or heating/cooling circuit 1 not recognised.

Outdoor unit off

High pressure sensor ICT not recognised.

Outdoor unit off
Electricity meter registers a fault, no functional support. Communication error between the control units connected via external CAN bus

Liquid gas temperature sensor IRT not recognised.
Electricity meter registers a fault.
Communication fault, external CAN bus

Communication error between the control units connected via internal CAN bus

Communication fault, internal CAN bus

External heat generator not Fault on external heat

ready for operation

generator

Measures In the system configuration, check the number of connected control units. To check the sensor, measure the voltage at the sensor or at connection X11 of the EHCU electronics module (0 to 5 V). Replace sensor if necessary. Set DIP switch correctly.
Set DIP switch correctly.
Set DIP switch correctly.
Check return temperature sensor. Replace if necessary or replace EHCU electronics module. Check flow temperature sensor, secondary circuit or heating/cooling circuit 1. Replace if necessary or replace EHCU electronics module. Check high pressure sensor ICT. Replace if necessary or replace EHCU electronics module. Check liquid gas temperature sensor IRT. Replace if necessary or replace EHCU electronics module. Check fault memory on electricity meter. Check for short circuit on external CAN bus or for interchanged connections (CAN-H and CAN-L) on plug 91 (X8). Check for short circuit on internal CAN bus or for interchanged connections (CAN-H and CAN-L) on plugs X4, X5. Check fault message on control unit of external heat generator. Remedy the fault.

Installation and service instructions for external heat generator and associated control unit

F.1050

Uncontrolled operation of the external heat generator

Short circuit, boiler water Check resistance value

temperature sensor, exter- (NTC 10 k) at connection TS2 of

nal heat generator

the HIO electronics module. Re-

place sensor if necessary.

6194799

44

Fault messages (cont.)

Fault and warning messages, Vitocal 200-S/222-S

Message code F.1051
F.1054

System characteristics Uncontrolled operation of the external heat generator
External heat generator not ready for operation

Cause

Measures

Lead break, boiler water Check resistance value

temperature sensor, exter- (NTC 10 k) at connection TS2 of

nal heat generator

the HIO electronics module. Re-

place sensor if necessary.

Max. temperature of exter- Check the cause of exceeding the

nal heat generator excee- max. temperature at the external

ded

heat generator. Remedy any fault.

Installation and service instructions for external heat generator and associated control unit

F.1057
F.1062 F.1063 F.1064 F.1065 F.1066 F.1067 F.1069 F.1078
F.1079
F.1080
F.1081

Refrigerant circuit off
Heat pump not operational Heat pump not operational Heat pump not operational Heat pump not operational Heat pump not operational Heat pump not operational Heat pump off Refrigerant circuit off
Refrigerant circuit off
Refrigerant circuit off
Refrigerant circuit off

Fault, high pressure sensor
Inverter voltage too low Inverter voltage too high Overcurrent at inverter Power supply too low Power supply too high Power supply frequency too high Condenser overheating
Flow rate repeatedly too low
Defrosting fault due to low flow rate
Evaporation temperature in cooling circuit too low
Flow temperature of secondary circuit or heating/ cooling circuit 1 too low

Check power supply (5 V) at connection X20.1/X20.3 of the EHCU electronics module.
Check signal (0 to 5 V) at connection X20.2 of the EHCU electronics module. Replace sensor if necessary.
Check and ensure inverter power supply. Restart outdoor unit.
Check and ensure inverter power supply. Restart outdoor unit.
Restart outdoor unit.
Check and ensure power supply. Restart outdoor unit.
Check and ensure power supply. Restart outdoor unit.
Check and ensure power supply. Restart outdoor unit.
Check supply flow rate. Clean condenser in outdoor unit.
Replace if required.
Perform one-off DHW heating. Deactivate cooling mode. Increase secondary temperature
via external heat generator.
Check flow rate in hydraulic circuit.
Check actuation of heating circuit pump with actuator test.
Check system flow rate. Check shut-off valves.
Check flow rate. Check refrigerant lines for leaks. Check cooling circuit for possible
blockages.
Check flow rate. Check refrigerant lines for leaks. Check cooling circuit for possible
blockages.

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Fault and warning messages, Vitocal 200-S/222-S Fault messages (cont.)

Message code System characteristics

F.1082

Refrigerant circuit off

F.1083 F.1085 F.1086 F.1087
F.1088 F.1089 F.1090 F.1091 F.1092 F.1093

Refrigerant circuit off
DHW cylinder system does not supply any water. No DHW circulation DHW cylinder system does not supply any water. No DHW circulation DHW cylinder system does not supply any water. No DHW circulation
DHW heating off
DHW heating off
DHW heating off
DHW heating off
Refrigerant circuit off
DHW heating on cylinder loading system off

Cause

Measures

Condensation temperature in defrosting process too low

Check whether compressor of outdoor unit is free of ice.
Check refrigerant charge. Top up if required.
Check refrigerant circuit reversal valve. Replace if required.

Evaporation temperature in cooling mode too high

Check whether one-off DHW heating is working. Check diverter valve function with actuator test. Replace if required.

Mechanical fault in cylinder loading pump

Perform a power reset. If fault occurs repeatedly, replace
cylinder loading pump.

Electrical fault in cylinder loading pump

Perform a power reset. If fault occurs repeatedly, replace
cylinder loading pump.

Cylinder loading pump running dry

Check shut-off valves. Perform a power reset. If fault occurs repeatedly, replace
cylinder loading pump. Fill system.

Short circuit, cylinder load- Check resistance value

ing system return temper- (NTC 10 k) at connection X1 of

ature sensor

cylinder loading system control

unit. Replace sensor if necessary.

Lead break, cylinder loading system return temperature sensor

Check resistance value (NTC 10 k) at connection X1 of cylinder loading system control unit. Replace sensor if necessary.

Short circuit, cylinder load- Check resistance value

ing system flow tempera- (NTC 10 k) at connection X1 of

ture sensor

cylinder loading system control

unit. Replace sensor if necessary.

Lead break, cylinder loading system flow temperature sensor

Check resistance value (NTC 10 k) at connection X1 of cylinder loading system control unit. Replace sensor if necessary.

Faulty configuration of re- Check DIP switch on refrigerant frigerant circuit controller circuit controller. Configure correct-
ly if necessary.

Communication error

Check settings in the commissioning assistant. Correct if required.
Check plug for secure seating and corrosion.
Check that the connections are correct.
Perform a power reset. If fault occurs repeatedly, replace
control unit of cylinder loading system.

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Warning messages

Fault and warning messages, Vitocal 200-S/222-S

Note The possible warning messages vary according to the system equipment. Therefore, not all warning messages will come up for every system.

Message code A.2
A.11 A.12 A.16
A.17
A.19 A.21 A.62
A.63
A.65 A.66

System characteristics

Cause

Measures

Frost protection enabled Heat demand, heat pump
running. DHW circulation pump ena-
bled

Outside temperature has undershot the specified frost protection limit.

No action required

Room heating/room cooling System pressure too low Top up with water. only for some rooms

Incorrect time

Battery in HPMU electronics module flat.

Replace CR2032 battery in HPMU electronics module.
Set the time on the programming unit: See operating instructions.

Refrigerant circuit off: Inver- Minimum flow rate underter and compressor cannot shot be switched on.
Instantaneous heating water heater is switched off. The instantaneous heating water heater will not start.

Check secondary pump/heating circuit pump, heating/cooling circuit 1.
Check flow sensor.

No increased DHW hygiene

Temperature for increased DHW hygiene is not reached.
DHW cylinder volume may be too large

Set period for increased DHW hygiene to fall on a period with low DHW demand.
Check DHW cylinder sizing.

Heat pump temporarily off

Temperature limiter has responded.

No action required If issue persists, consult Viess-
mann Technical Service.

The safety valve in the indoor Hydraulic system pressure Check the expansion vessel.

unit has opened.

too high

No scanning possible for sec- Lead break, PWM signal, Isolate the system from the power

ondary pump/heating circuit secondary pump/heating supply. Restart the system.

pump, heating/cooling cir- circuit pump, heating/cool- If the message remains displayed,

cuit 1

ing circuit 1

replace secondary pump/heating

circuit pump, heating/cooling cir-

cuit 1.

No scanning possible for heating circuit pump, heating/ cooling circuit 2

Lead break, PWM signal, heating circuit pump, heating/cooling circuit 2

Isolate the system from the power supply. Restart the system. If the message remains displayed, replace heating circuit pump, heating/cooling circuit 2.

No room heating/room cooling, heating/cooling circuit 2

Heating circuit pump, heating/cooling circuit 2 running dry.

Fill system and vent.

Secondary pump/heating circuit pump, heating/cooling circuit 1 not running.

No PWM signal, secondary pump/heating circuit pump, heating/cooling circuit 1 Incorrect circulation pump installed

Use only spare parts supplied or approved by Viessmann.

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Fault and warning messages, Vitocal 200-S/222-S Warning messages (cont.)

Message code A.68 A.74 A.75 A.82
A.83
A.84 A.85
A.86

System characteristics

Cause

Measures

Heating circuit pump, heating/cooling circuit 2 not running.

No PWM signal, heating Use only spare parts supplied or circuit pump, heating/cool- approved by Viessmann. ing circuit 2 Incorrect circulation pump installed

Unusual operating noise Pressure drop in secon Unusual starting and opera- dary circuit
tional characteristics

Check the expansion vessel. Fill system and vent.

Unusual operating noise Pressure spikes in secon Unusual starting and opera- dary circuit
tional characteristics

Check the expansion vessel. Check the system pressure. Top
up with water and vent if required.

Unstable control due to faulty pressure signal

Fault through internal monitoring of the pressure sensors of the affected CAN bus subscriber

Check CAN bus subscribers. Check refrigerant circuit control-
ler power supply. Check electronics module HPMU
power supply. If the message occurs frequently,
replace refrigerant circuit controller and/or HPMU electronics module.

No DHW heating

Cylinder temperature sensor signal faulty

Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 9 and 10. Floorstanding indoor unit: Connection at plug 5 on the HPMU electronics module

No room heating

Return temperature sensor signal faulty

Check resistance value (NTC 10 k) at connection X4.3/X4.4 of the EHCU electronics module. Replace sensor if necessary.

No DHW heating

Cylinder temperature sensor signal faulty

Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 9 and 10. Floorstanding indoor unit: Connection at plug 5 on the HPMU electronics module

No room heating, heating/ cooling circuit 1

Faulty signal, flow temperature sensor, secondary circuit or heating/cooling circuit 1

Check resistance value (NTC 10 k) at connection X4.1/X4.2 of the EHCU electronics module. Replace sensor if necessary.

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Warning messages (cont.)

Fault and warning messages, Vitocal 200-S/222-S

Message code A.87

System characteristics
No room heating, heating/ cooling circuit 2

A.88 A.89

Heat pump temporarily off Heat pump temporarily off

Cause

Measures

Faulty signal, flow temper- Check resistance value

ature sensor, heating/cool- (NTC 10 k) at the sensor input on

ing circuit 2

ADIO electronics module. Replace

sensor if necessary.

Evaporator overheating

No action required If issue persists, clean evaporator.

Condenser overheating

No action required If issue persists, consult Viessmann Technical Service.

A.90
A.91
A.96 A.99 A.100

Heat pump temporarily off

Temperature of hot gas No action required

temperature sensor CTT If the fault occurs repeatedly:

too high:

Check resistance value

Hot gas temperature

(NTC 10 k) at CCT connection

sensor CTT faulty

of refrigerant circuit controller.

Compressor overheating Replace sensor if necessary.

Check the cause of exceeding

the max. temperature at the com-

pressor. Remedy any fault.

The refrigerant circuit is temporarily switched off
Central heating and DHW heating only via instantaneous heating water heater

Outside temperature too low for heat pump operation
Operation without outdoor unit, for example for screed drying
Fault refrigerant circuit

No action required

Unusual operating noise Air in the secondary circuit Vent the system. Top up with water

Unusual starting and opera-

if required.

tional characteristics

Refrigerant circuit temporarily Flow temperature in sec- No action required

off (condenser frost protec- ondary circuit downstream

tion)

of condenser too low

Settings on the heat pump control unit deleted

Data memory on the elec- No action required

tronics modules faulty

If the fault occurs repeatedly, re-

place electronics modules.

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Fault and warning messages, Vitocal 150-A/151-A, Vitocal 250-A/252-A Fault messages

Note The possible faults vary according to the system

!

equipment. Therefore, not all fault messages will come

up for every system.

!

Please note Refrigerant can escape when working on the

refrigerant circuit.

It is essential that regulations and guidelines

on handling refrigerant are always observed

and adhered to: See “Safety information”.

Work on the refrigerant circuit must only be

carried out by a certified contractor (in accord-

ance with Regulations (EU) No 517/2014 and

2015/2067).

Specialist personnel working on a refrigerant

circuit with flammable refrigerant are required

to have specific qualifications and certification:

See “Safety information”.

Please note Repairing components that fulfil a safety function can compromise the safe operation of the system. Do not undertake any repairs on the inverter.
Replace the inverter if there is a defect. Replace faulty components only with genuine
Viessmann spare parts.

Message code F.1

System characteristics
The heat pump is switched off.

F.2

The heat pump is switched

off.

F.3

No defrost

No room cooling

F.4

No defrost

No room cooling

F.7

Only room heating

No DHW heating

Cause

Measures

Lead break, flow tempera- Check resistance value

ture sensor, secondary cir- (NTC 10 k) at connec-

cuit or heating/cooling cir- tion X4.1/X4.2 of the EHCU elec-

cuit 1

tronics module. Replace sensor if

necessary.

Short circuit, flow temperature sensor, secondary circuit or heating/cooling circuit 1

Check resistance value (NTC 10 k) at connection X4.1/X4.2 of the EHCU electronics module. Replace sensor if necessary.

Lead break, secondary circuit return temperature sensor

Check resistance value (NTC 10 k) at connection X4.3/X4.4 of the EHCU electronics module. Replace sensor if necessary.

Short circuit, secondary circuit return temperature sensor

Check resistance value (NTC 10 k) at connection X4.3/X4.4 of the EHCU electronics module. Replace sensor if necessary.

Lead break, cylinder temperature sensor

Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 9 and 10. Floorstanding indoor unit: Connection at plug 5 on the HPMU electronics module

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Fault and warning messages, Vitocal 150-A/151-A, Vitocal 250-A/252-A Fault messages (cont.)

Message code F.8
F.13
F.14
F.33 F.34 F.74

System characteristics

Cause

Measures

Only room heating No DHW heating

Short circuit, cylinder temperature sensor

Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 9 and 10. Floorstanding indoor unit: Connection at plug 5 on the HPMU electronics module

An outside temperature value Lead break, outside temof 0 °C is used to calculate perature sensor the set flow temperature.

Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 11 and 12. Floorstanding indoor unit: Connection at luster terminals for sensors, terminal 5 and 6

An outside temperature value Short circuit, outside temof 0 °C is used to calculate perature sensor the set flow temperature.

Check resistance value (NTC 10 k). Replace sensor if necessary. Wall mounted indoor unit:
Connection on the underside of the appliance to 6-pole connection socket on the right, terminals 11 and 12. Floorstanding indoor unit: Connection at luster terminals for sensors, terminal 5 and 6

Refrigerant circuit off

Lead break, air inlet temperature sensor

Check resistance value (NTC 10 k) at connection X16.3/X16.4 of the VCMU refrigerant circuit controller. Replace sensor if necessary.

Refrigerant circuit off

Short circuit, air inlet temperature sensor

Check resistance value (NTC 10 k) at connection X16.3/X16.4 of the VCMU refrigerant circuit controller. Replace sensor if necessary.

The heat pump is switched off.

Hydraulic system pressure Top up with water.

too low

Vent the system.

If the fault occurs repeatedly: Check system pressure sensor
with external pressure gauge. Check the pre-charge pressure
of the expansion vessel. Check settings for set system
pressure and range.

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Fault and warning messages, Vitocal 150-A/151-A, Vitocal 250-A/252-A Fault messages (cont.)

Message code F.75 F.87 F.91
F.92
F.93
F.94

System characteristics

Cause

Measures

The heat pump is switched off.

No flow in the secondary circuit, or flow sensor faulty

Check secondary pump//heating circuit pump, heating/cooling circuit 1. Replace secondary pump//heating circuit pump, heating/cooling circuit 1 if required.
Check flow sensor. Replace flow sensor if required.

The safety valve in the indoor Hydraulic system pressure Reduce the system pressure.

unit has opened.

too high

Function of connected com- DIO electronics module ponents in emergency mode communication error

Check the settings in the commissioning assistant. Adjust settings if required.
Check connections to DIO electronics module and connection to HPMU electronics module.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace DIO electronics module.

Function of connected components in emergency mode

ADIO electronics module communication error

Check the settings in the commissioning assistant. Adjust settings if required.
Check connections on ADIO electronics module.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace ADIO electronics module.

Function of connected components in emergency mode

M2IO electronics module communication error

Check the settings in the commissioning assistant. Adjust settings if required.
Check connections on M2IO electronics module.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace M2IO electronics module.

Function of the relevant elec- SDIO electronics module tronics module in emergency communication error mode

Check the settings in the commissioning assistant. Adjust settings if required.
Check connections on SDIO electronics module.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace SDIO electronics module.

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Fault and warning messages, Vitocal 150-A/151-A, Vitocal 250-A/252-A Fault messages (cont.)

Message code F.99

System characteristics
Function of the electronics modules connected to PlusBus not available

F.100

Function of the electronics modules connected to PlusBus not available

F.101

Function of the electronics modules connected to PlusBus not available

F.102 F.103

No WiFi No operation possible

Cause Communication error PlusBus
Short circuit, PlusBus
PlusBus voltage error
Communication error, WiFi communication module HMI programming unit communication error

Measures
Check the settings in the commissioning assistant. Adjust settings if required.
Check connections at plug 74 of the HPMU electronics module.
Wall mounted indoor unit: Check the connections at plug 74 on the connection socket on the underside of the appliance.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace HPMU electronics module.
Check PlusBus power supply at HPMU electronics module: Isolate all PlusBus components connected. Reconnect each one in turn.
Check connections at plug 74 of the HPMU electronics module.
Wall mounted indoor unit: Check the connections at plug 74 on the connection socket on the underside of the appliance.
Check whether there is a short circuit at the PlusBus cables.
Isolate the system from the power supply. Restart the system. If the fault persists, replace HPMU electronics module.
Check PlusBus power supply at HPMU electronics module: Isolate all PlusBus components connected. Reconnect each one in turn.
Check connections at plug 74 of the HPMU electronics module.
Wall mounted indoor unit: Check the connections at plug 74 on the connection socket on the underside of the appliance.
Check whether there is a short circuit at the PlusBus cables.
Isolate the system from the power supply. Restart the system. If the fault persists, replace HPMU electronics module.
Replace the WiFi communication module.
Replace HMI programming unit.

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Fault and warning messages, Vitocal 150-A/151-A, Vitocal 250-A/252-A Fault messages (cont.)

Message code F.104
F.111 F.112 F.117 F.118 F.123 F.124 F.147 F.148 F.149

System characteristics Depending on configuration of EM-EA1 extension (DIO electronics module) Refrigerant circuit off
Refrigerant circuit off
Refrigerant circuit off
Refrigerant circuit off
Refrigerant circuit off
Refrigerant circuit off
Refrigerant circuit off
Refrigerant circuit off
The refrigerant circuit is controlled with the replacement value.

Cause External fault message input active
Lead break, liquid gas temperature sensor, heating
Short circuit, liquid gas temperature sensor, heating
Lead break, evaporator suction gas temperature sensor
Short circuit, evaporator suction gas temperature sensor
Lead break, liquid gas temperature sensor, condenser
Short circuit, liquid gas temperature sensor, condenser
Lead break, compressor suction gas temperature sensor
Short circuit, compressor suction gas temperature sensor
Lead break, liquid gas temperature sensor, cooling

Measures
Check the settings in the commissioning assistant for fault message input. Adjust settings if required.
Check connected external appliance.
Check resistance value (NTC 10 k) at connection X21.1/X21.2 of the VCMU refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X21.1/X21.2 of the VCMU refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X20.5/X20.6 of the VCMU refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X20.5/X20.6 of the VCMU refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X15.1/X15.2 of the VCMU refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X15.1/X15.2 of the VCMU refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X14.7/X14.8 of the VCMU refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X14.7/X14.8 of the VCMU refrigerant circuit controller. Replace sensor if necessary.
Check resistance value (NTC 10 k) at connection X16.1/X16.2 of the VCMU refrigerant circuit controller. Replace sensor if necessary.

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Fault and warning messages, Vitocal 150-A/151-A, Vitocal 250-A/252-A Fault messages (cont.)

Message code F.150 F.151 F.152 F.155 F.156 F.160
F.425 F.430 F.431 F.454

System characteristics The refrigerant circuit is controlled with the replacement value.
Refrigerant circuit off
Refrigerant circuit off
The refrigerant circuit is locked. The refrigerant circuit is locked. No communication between the affected electronics modules
Values in energy cockpit incorrect
Operation with internal set value specifications of the heat pump control unit
Operation with internal set value specifications of the heat pump control unit
The refrigerant circuit is locked.

Cause

Measures

Short circuit, liquid gas temperature sensor, cooling

Check resistance value (NTC 10 k) at connection X16.1/X16.2 of the VCMU refrigerant circuit controller. Replace sensor if necessary.

Lead break, hot gas temperature sensor

Check resistance value (NTC 10 k) at connection X14.9/X14.10 of the VCMU refrigerant circuit controller. Replace sensor if necessary.

Short circuit, hot gas temperature sensor

Check resistance value (NTC 10 k) at connection X14.9/X14.10 of the VCMU refrigerant circuit controller. Replace sensor if necessary.

Fault, electronic expansion valve 1

Check electronic expansion valve 1. Replace expansion valve if required.

Fault, electronic expansion valve 2

Check electronic expansion valve 2. Replace expansion valve if required.

CAN bus general communication fault between the affected electronics modules

Check the CAN bus cable. Check the CAN bus subscriber
numbers. Isolate the system from the pow-
er supply. Restart the system. If the fault persists, replace the CAN bus cables. Replace the electronics modules if required.

Time synchronisation not possible

Replace CR2032 battery in HPMU electronics module.
Set the time on the programming unit: See operating instructions.

Communication error, gateway

Check connections and connecting cable to the gateway. Replace cable if required.
Check power supply to the gateway.

KNX/TP gateway communication error

Check connections and connecting cable to the gateway. Replace cable if required.
Check power supply to KNX/TP gateway.

Incorrect version of oper- Check the version of the operat-

ating software for the elec- ing software for HPMU and EH-

tronics modules

CU electronics modules and for

the VCMU refrigerant circuit con-

troller.

Install correct software version if

required.

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Fault and warning messages, Vitocal 150-A/151-A, Vitocal 250-A/252-A Fault messages (cont.)

Message code F.472
F.519 F.520
F.542
F.543

System characteristics No communication with energy meter
Operation with internal set value specifications of the heat pump control unit Refrigerant circuit off
Mixer closes. Heating circuit pump is operational.
Mixer closes. Heating circuit pump is operational.

Cause

Measures

Communication error, energy meter

Check the settings in the commissioning assistant. Adjust settings if required.
Check the connections to the HPMU electronics module.
Check whether components are wrongly connected.
Isolate the system from the power supply. Restart the system. If the fault persists, replace HPMU electronics module.

BACnet/IP gateway communication error

Check connections and connecting cable to the gateway. Replace cable if required.
Check power supply to BACnet/IP gateway.

Communication error, Modbus

Check the Modbus cable between inverter and refrigerant circuit controller VCMU at connection X11/X13 on refrigerant circuit controller VCMU.
Isolate the system from the power supply. Restart the system. If the fault persists, replace the VCMU refrigerant circuit controller and/or the inverter.

Lead break, flow temperature sensor, heating/cooling circuit 1 with mixer Or Wrong setting during commissioning

Check the settings in the commissioning assistant. Adjust settings if required.
Check setting of rotary switch S1 on ADIO electronics module.
Check flow temperature sensor in heating/cooling circuit 1.
Check resistance value (NTC 10 k) at the sensor input on ADIO electronics module. Replace sensor if necessary.

Short circuit, flow temper- Check the settings in the com-

ature sensor, heating/cool- missioning assistant. Adjust set-

ing circuit 1 with mixer

tings if required.

Check setting of rotary switch S1

on ADIO electronics module.

Check flow temperature sensor

in heating/cooling circuit 1.

Check resistance value

(NTC 10 k) at the sensor input

on ADIO electronic

References

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