WORCESTER GR8300iW 30 S Gas Fired Condensing System Boiler Instructions

: June 6, 2024
: WORCESTER

Table of Contents

GR8300iW 30 S Gas Fired Condensing System Boiler
References
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GR8300iW 30 S Gas Fired Condensing System Boiler

User Instructions
Gas fired condensing system boiler Greenstar 8000 Life
GR8300iW 30 S | GR8300iW 35 S

6720883870 (2021/05) UK/IE

Preface
Preface
Dedicated to heating comfort. Thank you for purchasing a Worcester product. We pride ourselves on manufacturing appliances to the strictest quality control standards throughout every stage of production. Worcester, Bosch group has led the field in innovative product design and performance for over 50 years. This heritage means all our products are of exceptional quality and proven reliability. Our products employ the latest technologies and they are reliable, extremely energy efficient, offering you economical running costs and value for money. They are amongst the top energy rated appliances available. There is also the reassurance of our parts and labour guarantee. Our Customer Service team is here to help you get the best from your Worcester product throughout its lifetime. Whatever your enquiry, our specially trained team is available at our Worcester based contact centre and online via the website. For contact details see the back cover.

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Table of contents

Table of contents
1 Explanation of symbols and safety instructions . . . . . . . . . . . 3 1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 3
2 Product Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 Appliance identification and serial number . . . . . . . . . . 5 2.2 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Maintaining your appliance . . . . . . . . . . . . . . . . . . . . . . . 5 2.4 Benchmark standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Prepare for operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1 Open vented heating system . . . . . . . . . . . . . . . . . . . . . . 6 3.2 Sealed heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2.1 Checking the system pressure. . . . . . . . . . . . . . . . . . . . . 6 3.2.2 Constantly re-pressurising the system . . . . . . . . . . . . . . 6 3.3 Topping up the system pressure . . . . . . . . . . . . . . . . . . . 6
4 Operating the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1 Control panel overview . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.2 Symbols in the display . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.3 Heating key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.4 Hot water mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.4.1 Hot water key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.5 eco key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.6 Selecting current pressure. . . . . . . . . . . . . . . . . . . . . . . . 8
5 Key (accessories) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1 Installing the Key. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.2 Key LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.1 Setting frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Thermal disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8 Clearances and ventilation information . . . . . . . . . . . . . . . . . . 9 8.1 Appliance clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 8.2 Ventilation information. . . . . . . . . . . . . . . . . . . . . . . . . .10
9 Malfunction or failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 9.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 9.2 Extreme cold weather . . . . . . . . . . . . . . . . . . . . . . . . . .11 9.3 System gassing troubleshooting . . . . . . . . . . . . . . . . . .11
10 Environmental protection and disposal . . . . . . . . . . . . . . . . .13
11 Tips on energy saving. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
12 Your guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
13 Energy consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 13.1 Product data on energy consumption . . . . . . . . . . . . . .15

1 Explanation of symbols and safety instructions
1.1 Explanation of symbols Warnings In warnings, signal words at the beginning of a warning are used to indicate the type and seriousness of the ensuing risk if measures for minimizing danger are not taken. The following signal words are defined and can be used in this document:
DANGER DANGER indicates that severe or life-threatening personal injury will occur.
WARNING WARNING indicates that severe to life-threatening personal injury may occur.
CAUTION CAUTION indicates that minor to medium personal injury may occur.
NOTICE NOTICE indicates that material damage may occur.
Important information

The info symbol indicates important information where there is no risk to people or property.

Additional symbols

Symbol ·
Table 1

Meaning a step in an action sequence a reference to a related part in the document a list entry a list entry (second level)

1.2 General safety instructions
H Notices for the target group These operating instructions are intended for the heating system operator.
All instructions must be observed. Failure to comply with instructions may result in material damage and personal injury, including danger to life.
Read and retain the operating instructions (heat source, heating controller, etc.) prior to operation.
Observe the safety instructions and warnings.

H Determined use The product may only be used for the heating of boiler water and for DHW heating.

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Explanation of symbols and safety instructions
Any other use is considered inappropriate. We assume no liability for damage occurring due to non-permitted use.
H If you smell gas A gas leak could potentially cause an explosion. If you smell gas, observe the following rules:
Prevent flames or sparks: Do not smoke, use a lighter or strike matches. Do not operate any electrical switches or unplug any equipment. Do not use the telephone or ring doorbells.
Turn off the gas at the meter or regulator. Open windows and doors. Warn your neighbours and leave the building. Prevent anyone from entering the building. Move well away from the building: call the National
Gas Emergency Service on 0800 111 999. L.P.G. boilers: Call the supplier’s number on the
side of the gas tank.
H Danger to life from poisoning by flue gas There is a danger to life from escaping flue gas.
Never modify any parts through which flue gas is routed.
If flues are damaged or leaking, or if you smell flue gas, observe the following rules.
Switch off the heat source. Open doors and windows Warn your neighbours and leave the building
immediately. Prevent third parties from entering the building. Notify an approved contractor. Have any defects rectified.
H Danger to life from carbon monoxide Carbon monoxide (CO) is a poisonous gas, which arises during the incomplete combustion of fossil fuels such as oil, gas or solid fuels.
Dangers arise, if carbon monoxide escapes from the heating system due to a fault or a leak and collects unnoticed in enclosed spaces.
You can neither see, taste nor smell carbon monoxide.
To avoid danger from carbon monoxide: Have the heating system inspected and serviced
regularly by an approved contractor. Use a CO detector, which gives an alarm in good
time if CO escapes.

If you suspect a CO leak: Warn your neighbours and leave the building immediately. Call an approved contractor. Have any defects rectified.
H Inspection, cleaning and maintenance The user is responsible for ensuring the heating system is safe and environmentally compatible.
Non-existent or improper inspection, cleaning and maintenance may result in personal injury, including danger to life or material damage.
We recommend that you enter into a contract covering an annual inspection and responsive cleaning and maintenance with an approved contractor.
Have work carried out only by an approved contractor.
Have the heating system inspected by an approved contractor at least once a year.
Have any required cleaning or maintenance work carried out immediately.
Have any defects in the heating system remedied immediately, independent of the annual inspection.
H Fittings and modification Only a competent engineer can remove the appliance case and carry out any work, in accordance with the relevant Installation Regulations.
Any misuse or unauthorised modifications to the appliance, flue or associated accessories and heating system will invalidate the guarantee. Do not modify the appliance or flue system in any
way.
Worcester, Bosch Group accepts no liability arising from any such actions. This does not affect your statutory rights.
H Combustion air/ambient air The air in the installation location must be free of flammable or chemically aggressive substances.
Do not store or use any flammable or explosive materials (paper, petrol, thinners, paints, etc.) in the vicinity of the heat source.
Do not store or use any corrosive substances (solvents, adhesives, chlorinated cleaning agents, etc.) in the vicinity of the heat source.
H General considerations The boiler must be installed in a well ventilated area.
The openings must be kept in good condition.

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Product Information

The vents or any other component contributing to the functioning of the boiler must not be reduced or sealed.
We recommend an annual service of the appliance by an approved engineer to ensure reliable and efficient operation.
H Safety of electrical devices for domestic use and similar purposes
The following requirements apply in accordance with EN 60335-1 in order to prevent hazards from occurring when using electrical appliances: “This appliance can be used by children of 8 years and older, as well as by people with reduced physical, sensory or mental capabilities or lacking in experience and knowledge, if they are supervised and have been given instruction in the safe use of the appliance and understand the resulting dangers. Children shall not play with the appliance. Cleaning and user maintenance must not be performed by children without supervision.” “If the power cable is damaged, it must be replaced by the manufacturer, its customer service department or a similarly qualified person, so that risks are avoided.” H Please read these instructions carefully These instructions are applicable to the Worcester
appliance model/s stated on the front cover only. These instructions apply in the UK/IE only and must
be followed except for any statutory obligation.
2 Product Information
2.1 Appliance identification and serial number
0010022840-001
Fig. 1 Position of data label The data label contains information of the appliance model and serial number. This is located on the frame of the front cover.

For your own records Please ensure that the Commissioning Checklist has been completed by your installer or service engineer.
Model:
Serial number:
Date of installation:
Table 2 Appliance details
The appliance model and serial number can be found on the appliance data label.
2.2 Servicing
Ensure that the service engineer completes the Service Record in the Benchmark Checklist after each service.
The Service Record can be found at the rear of the appliance’s Installation and Maintenance Instructions. It will be required in the event of any guarantee work and may be required by the local Building Control Inspector. To ensure the continued safe, reliable and environmentally optimum
operation of the boiler, it must be thoroughly serviced annually by a competent, qualified person, such as a Worcester service engineer, British Gas engineer or other Gas Safe registered engineer. In the Republic of Ireland servicing work must be carried out by a Worcester service engineer or other Registered Gas Installer (RGII). Having a contract covering annual servicing, cleaning and
maintenance is a good way to ensure this is not missed. It is important that any required maintenance or repairs are
carried out without delay. Ensure that the service engineer completes the Service Record, at
the rear of the Installation and Maintenance Instructions manual, after each service. Have any work carried out by a competent, qualified person, Worcester service engineer, British Gas engineer or other Gas Safe registered engineer. In the Republic of Ireland servicing work must be carried out by a Worcester service engineer or other Registered Gas Installer (RGII). Always use original spares, to help maintain the efficiency, safety and reliability of the appliance.
2.3 Maintaining your appliance Your new appliance represents a long term investment in a reliable, high quality product. Wipe the appliance casing with a soft clean cloth. Please do not use chemical cleaning products which may damage the paint finish. In order to realise the appliance’s maximum working life, and to ensure the appliance continues to operate at peak efficiency and performance, it is essential that servicing and maintenance checks are performed at least once a year by a competent engineer in accordance with the current Gas Safe Regulations. If you would like to know more about servicing options from Worcester, Bosch Group, please visit worcester-bosch.co.uk. Please tick the appropriate box on your warranty registration card for further details of the Worcester, Bosch Group Service Contract. When your appliance requires servicing please contact a Worcester, Bosch Group contact centre (see rear cover, appointments). In addition to the service contract we are pleased to offer a one-off annual service or breakdown call out for your appliance.

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Prepare for operation
Maintenance tips · Appliances on a sealed heating system:
Regularly check the system pressure. · Do not obstruct the flue outlet or the air inlet. · Use in hard water areas:
In exceptionally hard water areas a device to prevent scale formation may be fitted. Installation of a salt based water softener should be in accordance with the requirements of the local water company. A bypass valve must be fitted and used to fill/top up the heating system with untreated water.

3.2.1 Checking the system pressure
If the pressure is too low ( 0.2 bar) the system is out of operation and the warning notification LoPr alternating with the actual pressure stays on the screen.

Important note: If you have to add water regularly in your heating system, call a
competent, qualified person.
2.4 Benchmark standard The Benchmark initiative is a code of practice to encourage the correct installation, commissioning and servicing of domestic central heating appliances and system equipment.
A “checklist” is dispatched with every appliance and can be found towards the back of the Installation, Commissioning and Servicing Instructions. This is a vital document that needs to be completed by the installer at the time of installation. It confirms that the appliance has been installed and commissioned according to the manufacturer’s instructions. The service record provides space for the recording of regular servicing of the appliance/heating system and this can become a valuable document when, for example, you wish to sell the property. The service record will show a potential purchaser that the heating system has received regular professional maintenance and servicing during its lifetime. The Benchmark initiative aims to: · Raise standards among professional installers. · Build and maintain high safety standards in the industry. · Improve customer satisfaction levels. · Make a contribution to the nation’s commitment to climate change.
3 Prepare for operation
3.1 Open vented heating system Appliances that can be connected to open vented heating systems will have the pressure maintained automatically by the header tank feeding the system.
3.2 Sealed heating system Appliances that can be connected to sealed heating systems are prepressurised before operation, this pressure must be maintained for safe use of the appliance. Check regularly that the pressure is maintained. Re-charge the system if the display reads less than 1 bar. If a permanent significant decrease or increase in pressure is
indicated on the display, contact your installer or maintenance engineer.

eco !
bar kWh %

reset

eco

ok

5 sec

Fig. 2 Actual pressure

0010026149-001

Your installer will advise you of the optimum operating pressure. Press the ok key.
The actual pressure appears. Top up the heating water, if the pressure is low ( 0.8 bar) or too low
( 0.2 bar).

3.2.2 Constantly re-pressurising the system Constantly having to re-pressurise the heating system should be investigated as it is an indicator of potential leaks and the concentration of inhibitor protection in the system will be reduced; this can result in corrosion within the heating system, reducing efficiency and increasing contaminates.
Check for leaks on heating system (pipework and radiator valves). Contact your installer or maintenance engineer if a recurring
significant decrease or increase in pressure is indicated on the pressure screen.
System pressure increasing: If the system pressure repeatedly increases and you need to vent air
from the radiators, refer to section 3.3 “Topping up the system pressure”, page 6.

3.3 Topping up the system pressure

External filling loop Once the external filling loop and pressure gauge/menu has been located, follow the instructions for re-pressurising the system. Unscrew the blanking cap [1]. Attach the hose [2] to the valve.
Usually one end of the hose is already connected to one of the system fill isolation valves.
Ensure both ends [3] of the hose are screwed on hand tight. Monitor the pressure at the display.
The system fill isolation valves [4] are in a closed position (the handle/screwdriver slot is across the valve).
Turn the handle/screwdriver slot through 90° to open valves and slowly fill the system. The system fill isolation valves [5] are opened (the handle/ screwdriver slot is in-line with the valve). The pressure at the display will start to rise.

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Set the pressure between 1 and 1.5 bar pressure. Turn the handles/screwdriver slots back, through 90°, to close the
valves. The system fill isolation valves [6] are in a closed position (the
handle/screwdriver slot is across the valve).
Top up the system pressure, if as a result of the air bleeding the pressure drops off.
Once the pressure has settled between 1 and 1.5 bar. Ensure the valves are closed. Remove the hose [2] and replace the blanking cap [1].

Operating the appliance
4 Operating the appliance
4.1 Control panel overview
1 7

3 2
1

eco !
bar kWh %
6

eco !
bar kWh %
5

eco !
bar kWh %
4

Fig. 3

0010025545-001

If the pressure reads more than 1.5 bar as a result of over filling:
Bleed one radiator until the pressure gauge returns to between 1 and 1.5 bar.

reset

2

eco

ok

6

5 sec

3

5

4

0010021505-001

Fig. 4 Control panel

[1] Display [2] and keys: To navigate through menus and increase/decrease
settings [3] d key: Return/back [4] ok key: Save settings, Chimney sweeper key (Service Engineer
function): press 5 seconds for chimney sweeper mode [5] eco key: Hot water preheat selection (only available if the optional
integral diverter valve kit is fitted) [6] Hot water key: Adjusting the hot water temperature (only available
if the optional integral diverter valve kit is fitted) [7] Heating key: Heating mode on, set the maximum flow
temperature

4.2 Symbols in the display

Symbol

Explanation Central heating ON
Is displayed with the appliance status code and diagnostic code during a fault condition. Burner ON/OFF

Connection with the Wi-Fi network (only available with accessories) Connection with RF transmitter, e.g. Comfort+ II RF room thermostat (only available with Key accessories) chimney sweep mode
Service mode
Eco-Mode
Hot water ON (only available if optional integral diverter valve kit is fitted) Table 3 Symbols in the display

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7

Key (accessories)

The heating and hot water settings have been adjusted by the installer to the appliance’s optimum settings. Before making any adjustments it is advisable to make a note of these
settings so that you can return to these optimum settings in the future.
4.3 Heating key The heating key is used to set the max. flow temperature. The maximum flow temperature can be set between 30 °C and 88 °C1). The current flow temperature is shown on the display.

With underfloor heating systems observe the maximum permissible flow temperature.

Press the ( key. The set maximum flow temperature appears.
Press the or keys to set the desired maximum flow temperature.

Supply temperature

Sample application

Approx. 50 °C

Underfloor heating system

Approx. 75 °C

Radiator heating system

Approx. 82 °C

Convector heating system

Table 4 Maximum flow temperature

To save the setting, press the ok key or wait for 2 seconds. The symbol appears for a short time.

4.5 eco key In eco mode the appliance will heat the cylinder if the temperature is approximately 12 °C below the set temperature. Eco mode is enabled by default, during the initial appliance start up. In Preheat mode the appliance will heat the cylinder if the temperature is approximately 6 °C below the set temperature. The appliance heats the cylinder more frequently. This tops up the cyclinder temperature for quicker heat up times, this is useful for large/longer demand periods.
4.6 Selecting current pressure Press the ok key.
The actual pressure appears.
5 Key (accessories)
5.1 Installing the Key

Installing the Key will enable additional functions. For Pairing Key manual.

Always turn off the power to the appliance before installing Key (accessories). Plug Key into Key housing.

If a time program is activated and set on auto press the ok key to switch to Advance. Time programs are available with Key (accessories).
auto: Heating is switched on and off according to programmed times for heating. Advance: Switch to Advance to move to the next on or off time and directly switch on or off heating.
4.4 Hot water mode
4.4.1 Hot water key

Fig. 5 Position of Key housing

0010022807-002

Hot water function is only available with optional integral diverter valve kit is fitted.
CAUTION Risk of scalding At maximum adjusted hot water temperature can cause serious scalding. Only use the maximum adjustable hot water temperature for thermal
disinfection.
The hot water temperature can be set between 35 °C and 60 °C. Press the * key.
The set hot water temperature appears. To set the desired hot water temperature, press the or keys.
The setting will be saved after 5s or after pressing the ok key.

2 1
0010023127-001
Fig. 6 Locking mechanism The lever [2] of the locking mechanism is located right hand side of
the Key housing. Ensure that it is in its Open position before inserting the Key and pulling lever [2] towards front. Turn on the power. LED [1] starts blinking green. Wait until LED is constantly yellow.

The maximum value can be reduced by the service technician.
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5.2 Key LED

Key LED status The LED on the Key displays different states with flashing or constant colours.

Description of the LED displays

Example

Flashing red:

Fault, e.g. no communication between the Key and appliance:
Install the Key again, restore the last functioning status.

Flashing yellow:

No fault, user please wait.

Flashing green:

No fault, initialisation process is running.

Constant red:

Temporary fault: Wait for normal operating condition to be resumed.

Constant yellow:

No fault, time and date not available: Set the time and date on the appliance. -or Key with touch-sensitive indicator: Press touch-
sensitive indicator on Key to start pairing.

Constant green:

No fault, normal operating condition.

LED Off:

No fault, power-saving mode or appliance without power.

Table 5 LED status

Shutdown
Do not discharge DHW unmixed.
Proper thermal disinfection involves the DHW system including the draw-off points. Set the thermal disinfection in the hot water program of the heating
controller ( heating controller operating instructions). Close DHW draw-off points. Set any DHW circulation pump to continuous operation. Wait until the maximum temperature is reached. Open all DHW draw-off points, from the nearest to the one furthest
away, and draw off hot water until hot water at a minimum of 70 °C has flown from all draw-off points for at least 3 minutes. Restore the original settings.
8 Clearances and ventilation information
8.1 Appliance clearances Your installer will have provided adequate space around the appliance for operation, safety and servicing/maintenance access. · The following detail the necessary clearance around the appliance for
service and maintenance.
CAUTION Risk of damage to appliance or property The appliance will overheat if the clearance space around the appliance is restricted by objects. Do not restrict this space with the addition of cupboards, shelves etc.
next to or around the appliance. Do not store any combustible materials on or next to the appliance,
such as clothes, towels, paper or plastic bags.

6 Shutdown
6.1 Setting frost protection
NOTICE
Risk of damage to the system from frost! The heating system can freeze up after a prolonged period (e.g. during a power failure, switching off the power supply, faulty fuel supply, boiler fault etc.). Ensure that the heating system is in constant use (particularly when
there is a risk of frost).
If you are leaving your property unoccupied during cold weather, please leave your external programmer on constant and your room thermostat set to 12 °C.

0010012940-001

7 Thermal disinfection
To prevent hot water from becoming contaminated by bacteria such as legionella, we recommend thermal disinfection after long downtimes.
CAUTION
Risk of scalding. During thermal disinfection, discharging unmixed hot water can cause serious scalding. Only use the maximum adjustable hot water temperature for thermal
disinfection. Inform occupants of the premises of the risk of scalding. Perform thermal disinfection outside of the normal operating times.

Fig. 7 Appliance minimum clearances

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Malfunction or failure

Minimum clearances

Description

Dimensions [mm]

X

Appliance width

440

Y

Appliance height

780

Z

Appliance depth

365

Installation/Maintenance

1

Overall clearance height

1,150/1,190*

2

Overall clearance depth

965

3

In front of appliance

450

4

Overall clearance width

450

5

Above the appliance

170/210*

6

Either side of appliance

5

7

Below the appliance

200

8

Compartment depth

385

9

Appliance to removable door

20

Table 6

[*] Height for either 60/100 flue or 80/125 flue

8.2 Ventilation information The air supply must not be restricted or contaminated.

Ventilation considerations
Do not place objects to hinder the air circulation required by the appliance.
The installation premises may require ventilation to be fitted according to its features or use.

9 Malfunction or failure
If you believe there is a problem with your central heating or hot water supply, before you contact your installer/maintenance engineer and report the error and appliance type carry out the following checks.
Basic checks
Some items to check before placing a call are: · Is the electrical power switched on to the appliance? · Is the programmer/timer set to ON or in an ON period? · Is the room thermostat set too low? · Is the cylinder thermostat (if fitted) set too low? · Is the cold water main turned on? · Sealed heating system:
Is the static system pressure (when appliance is cold) between 1 and 1.5 bar?
· Do you have gas? Are other gas appliances working, gas cooker/hob for example? Has your credit run out on your gas pre-payment meter?
Details of your installer should be available in the Commissioning Checklist or can be recorded in the following section.

10

Installer/maintenance engineer
Installer/maintenance engineer details Engineer name:
Company name: Company address:
Telephone:
Email:
Table 7 Worcester, Bosch Group The appliance is supported in the UK and Eire by Worcester, Bosch Group. Specialist service engineers are available to attend an appliance breakdown.
Invoices for attendance and repair work carried out on this appliance by any third party will not be accepted.
· No charge will be made for parts and/or labour providing: The appliance fault is found and the appliance is within the guarantee period. Reasonable evidence of this must be supplied on request. i.e. a completed Commissioning and service record and has been regularly serviced at least once a year.
· A call-out charge will be made where: The appliance is outside the guarantee period or has not been serviced in accordance with the manufacturers instructions. Our Field Service Engineer finds no fault with the appliance. The cause of breakdown is misuse or with other parts of your plumbing/heating system, or with equipment not supplied by Worcester, Bosch Group.
No appliance fault is found on over 30% of all service calls. In the case of a suspected fault, refer to the basic checks earlier in this
section.
In the event of an appliance fault or breakdown please contact Worcester, Bosch Group appointments team on 0330 123 9339. Your advisor will arrange for an engineer to call with the minimum of delay; under normal circumstances this will be from 13 working days (excluding weekends and bank holidays) for priority breakdown situations (no hot water and/or heating).
9.1 Troubleshooting If there is fault in the system, there will be a message shown on the display. The cause of the fault is coded (e.g. fault code 232). Press the and keys together until fault disappears.
The appliance starts up again and the current supply temperature is displayed. If a fault persists: Contact the contractor or the customer service. Provide them with the displayed fault code and the device data ( table 2).
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9.2 Extreme cold weather In certain instances where the condensate pipe work is run externally or in an unheated area, such as a garage, the condensate pipe work can be at risk of freezing, even if well insulated. A frozen/blocked condensate pipe will cause the boiler to shut down. Worcester, Bosch Group have available helpful videos on thawing frozen condensate pipe work on our website in the Customer service section.
WARNING
Falling hazard! Failure to follow this guidance may result in personal injury. Only attempt to thaw a condensate pipe that is at ground level and
easily accessible. Never attempt to thaw a condensate pipe that is at height.
CAUTION
Risk of damage to pipe work! Thermal shock from boiling water can damage plastic pipes. DO NOT use boiling water to thaw the condensate pipe!
CAUTION
Slip hazard Ensure that the subsequent freezing of any water does not result in a
slip hazard.
If the condensate pipe has frozen: Locate the blockage.
It is likely that the pipe is frozen at the most exposed point outside the building or where there is an obstruction to flow. This could be the open end of the pipe, at a bend or elbow, or where there is a sag in the pipe in which condensate can collect.
The location of the blockage should be identified as closely as possible before taking further action.
Thaw the frozen pipe. The pipe can be thawed by applying a hot water bottle, a microwaveable heating pack (the sort used for muscular aches and pains) or a cloth soaked in hot water to the exterior of the pipe, close to the point of blockage. Hot water, but not boiling, can also be poured onto the pipe from a watering can or similar container. Care must be taken at pedestrian areas where this water may freeze and create a slip hazard.
Worcester, Bosch Group have available on our website helpful videos in the Customer service section to aid in thawing a frozen pipe.
Reset the appliance and wait two or three minutes for the appliance to restart.
Contact Worcester, Bosch Group Appointments Team on: 0330 123 9339, if the boiler does not restart.
Contact your installer in order to find a permanent solution to the problem.

Malfunction or failure
9.3 System gassing troubleshooting
WARNING Caution must be exercised when venting radiators or adjusting system pressure after commissioning of your boiler. Do not repeatedly vent your radiators, if symptoms persist, contact a heating engineer. Do not vent air from radiators whilst the central heating is switched
on; turn your boiler off. Whilst venting radiators, do not allow the pressure on the boiler to
drop below the pressure at which it is normally set.
CAUTION If the pressure in your heating system is repeatedly rising (this can be checked via the boilers pressure gauge or digital display and should be checked when the system is cold), and especially if you need to keep venting the radiators, urgent action is required and you must contact a heating engineer. This can indicate that there is corrosion occurring within the heating system Note: Ensure the reading stays between minimum and maximum operating pressures at all times whilst the boiler is operating This must be properly addressed to prevent serious damage to the
entire system. Failure to properly maintain the heating system may affect your
warranty.

Greenstar 8000 Life 6720883870 (2021/05)

11

Malfunction or failure

Is your system pressure constantly increasing even when the boiler is off for extended periods of time?

NO

YES

Does system pressure increase when the boiler is on?
NO
Is your system pressure regularly dropping (i.e. you constantly
have to top up your boilers pressure)

Can you confirm that the filling link is not stuck open/passing
water in any way?
YES
Does the system pressure increase to the high pressure red zone on the pressure gauge?

NO

YES

Your boiler
is fine

Contact a
service engineer

NO

YES

Your boiler
is fine

Contact a
service engineer

Fig. 8 Gassing flow chart

Does the problem persist?

Your

boiler is

NO

fine

YES

NO

0010036321-001

Contact a
service engineer

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Greenstar 8000 Life 6720883870 (2021/05)

Environmental protection and disposal

10 Environmental protection and disposal
Environmental protection is a fundamental corporate strategy of the Bosch Group. The quality of our products, their economy and environmental safety are all of equal importance to us and all environmental protection legislation and regulations are strictly observed. We use the best possible technology and materials for protecting the environment taking account of economic considerations.
Packaging Where packaging is concerned, we participate in country-specific recycling processes that ensure optimum recycling. All of our packaging materials are environmentally compatible and can be recycled.
Used appliances Used appliances contain valuable materials that can be recycled. The various assemblies can be easily dismantled. Synthetic materials are marked accordingly. Assemblies can therefore be sorted by composition and passed on for recycling or disposal.
Old electrical and electronic appliances This symbol means that the product must not be disposed of with other waste, and instead must be taken to the waste collection points for treatment, collection, recycling and disposal.
The symbol is valid in countries where waste electrical and electronic equipment regulations apply, e.g. “European Directive 2012/ 19/EC on old electronic and electrical appliances”. These regulations define the framework for the return and recycling of old electronic appliances that apply in each country.
As electronic devices may contain hazardous substances, it needs to be recycled responsibly in order to minimize any potential harm to the environment and human health. Furthermore, recycling of electronic scrap helps preserve natural resources.
For additional information on the environmentally compatible disposal of old electrical and electronic appliances, please contact the relevant local authorities, your household waste disposal service or the retailer where you purchased the product.
You can find more information here: www.weee.bosch-thermotechnology.com/
Batteries Batteries must not be disposed together with your household waste. Used batteries must be disposed of in local collection systems.

11 Tips on energy saving
Heating economically The appliance provides a high level of comfort whilst keeping fuel consumption and the environment effects as low as possible. The appliance is controlled in such a way that it delivers heat at the correct rate and only if there is a clear demand from the system.
Central heating systems with thermostatic radiator valves With modern heating systems set around a 20 °C heat loss, the optimum setting for a condensing boiler will be approximately 65 °C for the central heating temperature. This is to ensure a return temperature of less than 52 °C. The system must be balanced correctly and the radiators may need upgrading. This allows the boiler to condense as much as possible for the central heating system. The temperature of each room can be set individually (except primary room with the room thermostat) using the thermostatic radiator valves.
Room thermostats Reducing the setting of the room thermostat by 1 °C can reduce fuel consumption by up to 10%.
New control systems Upgrade your heating control system if necessary with the latest equipment available.
Roof insulation Around 30% of the heat loss from a property is through the roof. Replace any old insulation with new insulation, preferably of around 200mm thickness or more.
Window frames Single glazed windows, particularly those with steel frames, can lose a great deal of heat. Consideration should be given to replacement with PVCu or wooden framed double glazed units.
Radiators If a radiator is sited underneath a window, its performance will be affected if the curtains are allowed to drape over the radiator. Shelves fitted above or in front of the radiator should also be avoided. It is advisable to manually adjust all thermostatic radiator valves every 23 months to prevent them sticking. Ensure radiator valves are correctly set and not damaged.
Draughts Try to ensure that draughts around doors, windows, letter boxes and keyholes etc. are reduced by using a suitable draught excluder.
WARNING
Air vents! Do not block or seal any air vents that are installed to ensure that the
appliance operates safely.
Curtains Lined curtains, or heavier full length curtains can provide excellent insulation. However, always ensure that the curtains do not drape over radiators.

Greenstar 8000 Life 6720883870 (2021/05)

13

Your guarantee
12 Your guarantee
This appliance has a guarantee against faulty materials or workmanship from the date of installation subject to the following terms and conditions: · During the period of this guarantee any components of the appliance
that are proven to be faulty or defective in manufacture will be exchanged or repaired free of charge by Bosch Thermotechnology Ltd. · The householder may be asked to prove the date of installation, that the appliance was correctly commissioned and, where appropriate, serviced to the satisfaction of Bosch Thermotechnology Ltd. These should be documented in the commissioning and service records in the Installation and Maintenance Instructions. · The appliance has been used only for the normal domestic purposes for which it was designed. This guarantee does not affect your statutory rights.
Guarantee registration Your appliance/product carries a guarantee against faulty material or manufacture subject to Terms and Conditions. To read the full Terms & Conditions please visit us on-line at www.worcester- bosch.co.uk/guarantee. Your statutory rights are not affected by the manufacturer’s guarantee

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Greenstar 8000 Life 6720883870 (2021/05)

Energy consumption

13 Energy consumption
The maximum heat output of this boiler can be adjusted to suit the exact requirements of the building. The process of adjusting the maximum heat output is commonly referred to as range rating. The new boiler is set at the maximum output and should be adjusted when it is installed and commissioned. In accordance with the standards, the declared space heating efficiency, useful efficiency and NOx values efficiency for this range rated boiler are not measured at the maximum output. To achieve the published efficiency and NOx values, the gas rate should be reduced by your installer during commissioning ( Installation and Maintenance instructions).

13.1 Product data on energy consumption
The information provided fulfills the requirements of regulations (EU) 811/2013 and (EU) 813/2013. Specific precautions for installation, maintenance as well as recycling and/or disposal are provided within the installation and operating manuals. Read and follow the installation and operating manuals.

Product data

Symbol Unit

Product type

Energy Efficiency Class

Range rated heat output Seasonal space heating energy efficiency at range rated output Annual energy consumption (average climate conditions) Annual energy consumption Sound power level, indoors Special precautions to be taken during assembly, installation or maintenance (if applicable)

Prated kW

s

%

QHE kWH

QHE

GJ

LWA

dB

Condensing boiler

Low temperature boiler

B1 boiler

Cogeneration space heater