DEWHOT ND12CTDH Constant Temperature Gas Geyser Instruction Manual

ND12CTDH Constant Temperature Gas Geyser

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Specifications

• Description: 12L Constant Temperature Gas Geyser
• Model no: NDCT12DH Type B
• Gas type: LPG
• Max gas pressure: 2.8kpa
• Rated input: 24kw
• Water pressure: 20-500 kPa
• Maximum Water Flow: 12L/min
• Max Gas Consumption: 1.44kg/h
• Unit Size: 680 x 345 x 180mm
• Gross Weight (GW): 11.2kg
• Net Weight (NW): 9.6kg

Product Usage Instructions

Installation

Install the gas geyser indoors with a flue to ensure proper
ventilation.

Gas Supply

Connect the gas geyser to an LPG cylinder. Do not tamper or
modify the appliance.

Gas Smell

If you smell gas, follow these steps:

1. Turn off the gas supply at the bottle
2. Extinguish all naked flames
3. Do not operate any electrical appliances
4. Ventilate the area
5. Check for leaks as described in the manual
6. If gas smell persists, contact your dealer or gas supplier
   immediately

Burn-back

In case of burn-back, turn off the gas supply, ensure the flame
is extinguished, wait for 1 minute, and then reignite. If burn-back
occurs again, contact a registered LPG installer.

Gas Pressure Regulator

Install a LPG regulator that complies with SANS 1237
requirements and provides an operating pressure of 2.8 kpa.

Frequently Asked Questions (FAQ)

Q: Can the gas geyser be used with other gas types?

A: No, this appliance is designed to operate on LPG only.

Q: How can I register my product for guarantee purposes?

A: After installation, register your product on the Dewhot
website using your invoice and Certificate of Compliance (COC).

Q: What should I do if the flue is blocked?

A: The geyser will automatically turn off if the flue is
blocked. Ensure proper installation with a flue to prevent this
issue.

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12L Constant Temperature Gas Geyser
Type B – ND12CTDH
Install indoors with a flue

Read these instructions carefully before operating the gas geyser and familiarize yourself with the appliance before connecting it to the gas cylinder. Keep these instructions for future reference.

This appliance is manufactured to operate on LPG only. Do not tamper or modify the appliance.

Important

If you smell gas
1. Turn off the gas supply at the bottle 2. Extinguish all naked flames 3. Do not operate any electrical
appliances 4. Ventilate the area 5. Check for leaks as described in this
manual 6. If gas smell persists, contact your
dealer or gas supplier immediately
Burn-back
In the event of a burn-back, where the flame burns back to the jet, immediately turn the gas supply off at the gas cylinder. After ensuring the flame is extinguished, wait for I minute and then reignite the appliance as per normal. Should the appliance burn back again, close the gas cylinder and call a registered LPG installer.

Do not use the appliance again until the installer has confirmed that it is safe to do so.
Gas-pressure regulator
This appliance requires an operating pressure of 2,8 kpa. Only install a LPG regulator that complies with the SANS 1237 requirements.
Guarantee
After installation, please register your product on the Dewhot website (www. gasgeysers.co.za/product-registration) You will need your invoice and Certificate of Compliance (COC) to complete the registration.

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Parts Diagram
Controller box LCD
screen
Pilot assembly
Pilot jet
Pilot tube
Gas valve Battery
Box
Jet Bar Test Point
Burner Washer
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LCD screen
Burner
Dewhot | Gas geyser manual

Cover 850 C Temp sensor 1100 C Temp sensor Outlet Temp sensor Chimney box
Radiator

Inlet Temperature sensor Water flow sensor Inlet water valve
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Technical parameters

Description Model no Model Gas type Max gas pressure Rated input Water pressure Maximum Water Flow Max Gas Consumption Unit Size GW 11.2kg

Constant temperature NDCT12DH Type B LPG 2,8kpa 24kw 20-500 kPa 12L/min 1.44kg/h 680 x 345 x 180mm NW 9.6kg

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Functions & Features

CONSTANT HOT WATER SUPPLY
The water heater will achieve and maintain the water temperature set on the digital display automatically, irrespective of changing water flow and temperatures.
TEMPERATURE MEMORY FUNCTION
The CPU of the controller will remember the temperature settings from the previous use, improving the reaction time upon start up.
EASY OPERATION
Simplicity of adjusting the temperature of the hot water by 1°C increments at the touch of a button.
PILOT IGNITION
The pilot burner will automatically ignite first, then the main burner. The pilot will then go off avoiding excessive gas usage.
FLUE BLOCKAGE PROTECTION
The geyser turns off automatically if the flue is blocked. Whether it is installed indoors or outdoors the geyser should be fitted with a flue to avoid unneccesary cutting off.
CAN BE USED TO BACK UP SOLAR GEYSERS
Use this gas geyser in conjuction with our solar to gas valve to boost your solar water temperature in the winter months or colder, cloudier summer days.

FLAME OUT SENSOR
This is designed to automatically cut off the gas supply should the flame/ burner unexpectedly extinguish or the sensor no longer detects a flame.
LOW WATER PRESSURE START UP
The appliance will activate from a water flow of 3lt/min. This makes it suitable for low water pressure applications.
OVER PRESSURISATION/ FREEZING PROTECTION
The appliance will automatically protect itself by releasing pressure if the water supply is over 10 Bar (this should be manually set to lower pressures see page 13).
SUITABLE FOR INDOOR AND OUTDOOR INSTALLATION
This geyser can be installed indoors (with correct ventilation) or outdoors increasing installation options.
AUTOMATIC GAS ADJUSTMENT
The appliance will automatically adjust its gas usage depending on the water usage, using less gas when you use less water, making the appliance more efficient.

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Appliance Safety instructions

PROPER VENTILATION
To avoid the risk of fire, explosion, or asphyxiation never operate the gas geyser unless it is installed properly and has adequate air supply. Make sure the flue terminal is installed properly for the initial start-up, check it annually thereafter.
FLAMMABLE MATERIALS
DO NOT handle, use or store combustible materials near to the gas geyser.
WEATHER BOX AND FLUE
For indoor or outdoor installation this geyser should be installed with a flue. For any outdoor installation a weather box should be installed with a flue.

WATER TEMPERATURE SETTING
Safety and energy savings need to be considered when setting the water temperature . Water temperatures above 52°C can cause severe burns. Refer to page 16.
1. Households with small children, disabled or elderly people need to set the temperature to 49°C or lower
2. Maximum water temperature occurs when the burner is on. To see the water temperature look at the front control panel of the gas geyser.
3. The Factory default water setting is 41°C and this setting can be adjusted on the control panel.
4. The gas geyser has a heating range between 38°C and 60°C.

TIME/TEMPERATURE EXPOSURE RESULTING IN BURNS
Hot water can create severe burns, we should rarely exceed the temperatures below

49°C 52°C 55°C 57°C 60°C 63°C 66°C 69°C

More than 5 minutes 1.5 to 2 minutes +/- 30 seconds +/- 10 seconds less than 5 seconds less than 3 seconds +/- 1.5 to 2 seconds +/- 1 second

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NATURAL AND LP GAS
Both LP and natural gas are odoured to help detect leaks.
Appliances using LP gas are different from natural gas models. A natural gas geyser can not function safely on LP gas and vice versa.
Do not try to convert the gas geyser from a natural gas to a LP gas appliance and vice versa. This could damage the appliance, cause injuries or fires. Never connect the gas geyser to a fuel type that is not in accordance with the appliance’s data table.
WHEN DETECTING A LEAK ON YOUR INSTALLATION
LP gas is twice as heavy as air and may accumulate in low lying areas and cavities.
Before opening the hot water tap to test your gas geyser have your installer check all gas fittings and connections. Bubbles indicate a leak.
1. Do not attempt to find the cause yourself and turn off the gas supply in finding a leak.
2. Do not ignite any appliance. 3. Do not touch any electrical switch. 4. Evacuate the house immediately with
your family and pets.

5. Leave the doors open for ventilation and contact the gas supplier, registered LP Gas Installer or Fire Department.
6. Stay away from the house (or building) until the service call has been made, the leak is fixed and the space has been declared as safe.
7. Ask the installer to show you where the gas shut-off valve is and how to use it.
8. Turn off the manual shut-off valve if the gas geyser has been subjected to overheating, fire, flood, physical damage or if the gas supply fails to shut off.
Gas detectors are highly recommended and they must be installed in accordance to the detector manufacturer’s regulations.
GAS SUPPLY
1. The gas type should match the specification table. This is a low pressure gas applinace and the appropriate regulator should be used.
2. Ensure there is sufficient gas pressure (2,8kPa) for the gas supply.
3. The gas line should be equipped with a shut off valve.
4. At least a soapy solution must be used to check all connections and fittings for gas leaks.
5. The COC should be issued and signed after the installation has been inspected.

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Installation instructions

LFLUES AND COVERS
· The gas geyser should be installed with a 110mm solid or flexble flue and the applinace should be close to the flue termination to avoid unnecessary elbows and excessive flue length. A flue cowl should be used if installed outdoors to prevent rain from entering the geyser.
· Venting must be installed as outlined in SANS 1539.
· Make sure the flue terminal is installed properly with all parts of the flue facing upward to allow hot air to escape. Always use a cowl if the flue is installed outdoors.
· The flue will expell warm air and water vapour, do not install the terminal of the flue near areas/objects that can be damgeded from the above or are combustible. (see gas geyser location)
MOUNTING THE GAS GEYSER
Install the appliance in a place that allows for easy access for future servicing and replacing batteries.
Use at least 8mm concrete plugs and screws to mount the gas geyser to the wall. In the case of dry walling use dry wall anchors.

WATER SUPPLY
This appliance must only be used with the following water supply requirements:
1. Clean, potable water free of corrosive chemicals, sand, dirt, or other contaminants.
2. With inlet water temperatures above 0°C, but not exceeding 45°C
3. Free of lime and scale deposits
4. DO NOT reverse the hot and cold water connections, this will not allow the gas geyser to function.
GAS GEYSER LOCATION
1. Close to flue the extraction area . 2. Protected from freezing temperatures. 3. Clear 800mm of space from
combustible surfaces. 4. Sufficiently ventilated. 5. Free of corrosive elements and flammable
vapours. 6. Have sufficient space to service the
appliance. 7. It should be securely mounted to the wall. 8. Installed at least 1400mm off the ground.

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VENTILATION REQUIREMENTS
Ventilation required for this gas water heater is two vents of 3cm2 per Mj of gas consumption. This equates to a total of two vents of 218cm2 each – one installed at high level and one at low level.
WATER SUPPLY CONNECTIONS
Plumbing should be carried out by a qualified plumber. Use approved plumbing materials only. The diameter of the pipe lines should be a minimum of 1/2″ copper or pex piping.
To conserve energy and to prevent freezing, insulate both the cold and the hot water supply lines. DO NOT cover the drain valves.
WATER PRESSURE GUIDELINES
Operation of the gas geyser requires a minimum water pressure of 14 psi (0,5 Bar) and a minimum water flow rate of 2.5 Litres/min.

1. For long pipe runs water pressure can drop and additional water pressure may be required.
2. When the water is supplied from a water tank, the height of the tank, the diameter of the pipes and their relation to water pressure, should be taken into consideration.
3. For gravity fed water 5 meters head is a minimum requirement.
GAS SUPPLY LEAK TESTING
1. The gas geyser and its gas connections must be tested for leaks at the normal operating pressures before using it.
2. Turn on the gas shut-off valve(s)
3. Use the soapy water solution to test for leaks at all connections and fittings. Bubbles indicate a gas leak that must be fixed.
4. Once the appliance is operating, the factory connections also need to be tested for leaks.

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WARNING
Never use an open flame to test for gas leaks as this could result in property damage, personal injury and or death.
VENTING/FLUEING
DO NOT connect the gas geyser to an existing vent or chimney, it must be vented/flued separately from any other appliances.
When installing a gas geyser a minimum of 1 meter is required from any venting system.
DRAINING THE CONDENSATION IN THE FLUE
In cold conditions, installations with long horizontal or vertical runs may accumulate condensation in the flue, install condensation traps and drains to avoid water from going back into the gas geyser.
IMPORTANT TIPS
If the water flow is too slow, the gas geyser will not ignite. Keep the shower head/outlets clean from debris that reduces flow rate.

municipal water feeds. Install a shutoff valve near the inlet of the gas geyser for service and draining purposes.
Installation of demountables is recommended on the hot and cold water lines, so that the gas geyser may easily be disconnected for servicing.
Install a non-return on the outlet of the gas geyser to prevent water hammer.
Do not solder the HOT or COLD water connections near to the gas geyser. If solder connections are to be used, solder the fitting to the adapter before fitting the adapter to the water connections on the geyser. Any heat applied to the water supply fittings will permanently damage the internal components of the gas geyser.
Hot water outlet connections between the gas geyser and the usage points should be as short as possible.
DO NOT use lead or plastic pipe. To save energy and reduce heat loss we recommend insulating the water piping.
NOTE The flow rate of hot water may vary when more than two taps or fixtures are being used at the same time.

To keep the water pressure balanced add a 400-600kpa pressure regulating valve on the cold water supply for

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Installation saftey instructions

1. Inspect the gas pipes and flexible hoses regularly. If you find joints that are not tightly secured or if there are cracks, you should stop using the appliance and perform the necessary maintenance.
2. Turn off the gas shut-off valve if your gas geyser has been subjected to over heating, fire, flood, physical damage or if the gas supply fails to shut off.
3. Do not allow combustible materials such as newspaper, rags or mops to accumulate near the appliance.
4. Do not store or use petrol or other flammable vapours and liquids, such as adhesives or paint thinners, in the vicinity of this or any other gas appliance. If such flammables must be used, open doors and windows for ventilation.
5. Appliances in the vicinity should be shut off to avoid vapours igniting from the gas burner. Flammable vapours can be drawn by air currents from surrounding areas to the inlet of gas geyser.

ADJUSTING THE OVER PRESSURISATION VALVE (OPV) FOR FREEZING TEMPERATURES
When you have done a new installation and have connected the water, then you can use a small or medium flat screw driver to UNSCREW the grubscrew in the hollow centre of the over-pressurisation valve until the water drips out.
Then screw it BACK IN 1 full turn. This will mean that the over-pressurisation valve is set to the your specific water pressure supply and in the event of the water in the pipes freezing the valve will push out a small amount of water and allow the water to freeze in the geyser without causing damage.

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Operating instructions

1. Open the battery box underneath the geyser and insert one D cell battery, paying attention to polarity
2. Open the cold water valve that has been installed on thwe cold water inlet pipe or turn on the main water supply. Open the hot water tap which your new geyser now feeds. You should hear the water flowing through the geyser, if the batteries are installed correctly you will hear the geyser start to ignite if the gas does not come through it will turn itself off ­ this is one cycle. To initiate another cycle turn the tap off and then back on again.
3. You can now open the gas cylinder and any gas shut off valves installed on the gas line. There may be an air lock inside the gas line especially for gas piping which is longer than three to five meters. To get rid of this airlock you will have to run the geyser through multiple cycles until the gas reaches the burners, it will then ignite. should this not work after three cylces use the gas bleeder valve to bleed the gas through.
4. You can adjust the temperature of

your new gas geyser by using the digital control panel
5. Try setting your gas geyser between 40-45 degrees Celsius. You should not need to add “much” cold water if any at all. This way you are maximizing your efficiency by not using more gas than you need to by overheating the water. For longer runs in water pipe you may need to make this temperature slightly higher.
6. This gas geyser may only be installed in a room where that room meets the specific ventilation requirements of SANS 10087:1. If you are unsure please call the Dewhot offices to clarify.
7. Ventilation required for this gas water heater is two vents of 3cm2 per Mj of gas consumption. This equates to a total of two vents of 218cm2 each one installed at high level and one at low level.
8. This gas geyser must be connected to a flue to evacuate the combustion products to the outside of the building. If the gas geyser is installed outdoors it

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Operating warnings

· Don’t use the gas geyser in a sealed room or room with no air circulation (see ventilation instructions on page 12).
· If you find a gas leak, turn off the gas valve immediately. If the room smells of gas, turn off the gas water heater and do not touch any electrical appliances or switches or turn on any hot or cold water taps. Call your installer immediately to determine the fault.
· When leaving the premises for extended periods, turn off your gas supply and turn off the gas geyser in the event of a hot water leakage the geyser will not turn on.

· Do not put any foreign objects in the exhaust port, air inlet or on top of the gas geyser to avoid incomplete combustion which results in posioning.
· Should you notice a yellow flame which indicates abnormal combustion you should close the gas valve right away and then contact the installer.
· Before outdoor temperatures reach below zero degrees make sure the remaining water is emptied out of the gas geyser to avoid it freezing (Set your OPV refer to page 13).

· The body of the gas geyser can get hot during operatuon, do not touch any part of the gas geyser, except for the control panel

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Water Temperature settings

The gas geyser temperature can be regulated by adjusting the setting on the front of the control panel. Safety factors should be considered so please read and follow the warnings outlined on page 8.
Mixers can be used to adjust the temperature at the water outlet.
When the burner is switched on, maximum water temperatures are reached. The water temperature is determined by turning on a hot water tap. Water temperatures at the tap will vary depending on the weather and length of piping from the gas geyser, the longer the run in pipe the cooler the water will come out of the shower head.
Set the temperature as required by pressing the UP or down arrows on the temperature button (also see page 17).
By pressing the UP or DOWN you buttons will adjust the temperature point by 1°C increments.

ON/OFF UP DOWN

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SETTING YOUR GAS GEYSER TO THE CORRECT TEMPERATURE
The gas geyser should be set to such a temperature that you should not have to add too much cold water. If you set the temperature too high and have to cool it down using the cold water, you have effectively wasted gas. Try set the geyser so that you only have to open the hot water tap only.
Start by setting the geyser to 42°C for pipe runs shorter than 3m. If your pipe runs are from 3-5m try setting the geyser at 43°C and for pipe runs longer than 5m try setting the geyser at 45°C. If you find these temperatures are not satisfactory then increase the temperature by 1-2°C at time until you feel the water is hot enough.
The hottest water temperature will be from the hot water tap closest to the gas geyser.
Always remember to test the water temperature with your hand before use and remember that hotter water settings increase the risk of injury.
The gas geyser is fitted with a device that will shut off the gas supply to the burner

if the appliance exceeds normal operating temperatures at about 75 °C
The appliance won’t operate with a water flow of less than 3 litres/minute. If this occurs, increase the water flow.
A GUIDE LINE OF SHOWERING TEMPERATURES
Body temperature: 35-37 °C
Summer time comfortable showering temperatures: 35-38°C
Warm shower in winter: 39°C
Hot showering temperature in winter 42°C (most preferred showering temperature)
Very hot showering temperature in winter: 44°C
For a bath temperature in winter: 48-50°C
Bare in mind a geyser showing 40°C will not be the same temperature at the shower head as it will loose heat travelling through the pipes, the further the run in pipes the more heat will be lost. Also bare in mind the slower the flow rate the more heat will be lost through the pipes as the water spends more time travelling to the shower loosing greater amounts of heat.

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Maintenance and cleaning

GENERAL MAINTENANCE
If your gas technician maintains your gas geyser you should not have any issues with it for years.
We recommend that you periodically check the burner, relief valve, water filter and flue system.
This needs to be done by a certified installer. A maintenance program is advisable.
1. Inspect the area around the gas geyser to ensure that its in a safe operating environment.
2. Make sure that the appliance has not been damaged. If there are traces of damage or denting contact your supplier to check that the appliance is still functioning properly.
3. Check for any abnormal sounds while operating your appliance. A light humming sound is normal from time to time. Check for gas/ water leaks.
4. The cold water supply filters should be cleaned once a year.
5. Perform regular maintenance on the

geyser to prevent carbon monoxide dangers, excessive hot water temperatures or other potentially hazardous conditions.
DO NOT
1. Continue to use the gas geyser if you feel that there is something wrong with it.
2. 3. Allow children to operate or handle
the appliance.
After you have checked, maintained and/ or cleaned the appliance, make sure that it is working properly by turning on the hot water tap.
COASTAL CORROSIVE ENVIROMENTS
For geysers installed near the coast, get your gas installer to remove the cover and spray electrical contact cleaner on all the electronic contacts, after the electrical spray has dried up you can spray Q30 or any other kind of electrical sealant to seal the joins and prevent corrosion from entering the electronics. This is highly advised and can be performed at any location inland or coastal. Do not perform this step if the geyser is on.

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GENERAL CLEANING

CAUTION

1. Clean the appliance and remote control by using a damp soft cloth only. Gently wipe the surfaces of the appliance and any remaining moisture with a dry soft cloth.
2. Do not store household items near or on top of the appliance
3. inlet water filters should be cleaned on a regular basis.
4. DO NOT scrub the appliance with a brush.
5. Use only water, any chemicals can damage the surface of the appliance.
6. DO NOT remove any labels, including the rating table when cleaning or servicing.
7. DO NOT splash water on the remote controls when cleaning.
CLEANING THE WATER FILTER
· Turn the appliance off · Turn the water supply to the
appliance off. Unscrew the water fitting and pull the filter out. · Remove particles – use a soft brush and rinse it with running water. · Put the filter back and screw it in · Turn on the second the cold water supply.

Cleaning of the main burner should always be performed by Registered LPG Installer.
A compressor can be used to clean the burner.
BURNER INSPECTION
Visually check the main burners annually.
Use the sight glass to check the flame picture, the flame should be a clean blue flame only.
If a yellow flame occurs, the gas geyser should be shut down and you should call a qualified installer to assess the appliance.
Check to make sure that the air supply and the vent terminal have not been blocked or contain debris.
VACATION AND EXTENDED SHUT-DOWN
If the gas geyser is left for an extended period of time, the power and gas to the appliance should be turned off.
The gas geyser and piping should be drained if they could be subjected to freezing temperatures over this period. After a long shut-down period, the gas geyser needs to be serviced and checked.

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Symptoms and faults

Symptom
Pilot comes on but ignitor continues to tick
The pilot is firing and firing but does not take a flame, an E1 error comes up and there is a faint smell of gas

FAULT
Partially blocked pilot tube – the flame out sensor is not in the flame
faulty flame out sensor
or after heavy rain the controller can be wet, this will sort itself once dried off
Check the pilot flame tube is not blocked or partially blocked by a spiders web, remove tube and clean it out, always check the pilot jet at the same time

Unit fires continuously without a flame coming on or showing an error
Faint firing and PA, BA or 6A comes up on the screen
The geyser flame comes on and runs up to temperature then drops away and tries to re-ignite. The process repeats and either no error comes up on the screen or an E8 error is shown
Only 35-38 degrees reached on the LCD screen

Faulty controller
Flat batteries
LCD panel is faulty or the control box is wet normally after a storm Wait at least a day for the unit to dry before lodging a service call
The water flow may be too high, reduce it and place a 400kPa pressure reducing valve on the cold water line The regulator may be undersupplying gas, Check the gas inlet pressure is operating at 2,8 kPa while the applinace is running

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Symptom
The units temperature jumps all over the place, from 65-35, is sometimes consistent but mostly not
The unit will fire and the pilot will take but not the main burner and there is no smell of gas
Unit suddenly goes cold during use

FAULT
Flow sensor may be faulty, but this can be intermittent in its function- the pilot may fire again when the temperature should be coming down
Loom to gas is faulty
The gas section is faulty, check the first and second stage solenoids with a voltmeter
Batteries may be flat
Regulator is delivering too high a gas pressure, unit shuts off, hence cold water

Unit resets to 45 degrees

The geyser needs a PRV on the cold water supply as inconsistent and high water pressure spikes can cause it to reset
The pre-set temperature is too high for the geyser to achieve and after a day or two of trying will re-set to factory setting 45 deg

Unit fires and dies, fires and dies, fires and dies four times in a row then fails totally

Gas section wiring loom is faulty

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Error code guide

WHEN AN ERROR CODE IS DISPLAYED

IF THE ERROR CODE IS STILL SHOWN

· Close the hot water tap, turn off the appliance and remove the battery.
· Wait for about 2 minutes before turning it on again.

· Turn off the hot water tap and turn off the switch on the LCD.
· Take note of the error code displayed and call the Dewhot Technical Service number.

· Open the hot water tap.

CAUTION

IF THE ERROR CODE REMAINS SHOWN
· Close the hot water tap and turn off the switch on the LCD screen.
· Take the proper action shown below and attempt operation of the appliance again.

· For your safety DO NOT attempt to repair any part of the gas geyser or installation. Only a Registered LPG Installer should do this.
· Turn off the power to the gas geyser before removing protective cover.

Do not place any form of magnetized tool near the flow sensor, this will damage it permananetly- remove the
battery when working on or near the flow sensor

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Error

Solution

Check the gas inlet pressure is operating at 2,8 kPa while the applinace is running;

Accidental flameout, the flame sensor could

check the gas valve is supplying 2,8kPa to the burners while the applinace is running on maximum

EO not detect the flame

temperature;

signal within 7s after the re-ignition process

Check whether the flame sensor is damaged or the connection wire is pulled off

Change the diaphragm valve or controller

No flame signal detected within 60s on the pilot flame E1 No flame signal detected within 10s on the main burner

Check the gas inlet pressure is operating at 2,8 kPa
Check whether the flame sensor is damaged or the connection wire is pulled off
Check whether the pilot gas supply pipe is twisted and blocked or cracked creating a leak
Check for bugs or spiders in the pilot burner tube Change the diaphragm valve or controller

E2 20 min shut off

Normal operation, close and re-open the tap

Flame signal detected Check the gas inlet pressure is operating at 2,8 kPa
E4 without any water Change the gas valve and perform a pressure test
flow

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Error

Solution

Check whether the water temp. sensor is

Faulty/damaged or

E5

unplugged output

unplugged, damgeded or burnt

water temp sensor

Change the sensor

Short circuit of the outlet water temperature sensor E6
Temperature of hot water has exceeded 85°C

Check the gas pressure does not exceed 2,8 kPa at the gas inlet
Water pressure suddenly dropped, causing a temperature spike (check the flow rate is above 3lt/ min with the bucket test)
Change the radiator water temp. sensor for an 85°C sensor;
Change the outlet temp. sensor
Change the diaphragm valve or controller

It is normal if it is the first time operation or the appliance has been left unused for a long time;

The gas flow is

Change the batteries for new batteries;

E7

unstable, and has switched off 5

Check the gas inlet pressure is operating at 2,8 kPa

times continuously while the applinace is running

Change the diaphragm valve or controller

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Code E8 EA

Error
Water flow capacity is less than 3L/ min – open circuit of the over heat temperature sensor
Open circuit of input water temperature sensor

Solution
Check the gas inlet pressure is operating at 2,8 kPa while the applinace is running
Water pressure suddenly dropped, causing a temperature spike (check the flow rate is above 3lt/min with the bucket test)
Change the gas valve or controller Check whether the wire of input water temp sensor is pulled off, burnt or damaged
Change the input water temperature sensor

Change the loom to gas valve

One of the 2 CPUs

Change the loom to LCD

EB

of the controller is

damaged

Change the LCD screen

Change the controller

Controller EE
malfunction

Change the controller

LED FLASH

The batteries are flat

Change the batteries

PA

BA

Low battery

6A

Change batteries

Dewhot | Gas geyser manual

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Only a registered gas installer can install your gas geyser and must comply to SANS 10087-1

User
This appliance may only be installed by a registered LPG installer.
Registered installers are issued with a card that displays their registration number. Insist on seeing this card and make a note of their registration number.
When they have finished their installation make sure the installer performs an operational and safety briefing.
Before you sign off the installation, make sure you also receive your COC

Installer
This appliance may only be installed by a LPG Installer registered with the South African Qualification and Certification Committee (SAQCC). The appliance must be installed in accordance with the requirements of SANS 10087-l for use with LPG and or any fire department regulations and/or local bylaws applicable to the area.
If in doubt, check with the relevant authority before continuing with the installation. Once an installation is complete you are required to brief, in full, the operational and safety functions of the unit.

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Dewhot | Gas geyser manual

Dewhot | Gas geyser manual

Page 27 of 28

Register your product
warrantyportal.dewhot.com
Track your product journey by registering your profile and products on our portal. This will also give you the ability to log faults, view terms & procedures or talk
to a technician
The Dewhot Difference
We care, we share, we evolve

Dewhot | Gas geyser manual

Page 28 of 28

References

• dewhot

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