12 Troubleshooting
Installation and operation manual
36
EHYKOMB33A
Daikin Altherma hybrid heat pump – gas boiler module
4P353067-1H – 2018.10
12.3.3 Symptom: The burner resonates
Possible causes Corrective action
Gas supply pressure too low. The house pressure switch may
be faulty. Contact the gas
company.
Recirculation of combustion
gasses.
Check the flue gas and the air
supply.
Gas/air adjustment NOT correctly
set.
Check the adjustment. See "To
check the carbon dioxide
setting"on page29.
12.3.4 Symptom: No space heating by the gas
boiler
Possible causes Corrective action
Heat pump error Check the user interface.
Communication problem with the
heat pump.
Make sure the communication
cable is properly installed.
Incorrect heat pump settings. Check the settings in the heat
pump manual.
The service display displays " ",
the gas boiler is switched off.
Switch on the gas boiler with .
No current (24V) ▪ Check the wiring.
▪ Check the connector X4.
The burner does NOT fire on
space heating: sensor S1 or S2
faulty.
Replace sensor S1 or S2. See
"Error codes of the gas boiler"on
page36.
Burner does NOT ignite. See "12.3.1Symptom: The
burner does NOT ignite"on
page35.
12.3.5 Symptom: The power is reduced
Possible causes Corrective action
At high rpm, the power has fallen
by more than 5%.
▪ Check the appliance and flue
system for fouling.
▪ Clean the appliance and flue
system.
12.3.6 Symptom: Space heating does NOT reach
the temperature
Possible causes Corrective action
Weather-dependent setpoint
setting is incorrect.
Check the setting on the user
interface and adjust if necessary.
Temperature is too low. Increase the space heating
temperature.
No circulation in the installation. Check whether there is
circulation. At least 2 or 3
radiators MUST be open.
The boiler power has NOT been
correctly set for the installation.
Adjust the power. See "Maximum
space heating power setting"on
page28.
No heat transfer as a result of
lime scale or fouling in the heat
exchanger.
Descale or flush the heat
exchanger on the space heating
side.
12.3.7 Symptom: No domestic hot water
Not applicable for Switzerland
Possible causes Corrective action
The burner is NOT firing on
domestic hot water: S3 faulty.
Replace S3.
Possible causes Corrective action
The burner does NOT ignite. See "12.3.1Symptom: The
burner does NOT ignite"on
page35.
12.3.8 Symptom: Hot water does NOT reach the
temperature (no tank installed)
Not applicable for Switzerland
Possible causes Corrective action
Domestic hot water flow is too
high.
Adjust the inlet assembly.
Temperature setting for water
circuit is too low.
Increase the domestic hot water
setpoint on the domestic hot
water homepage of the user
interface.
No heat transfer as a result of
lime scale or fouling in the heat
exchanger domestic hot water
side.
Descale or flush the exchanger
domestic hot water side.
Cold water temperature <10°C. The water inlet temperature is
too low.
The domestic hot water
temperature fluctuates between
hot and cold.
▪ The flow is too low. To
guarantee comfort, a minimum
water flow of 5 l/min is
recommended.
▪ Increase the domestic hot
water setpoint on the domestic
hot water homepage of the
user interface.
12.4 Solving problems based on error
codes
When a problem happens, an error code appears on the user
interface. It is important to understand the problem and to take
measures before resetting an error code. This should be done by a
licensed installer or by your local dealer.
This chapter gives you an overview of all error codes and the
content of the error code as it appears on the user interface.
For a more detailed troubleshooting guideline for each error, please
see the service manual.
12.4.1 Error codes: Overview
Error codes of the gas boiler
The controller on the gas boiler detects faults and indicates them on
the display by error codes.
If the LED is flashing, the controller has detected a problem. Once
the problem is rectified, the controller can be restarted by pressing
the button.
Following table shows a list of error codes and the possible
solutions.
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