15.4.13 Symptom: The Burner Resonates; Symptom: No Space Heating By The Gas Boiler; 15.4.15 Symptom: The Power Is Reduced; Symptom: Space Heating Does Not Reach The Temperature - Daikin Altherma EJHA04AAV3 Installer's Reference Manual

Possible causes
Weak spark.
a Spark gap (±4.5 mm)

15.4.13 Symptom: The burner resonates

Possible causes
Gas supply pressure too low.
Recirculation of combustion
gasses.
Gas/air adjustment NOT correctly
set.
15.4.14 Symptom: No space heating by the gas
boiler
Possible causes
Heat pump error
Communication problem with the
heat pump.
Incorrect heat pump settings.
The service display displays " ",
the gas boiler is switched off.
No current (24 V)
The burner does NOT fire on
space heating: sensor S1 or S2
faulty.
Burner does NOT ignite.

15.4.15 Symptom: The power is reduced

Possible causes
At high rpm, the power has fallen
by more than 5%.
15.4.16 Symptom: Space heating does NOT reach
the temperature
Possible causes
Weather-dependent setpoint
setting is incorrect.
Temperature is too low.
EJHA04AAV3 + EHY2KOMB28+32AA
Daikin Altherma Hybrid hydrosplit heat pump
4P531180-1 – 2018.06
Corrective action
Check the ignition gap.
Replace the ignition electrode.
Replace the ignition unit on the
gas valve.
a
Corrective action
The house pressure switch may
be faulty. Contact the gas
company.
Check the flue gas and the air
supply.
Check the adjustment. See "To
check the carbon dioxide
setting" on page 75.
Corrective action
Check the user interface.
Make sure the communication
cable is properly installed.
Check the settings in the heat
pump manual.
Switch on the gas boiler with .
▪ Check the wiring.
▪ Check the connector X4.
Replace sensor S1 or S2. See
"Error codes of the gas boiler" on
page 92.
See "15.4.11 Symptom: The
burner does NOT ignite" on
page 88.
Corrective action
▪ Check the appliance and flue
system for fouling.
▪ Clean the appliance and flue
system.
Corrective action
Check the setting on the user
interface and adjust if necessary.
Increase the space heating
temperature.
Possible causes
No circulation in the installation.
The boiler power has NOT been
correctly set for the installation.
No heat transfer as a result of
lime scale or fouling in the heat
exchanger.

15.4.17 Symptom: No domestic hot water

Not applicable for Switzerland
Possible causes
The burner is NOT firing on
domestic hot water: S3 faulty.
The burner does NOT ignite.
15.4.18 Symptom: Hot water does NOT reach the
temperature (no tank installed)
Not applicable for Switzerland
Possible causes
Domestic hot water flow is too
high.
Temperature setting for water
circuit is too low.
No heat transfer as a result of
lime scale or fouling in the heat
exchanger domestic hot water
side.
Cold water temperature <10°C.
The domestic hot water
temperature fluctuates between
hot and cold.
15.4.19 Symptom: Hot water does NOT reach the

temperature (tank installed)

Possible causes
The gas boiler has an error code. Check the display of the gas
The outdoor unit has an error
code.
The 3-way valve is not working
correctly.
15 Troubleshooting
Corrective action
Check whether there is
circulation. At least 2 or 3
radiators MUST be open.
Adjust the power. See "Maximum
space heating power setting" on
page 75.
Descale or flush the heat
exchanger on the space heating
side.
Corrective action
Replace S3.
See "15.4.11 Symptom: The
burner does NOT ignite" on
page 88.
Corrective action
Adjust the inlet assembly.
Increase the domestic hot water
setpoint on the domestic hot
water homepage of the user
interface.
Descale or flush the exchanger
domestic hot water side.
The water inlet temperature is
too low.
▪ The flow is too low. To
guarantee comfort, a minimum
water flow of 5 l/min
recommended.
▪ Increase the domestic hot
water setpoint on the domestic
hot water homepage of the
user interface.
Corrective action
boiler for more information.
Check for possible errors on the
user interface.
▪ Check the installation of the 3-
way valve.
▪ In case of domestic hot water
operation, the flow should be
directed to the tank.
Installer reference guide
89
is