15 Troubleshooting
Installer reference guide
89
EJHA EHY32AA
Daikin Altherma Hybrid hydrosplit heat pump
4P531180-1 – 2018.06
Possible causes
Corrective action
Weak spark.
Check the ignition gap.
Replace the ignition electrode.
Replace the ignition unit on the
gas valve.
28.3~30.2 mm
a
a
Spark gap (±4.5 mm)
15.4.13 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 carbon dioxide
setting" on page 75
15.4.14 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 (24 V)
▪ 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
page 92
.
Burner does NOT ignite.
burner does NOT ignite" on
page 88
.
15.4.15 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.
15.4.16 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.
Possible causes
Corrective action
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.
space heating power setting" on
page 75
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.
15.4.17 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.
The burner does NOT ignite.
burner does NOT ignite" on
page 88
15.4.18 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.
15.4.19 Symptom: Hot water does NOT reach the
temperature (tank installed)
Possible causes
Corrective action
The gas boiler has an error code. Check the display of the gas
boiler for more information.
The outdoor unit has an error
code.
Check for possible errors on the
user interface.
The 3-way valve is not working
correctly.
▪ Check the installation of the 3-
way valve.
▪ In case of domestic hot water
operation, the flow should be
directed to the tank.
