11 Troubleshooting
Installation and operation manual
34
EHY32AA
Daikin Altherma hybrid monobloc – Gas boiler module
4P538953-1 – 2018.06
11
Troubleshooting
11.1
General guidelines
Before starting the troubleshooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
11.2
Precautions when troubleshooting
WARNING
▪ When carrying out an inspection on the switch box of
the unit, ALWAYS make sure that the unit is
disconnected from the mains. Turn off the respective
circuit breaker.
▪ When a safety device was activated, stop the unit and
find out why the safety device was activated before
resetting it. NEVER shunt safety devices or change
their values to a value other than the factory default
setting. If you are unable to find the cause of the
problem, call your dealer.
DANGER: RISK OF ELECTROCUTION
WARNING
Prevent hazards due to inadvertent resetting of the thermal
cut-out: power to this appliance MUST NOT be supplied
through an external switching device, such as a timer, or
connected to a circuit that is regularly turned ON and OFF
by the utility.
DANGER: RISK OF BURNING
11.3
Solving problems based on
symptoms
11.3.1
Symptom: The burner does NOT ignite
Possible causes
Corrective action
Gas tap is closed.
Open the gas tap.
Air in the gas tap.
Remove air from the gas pipe.
Gas supply pressure too low.
Contact the gas supply company.
No ignition.
Replace the ignition electrode.
No spark. Ignition unit on gas
valve faulty.
▪ Check the cabling.
▪ Check the spark plug cap.
▪ Replace the ignition unit.
Gas/air adjustment NOT correctly
set.
Check the adjustment. See
"To
check the carbon dioxide
setting" on page 28
.
Fan faulty.
▪ Check the wiring.
▪ Check the fuse. If necessary,
replace the fan.
Fan dirty.
Clean the fan.
Gas valve faulty.
▪ Replace the gas valve.
▪ Re-adjust the gas valve, see
"To check the carbon dioxide
setting" on page 28
.
11.3.2
Symptom: The burner ignites noisily
Possible causes
Corrective action
Gas supply pressure too high.
The house pressure switch may
be faulty. Contact the gas
company.
Incorrect ignition gap.
▪ Replace the ignition pin.
▪ Check the ignition electrode
gap.
Gas/air adjustment NOT correctly
set.
Check the setting. See
"To check
the carbon dioxide setting" on
page 28
.
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)
11.3.3
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 page 28
.
11.3.4
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 (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 35
.
Burner does NOT ignite.
See
"11.3.1 Symptom: The
burner does NOT ignite" on
page 34
.
