11 Troubleshooting; General Guidelines; Precautions When Troubleshooting; Solving Problems Based On Symptoms - Daikin Altherma EHY2KOMB28AA Installation And Operation Manual

11 Troubleshooting

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
Gas tap is closed.
Air in the gas tap.
Gas supply pressure too low.
No ignition.
No spark. Ignition unit on gas
valve faulty.
Gas/air adjustment NOT correctly
set.
Fan faulty.
Fan dirty.
Gas valve faulty.
Installation and operation manual
34
Corrective action
Open the gas tap.
Remove air from the gas pipe.
Contact the gas supply company.
Replace the ignition electrode.
▪ Check the cabling.
▪ Check the spark plug cap.
▪ Replace the ignition unit.
Check the adjustment. See "To
check the carbon dioxide
setting" on page 28.
▪ Check the wiring.
▪ Check the fuse. If necessary,
replace the fan.
Clean the fan.
▪ 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
Gas supply pressure too high.
Incorrect ignition gap.
Gas/air adjustment NOT correctly
set.
Weak spark.
a Spark gap (±4.5 mm)
11.3.3

Symptom: The burner resonates

Possible causes
Gas supply pressure too low.
Recirculation of combustion
gasses.
Gas/air adjustment NOT correctly
set.
11.3.4 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.
Daikin Altherma hybrid monobloc – Gas boiler module
Corrective action
The house pressure switch may
be faulty. Contact the gas
company.
▪ Replace the ignition pin.
▪ Check the ignition electrode
gap.
Check the setting. See "To check
the carbon dioxide setting" on
page 28.
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 28.
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 35.
See "11.3.1 Symptom: The
burner does NOT ignite" on
page 34.
EHY2KOMB28+32AA
4P538953-1 – 2018.06