Daikin Altherma EHYHBH05A Series - Symptom: the Burner Ignites Noisily; Symptom: the Burner Resonates

15 | Troubleshooting
Installer reference guide
221
EVLQ05+08CA + EHYHBH05A + EHYHBH/X08A + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1G – 2022.09
Possible causes Corrective action
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 CO₂ setting"[4187].
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 CO₂ setting"[4187].
15.3.12 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
CO₂ setting"[4187].
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)
15.3.13 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 adjustment. See "To check
the CO₂ setting"[4187].