Daikin EHYHBH05AFV32 [219/252] Troubleshooting

13 | Troubleshooting

Installer reference guide

219

EVLQ05+08CAV3 + EHYHBH05AF + EHYHBH/X08AF + EHYKOMB33AA

Daikin Altherma hybrid heat pump

4P355634-1F – 2020.10

Error code Cause Possible solution

20, 21, 22,

23, 24

Sensor fault S2 ▪ Check wiring

▪ Replace S2

0 Sensor fault after self-

check

Replace S1 and/or S2

1 Temperature too high ▪ Air in installation

▪ Pump is NOT running

▪ Insufficient flow in installation

▪ Radiators are closed

▪ Pump setting is too low

2 S1 and S2 interchanged ▪ Check cable set

▪ Replace S1 and S2

4 No flame signal ▪ Gas tap is closed

▪ No or incorrect ignition gap

▪ Gas supply pressure is too low or fails

▪ Gas valve or ignition unit is NOT powered

5 Poor flame signal ▪ Condensate drain blocked

▪ Check adjustment of gas valve

6 Flame detection fault ▪ Replace ignition cable and spark plug cap

▪ Replace ignition unit

▪ Replace boiler controller

8 Incorrect fan speed ▪ Fan catching on casing

▪ Wiring between fan and casing

▪ Check wiring for poor wire contact

▪ Replace fan

29, 30 Gas valve relay fault Replace boiler controller