15 | Troubleshooting
Installer reference guide
230
EVLQ05+08CA + EHYHBH05A + EHYHBH/X08A + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1G – 2022.09
Error code Detailed error code Description
UA 00 OU: Indoor/outdoor
combination
problem.
Power reset required.
Error codes of the gas boiler
The controller on the gas boiler detects faults and indicates them on the display by
error codes.
If the LED is flashing, the controller has detected a problem. Once the problem is
rectified, the controller can be restarted by pressing the button.
Following table shows a list of error codes and the possible solutions.
Error code Cause Possible solution
10, 11, 12,
13, 14
Sensor fault S1 ▪ Check wiring
▪ Replace S1
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
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