![background image](http://html.mh-extra.com/html/daikin/altherma-chyhbh05af/altherma-chyhbh05af_installers-reference-manual_501230187.webp)
13
|
Troubleshooting
Installer reference guide
187
C08AF + EHYKOMB33A
Daikin Altherma R Hybrid
4P471761-1E – 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