Observation:


Please select appropriate fault code:
10, 11, 12, 13, 14 Sensor fault S1 (Flow)
20, 21, 22, 23, 24 Sensor fault S2 (Return)
0 Sensor fault after self-check
1 Temperature too high
2 S1 and S2 interchanged
4 No flame signal
5 Poor flame signal
6 Flame detection fault
8 Incorrect fan speed
29, 30 Gas valve relay faulty