| 29
Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
8.6 A7 Error (Abnormal Operation: Gas Valve Relay)
Error Description
Gas valve relay error It occurs when the gas valve relay which is mounted on PCB is stuck closed.
Checkpoint Replace the contr
ol board
Figure 23
8.7 A8 Error (Abnormal Operation: Gas Valve)
Error Description
Flame after combustion This error occurs if fl ame is detected after burner had shut off .
Checkpoint
Chec
k the operation condition of the gas valve
Whether the flame rod is damaged or not
Whether the flame rod comes into contact with the metal burner or not
Table 29
Figure 24
Replace the control board
Replace the flame rod
Replace the gas valve
Combustion stop
Separate the flame rod wire
and attempt operation again
Combusted
Check
if the gas valve is
closed
Check if
the flame rod is
damaged or not
Ye s
Ye s
No
No No
Ye s
To Next Page
Loading...
Need help?
General