22
B029
DOES THE FAN
COME ON?
BOILER
SHUTDOWN?
IS THERE POWER
TO THE FAN?
NO
YES
YES
YES
NO
YES
NO
NO
NO
1)Check/replacedifferential
pressureswitch for pump
2)Check/replacewiring
3)Check/replacePCB wire
4)Check/replacepower
supply PCB
5)Check/replacecontrol
PCB
1)
pressureswitch/wiring
2)Check whether reset
button isstuck
3)
detection electrode
Check/replaceair
Check/replaceflame
1)
2)
3)Check/replacepower
supplyPCB
4)
5)
Check/replacewiring
Check/replacePCB wire
Check/replacecontrol
PCB
Check/replaceair
pressureswitch
1)Replacefan
1)Reset theboiler
PUMP
SAFETY DEVICE
ACTIVATED?
INTERNAL
SAFETY DEVICE
FOR PCB
ACTIVATED?
B
C
YES
