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B063
IS THE FAN
RUNNING?
BOILER
SHUTDOWN?
POWER
TO FAN?
NO
YES
YES
YES
NO
YES
NO
NO
NO
YES
1 - Check/replace main
circuit flow switch
2 - Check/replace
connection cable
3 - Check/replace P.C.B.
1 - Check/replace air
pressure switch
2 - Check if reset button
is jammed
3 - Check/replace flame
detection electrodes
1 - Check/replace
connection cable
2 - Check/replace P.C.B.
3 - Check/replace air
pressure switch
1 - Replace fan
1 - Reset the boiler
PUMP PROTECTION
ACTIVATED?
INTERNAL
P.C.B. PROTECTION
ACTIVATED?
B
C
FC004Ac