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4.6
FLAME LOSS
Does the boiler ignite for a short
time and then extinguish?
YES
Check the electrode and associated
harness for: continuity, visual
condition and position
Refer to Section
3.9
Check if condensate pipe is
blocked. Check if flue is blocked.
Replace as necessary
4.7
FAN FAULT
Does the wiring from the Fan to the PCB have
secure connections at both ends and has not
deteriorated? Does the wiring have continuity?
Is there 230Vac at the Blue and Brown connections
to the 3 way connection on the Fan?
Installation and Servicing
Section 4 - Fault Finding
NO
Is the Gas Pressure available at
the Boiler Inlet (>18 mbar)?
Is 24V DC supply available at the
Gas Valve while the flame is on?
Check spark generator and
associated harness for: continuity
and visual condition.
Refer to Section
3.14
Are these functioning correctly?
Check electrode and associated
harness for: continuity, visual condition
and position.
Refer to Section
3.9
Are these functioning correctly?
Check trap and condensate drain
pipe work for blockage and rectify
if necessary. Boiler now working
OK?
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
Rectify Wiring &
connections
NO
Replace PCB
YES
Replace Fan
Check gas supply and
rectify fault
Check wiring from
gas valve to PCB for
continuity. If the wiring
is OK then replace the
PCB
Replace Spark
Generator and Harness
as necessary.
Replace Electrode and
associated harness as
necessary
Replace Gas Valve
continued.......
51
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