4.6 FLAME LOSS
Does the boiler ignite for a short
time and then extinguish?
YES
Is the Gas Pressure available at
the Boiler Inlet (>18 mbar)?
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
NO
Check gas supply and
rectify fault
NO
YES
Is 24V DC supply available at the
Gas Valve while the flame is on?
YES
Check spark generator and associated
harness for: continuity and visual
condition.
Are these functioning correctly?
Check wiring from
gas valve to PCB for
continuity. If the wiring
is OK then replace the
PCB
NO
Replace Spark
Generator and Harness
as necessary.
NO
YES
Check electrode and associated harness
for: continuity, visual condition and
position
Are these functioning correctly?
YES
Check trap and condensate drain
pipe work for blockage and rectify
if necessary. Boiler now working
OK?
Replace Ignition
Electrode and
associated harness as
necessary
NO
Replace Gas Valve
NO
Refer to Section
3.9
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?
YES
Rectify Wiring & connections
Is there 230 VAC at the Blue and Brown connections
to the 3 way connection on the Fan?
NO
Replace PCB
Replace Fan
NO
YES
Refer to Section
3.15
58
Installation and Servicing
Section 4 - Fault Finding
FAUL
T FINDING
