74
ALTERNATING ‘F’ AND ‘2’ - 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 detection electrode and
associated harness for: continuity,
visual condition and position (Refer
to Frame 46). Check if condensate
pipe is blocked. Check if ue is
blocked.
Replace as necessary
NO
Check gas supply and
rectify fault
NO
YES
Is 215Vdc supply available at the
Gas Valve while the ame is on?
(* See note)
YES
Check spark generator and
associated harness for: continuity
and visual condition. (Refer to
Frame 47) Are these functioning
correctly?
Check ignition electrode and
associated harness for: continuity,
visual condition and position.
(Refer to Frame 45) Are these
functioning correctly?
YES
Check siphon and condensate drain pipe
work for blockage and rectify if necessary.
Boiler now working OK?
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
Replace Ignition Electrode and
associated harness as necessary
NO
Replace Gas Valve
NO
* Note: due to the wave form of the rectied voltage, the reading will vary depending on the type of meter used to measure the
value. In general terms a reading greater than 150V indicates that the correct voltage is supplied to the gas valve.
75
ALTERNATING ‘F’ AND ‘3’ - 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 230Vac at the Blue and Brown connections
to the 3 way connection on the Fan?
NO
Replace PCB
NO
YES
Replace Fan
YES
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