80
FLAME LOSS - 1 CHECK OTHER GAS APPLIANCES WORK -
2 CONTACT INSTALLER
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 52). 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)
Check spark generator and
associated harness for: continuity
and visual condition. (Refer to
Frame 53) Are these functioning
correctly?
Check ignition electrode and
associated harness for: continuity,
visual condition and position.
(Refer to Frame 51) Are these
functioning correctly?
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
NO
Check ue for obstruction
NO
Check wiring to thermostat
YES
Clear obstruction
YES
Ensure wiring correctly
connected
Check if burner is
damaged
Check ue temperature always
remains below 90ºC
NO
YES
Replace Thermostat
NO
Replace heat exchanger
YES
Replace burner
* 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.
NO
YES
YES
YES
207895-2.indd 60 02/01/2013 09:38:50
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