77
aLTERNa TINg ‘F’ aND ‘2’ - FLaME LOss
Does the boiler ignite for a short
time and then extinguish?
Check the detection electrode and
associated harness for: continuity,
visual condition and position (Refer to
Replace as necessary
NO
Check gas supply and
rectify fault
NO
Is 215Vdc supply available at the Gas
Check spark generator and associated
harness for: continuity and visual
functioning correctly?
NO
Check ignition electrode and associated harness
Check siphon and
condensate drain pipe
work for blockage and
now working OK?
Check wiring from gas
If the wiring is OK then
NO
NO
Replace Ignition
Electrode and
associated harness as
necessary
NO
Replace Gas Valve
* 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.
78
aLTERNa TINg ‘F’ aND ‘3’ - FaN FaULT
and has not deteriorated? Does the wiring have continuity?
Rectify Wiring &
connections
Is there 230Vac at Blue and Brown connections to the 3 way connection on the Fan?
NO
Replace Fan
79
aLTERNa TINg ‘F’ aND ‘4’ - FLOW ThERMIsTOR FaULT
Check the resistance using a suitable multimeter
At 25
o
o
o
C expect 1,000 - 1,100 Ohms
NO
Check and replace wiring as necessary
NO
NO
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