Fault Finding - IDEAL icos system HE15 Installation And Servicing

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79 L.....F.... (FLAME DETECTION ERROR)
If the boiler reset button is
pressed does the boiler ignite for
a short time then extinguish?
YES
Check the detection electrode and
associated harness for:
continuity, visual condition, position
(Refer to Frame 62).
Replace as necessary.
Replace ignition electrode and associated
Note. Due to the wave form of the rectified voltage, the reading will vary depending on the type of meter used to
measure the value (some may measure the possible peak voltage of 339V). In general terms a reading
greater than 150V indicate that the correct voltage is supplied to the gas valve. As an alternative to a
multimeter, a mains voltage checking device may be used. E.g. an electrical screwdriver or a mains tester.
54

FAULT FINDING

NO
Is gas pressure available at
the boiler inlet ?
Is 200 V DC supply
available at the gas valve ?
Check spark generator and associated
harness for continuity and visual condition.
(Refer to Frame 63).
Are these functioning correctly ?
Check the ignition electrode and associated harness
for: continuity, visual condition, position
(Refer to Frame 61).
Are these functioning correctly ?
NO
harness as necessary
YES
(see note).
YES
NO
YES
YES
Replace gas valve
icos system -
NO
Check gas supply
and rectify fault
NO
Check gas valve
wiring for
continuity
Replace PCB
Replace spark
generator
Check syphon
and condensate
drain pipework
for blockage
Installation and Servicing