Fault Finding - IDEAL isar HE24 Installation And Servicing

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85 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 64).
Replace as necessary.
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 indicates that the correct voltage is supplied to the gas valve. As an alternative to a meter, a mains
voltage checking device may be used. E.g. an electrical screwdriver or mains tester.
86 L.....E.....
Internal fault within the PCB
isar -
Installation and Servicing

FAULT FINDING

NO
Check spark generator and associated
harness for continuity and visual condition.
Are these functioning correctly ?
Check the ignition electrode and associated harness
for:
Replace ignition electrode and associated
harness as necessary
or H.....E..... (PCB ERROR)
Is gas pressure available at
the boiler inlet ?
YES
Is 200V DC supply available
at the gas valve ?
(see Note)
YES
(Refer to Frame 65).
YES
continuity, visual condition, position
(Refer to Frame 63).
Are these functioning correctly ?
NO
Press and hold reset button for 2
seconds. Does boiler operate
correctly?
NO
Turn boiler off and wait for 5
seconds. Turn boiler on.
Does boiler operate correctly?
NO
Replace PCB
NO
Check gas supply
and rectify fault
NO
Check gas valve
wiring for
continuity
Replace PCB
NO
Replace spark
generator
Check syphon
and condensate
drain pipework
YES
for blockage
Replace gas valve
YES
OK
YES
OK
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