Supplied By www.heating spares.co Tel. 0161 620 6677
26
221504A
Neon Indicators - An Aid to Fault Finding
THE NEON INDICATORS ARE AN AID TO FAULT FINDING ONLY. FAILURE OF ANY OF THE NEON INDICATORS DOES NOT
WARRANT THE REPLACEMENT OF AN OTHERWISE SATISFACTORY PRINTED CIRCUIT BOARD (P.C.B).
Is neon 1 lit?
Fault with mains supply or PCB fuse
Ignition, pilot or flame proving fault -
see detailed fault finding chart.
Gas valve/harness problem - see
detailed fault finding chart.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Overheat cut off device tripped or
thermostat, overheat cut off device
faulty- see detailed fault finding chart.
Is neon 2 lit?
Is neon 4 lit?
Is neon 3 lit?
Air flow proving fault - that is fan or air
pressure switch - see detailed fault
finding chart.
Is main burner
operating?
System satisfactory
Diagram 13.1NEON INDICATORS
13 Fault Finding
NEON
INDICATORS
3324
12 Servicing
12.2 Burner and Injector Cleaning
With the main burner removed, brush off any deposits from the
burner, ensuring that the flame ports are unobstructed.
Do not use a brush with metallic bristles.
Check the main burner injector, see diagram 12.2, for blockage
or damage and remove if necessary.
Note: make sure that, if removed, the injector is replaced using
an approved sealant.
Do not clean the hole in the injector with a wire or a sharp
instrument.
Make sure that the main burner is pushed fully home on to the
injector.
12.3 Pilot Burner/Electrode and Pilot Injector
Clean the pilot burner and electrode.
When removing and replacing the pilot injector from the pilot
burner take care not to damage the electrode, see diagram
12.3, clean the injector by blowing through it.
Check that the spark gap is as shown in diagram 10.3.
12.4 Operational Checks
After completing a service, before fitting the casing, check the
inner casing seal to ensure that it is in good condition, renew if
necessary.
Light the boiler and carryout the functional checks as described
in Section 9 and 10.
Diagram 12.3
PILOT BURNER/
ELECTRODE and
PILOT INJECTOR
PILOT BURNER
ELECTRODE
PILOT INJECTOR
3323
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