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 (PCB)
Is neon 1 lit? Fault with mains supply or PCB fuse.
Overheat cut off device tripped or
thermostat, overheat cut off device
faulty - see detailed fault finding chart.
Air flow proving fault -
that is fan or air pressure switch -
see detailed fault finding chart.
Ignition, pilot or flame proving fault -
see detailed fault finding chart.
Gas valve / harness problem - see
detailed working? fault finding chart.
Is neon 2 lit?
Is neon 3 lit?
Is neon 4 lit?
Is main burner operating?
System satisfactory
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
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