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221966B
11.1 Electrical
Important. On completion of the Service/Fault Finding task
which has required the breaking and remaking of the electrical
connections, the earth continuity, polarity and short circuit and
resistance to earth checks must be repeated using a suitable
multimeter.
Refer to diagrams 11.1 to 11.5 for the relevant fault finding and
wiring information.
11.2 Electrical Supply Failure
Failure of the electrical supply will cause the burner to go out.
Operation will normally resume on the restoration of the electrical
supply. If the burner does not relight after and electrical failure
the overheat device may need resetting.
Remove the control cover, see diagram 8.6 and push the reset
button on the front of the control box, see diagram 8.1.
If the cutoff operates at any other time press the reset button and
the burner should relight. If the fault persists refer to the fault
finding chart.
Diagram11.1
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
Ignition, pilot or flame proving fault -
see detailed fault finding chart.
Air flow proving fault - that is fan or air pressure
switch - see detailed fault finding chart.
Multi-functional control/harness problem -
see detailed working?
fault finding chart.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Low water pressure (sealed system),
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?
System satisfactory
Is neon 3 lit?
Is main burner operating?
NEON
INDICATORS
4120
11 Fault Finding
