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220683B
9.1 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,
short circuit and resistance to earth checks must be
repeated using a suitable multimeter.
Refer to neon indicators “An Aid to Fault Finding”
diagram 9.1, Boiler Fault Finding diagram 9.2, Pump
Overrun Fault Finding diagram 9.3, the Functional Flow
diagram 9.4 , and the Pictorial Wiring diagram 9.5.
9.2 Electrical Supply Failure
Failure of the electrical supply will cause the burner to
go out.
Operation will normally resume on restoration of the
electrical supply. If the burner does not relight after an
electrical supply failure the overheat device may need
resetting.
Remove the control cover, see diagram 6.6 and push the
rest button on the front of the control box, see
diagram 6.1.
If the cutoff operates at any other time press the rest
button and the burner should relight. If the fault persists
refer to fault finding chart.
9 F a u l t F i n d i n g
Diagram 9.1
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.
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?
System satisfactory
Is neon 3 lit?
Is main burner operating?
Multi-functional control/harness problem
- see detailed fault finding chart.
NEON
INDICATORS
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