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221834B
Diagram 13.1
Before detailed checking of electrical components ensure that remote controls are calling for
heat. Check that the gas supply is free of obstructions and purged of air. Check the overheat
thermostat and fluehood thermostat have not operated. Isolate the electrical supply and
physically check ALL cables, connections and the printed circuit board (PCB) fuse. Check
the air tubes to air pressure switch.
Is there 240V
between L + N
Isolate supply
Check continuity
of overheat
thermostat.
Thermostat ok ?
Is thermostat
neon on ?
Correct power
supply problem
Isolate supply
1
Is there
continuity
between
NC
and
C on APS
Replace APS
Check continuity of
control thermostat
between 3 and 6
ok ?
Replace control
thermostat
NO
YES
YES
Check wiring
and IC PCB
'stat' plug for
defects.
Repair or
replace wiring/
PCB if
necessary
YES
YES
NO
NO
NO
Replace
overheat
thermostat
NO
YES
PM5
13 Fault Finding