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14.0 Fault Finding
Turn selector to
neon illuminated.
Turn Central Heating
thermostat to maximum.
neon illuminated.
Go to section ‘A’.
neon flashing
Go to section ‘B’.
External controls calling for
heat and where fitted, internal
clock calling for heat.
Ensure controls are set to
demand and verify the contacts
are closed.
NO
Central Heating - Follow operational sequence
Primary water is diverted from
preheating circuit to CH
system.
neon illuminated.
Primary flow switch operated.
Pump runs.
Fan runs at max speed.
Air pressure switch proved.
Spark at ignition electrodes for
up to 10 seconds.
neon illuminated.
Burner extinguishes after 10
seconds.
Preheating function starts after
25 seconds.
neon flashing
(see DHW preheating
function).
Primary water is diverted from
preheating circuit to CH
system.
neon illuminated.
Go to section ‘M’.
neon flashing
Go to section ‘B’.
neon flashing
Go to section ‘C’.
neons flashing
Go to section ‘D’.
Turn the selector to reset.
If regular resetting is required
or appliance still does not
operate investigation is
necessary.
Go to section ‘J’ & ‘O’.
NO
YES
neon flashing
Go to section ‘E’.
neon flashing.
Turn selector to the reset
position. If the neon does not
extinguish go to sections H and
K.
Change main PCB.
Go to section ‘F’.
neon flashing
Go to section ‘I’ & ‘N’.
Preheat control is not at
minimum position. External
control calling for heat.
Go to section ‘L’.
Go to section ‘M’.
YES
NO YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
NO
NO
NO
YES
YES
NO
YES
NO
NO
YES
NO
YES
neon flashing
NO
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