41
Remove combustion
chamber cover.
Is the sense electrode
and lead in good
condition and is gap
correct?
Replace flame sensor
or wiring.
No
No
Remove multiway
connector from board
position
ST16
.
Is there continuity
from pin 7 (green wire)
to flame sensor?
Yes
Yes
Yes
Relace control board.
NOTE: It is not
possible to reliably
check the cross-light
performance of the
burner, or the
efficiency of the
gas/water heat
exchanger.
If there is still a
problem, investigate
flue problems or
replace burner or
injector or heat
exchanger.
Does the flashing fault
signal occur at the
start of a demand?
If flashing occurs at
the end of a demand.
Gas valve leak is
detected.
Replace gas valve.
No
Yes
If flashing occurs during a
demand.
Pump could be partially
blocked.
Clean pump & flush system.
Re-fix sensor to pipe.
No
Turn off boiler. Remove
inner casing cover and
inspect the primary
sensor (on heat
exchanger in front of
overheat thermostat).
Is it correctly fixed to
pipe?
Yes
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