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FAULT FINDING
34
START
Change
microswitch
Does the
pilot ignite ?
Are the
mains switched
on ?
Is
spark
generator
firing ?
YES
NO
NO
NO
YES
NO
YES
YES
NO
Clean pilot burner
Change pilot filter
Rectify flue
YES
NO
NO
NO
YES
YES
Change spark
generator
Check main fuse
& wiring
Connect lead
Switch mains on
Check electrode
lead & insulation
Is
there a
spark at the
electrode ?
Reading
230V
across
microswitch ?
Consult Gas
Supplier
Turn on gas
supply
Is
gas supply
turned on ?
Is
supply
pressure correct ?
(20mb working)
NO
YES
NO
YES
YES
NO
Has
new pilot filter
been fitted ?
YES
NO
Adjust spark gap
NO
YES
Is
pilot burner
clean ?
Change pilot
assembly
NO
YES
Is
spark gap
2.5 to 4mm ?
The thermocouple cannot be changed
as an individual component.The
complete assembly must be replaced
in the event of one or other
component failure(s).
Only use a Genuine Baxi Spare Part.
Reading
230V
at flying lead ?
Is the
lead from the
mains
connected ?
Is
poor flue
pull, downdraught
or blockage evident, or
flue otherwise
unsound?
Spark Gap
2.5 - 4mm