Does appliance
perform a pre-
purge of fan &
pump ?
Does sparking
commence ?
Are any LED faults
indicated ?
Does boiler
go to lock out ?
Does the burner ignite & remain on ?
Does burner ignite ?
Does the boiler
attempt to light 3
times in 1 minute
intervals
Reset by turning to
standby for 15 secs
Go to Chart 2
Go to Chart 5
Replace PCB
S
T
A
R
T
Does the boiler
light ?
Yes
No
Yes
No
Yes
Yes
Go to
Chart 5
Is flame present
before lock out?
Check burner /
injectors gas
pressures & probe
Check gas valve /
gas supply and
pressu res
Check ignition and ionisation
probes for correct position &
damage
Go to
Chart 5
Go to
Chart 5
Replace PCB
Check related sensors & replace
Yes
No
No
No
Yes
Yes
Yes
No
No
No
No
Yes
Check wiring and
condition of HT leads?
Is the air pressure
switch activated ?
FAULT FINDING CHART 3
FAULT FINDING CHART 4
Does Fan operate ?
Check fan / tubes /
flue assembly and
case seals
S
T
A
R
T
No
No
Yes
Yes
Yes
Go to Chart 4
Replace Fan
Is 240 Vac present at
Fan ?
Check the air
pressure switch
operation
Replace PCB
Replace PCB
Yes
No
No
Yes
Yes
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