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FAULT FINDING
IGNITION FUNCTIONAL CHECK 1
PILOT WILL NOT LIGHT
Ensure there is no debris around the pilot assembly, e.g coal, soot, etc which
could short the spark, clean the area. Check for fluff in the pilot aeration hole.
See Diagram 7, arrow A.
There is a blockage in the system, check the inlet test point, the mag
seating, valve and pilot filter.
Operate the valve.
Is there a spark?
Consult users book
and retry
Ensure gap between the
electrode & thermocouple is
as Dia. 7 & retry. If gap is OK
then first change the
ignition lead & retry, if still no
good then change gas valve
Is the control being operated
correctly?
Will the pilot light with a
match
Is the gas turned on to the
appliance?
Check isolation tap and
gas meter, retry
Purge the gas pipes
and retry
See “NO SPARK” chart*
System OK
Is the gas pressure
correct?
Has the system got any
air in it?
Does the pilot light?
Correct and retry
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
IGNITION FUNCTIONAL CHECK 2
NO SPARK
Ensure there is no debris around the pilot assembly, e.g coal, soot, etc which
could short the spark, clean the area.
Consult users
instructions, retry
Operate the valve.
Light the pilot, does the
valve click?
Is the gap between the
electrode & thermocouple as
in Dia. 7?
Is the control being operated
correctly?
Reset the pilot burner
Correct and retry
Has ignition lead become
detached or is connection
poor?
Replace the ODS unit
Replace the electrode lead
and retry
Replace the gas valve and retry
Check for defective or
damaged control knob
spindle or cam operation.
Check for correct location of
piezo components.
Correct and retry
Remove the electrode lead
from the piezo. Operate the
valve. Does a spark jump
from the piezo to the valve
body?
Remove the electrode lead
from electrode with insulated
pliers hold the tip 3.5mm
from the pilot pipework, is
there a spark when the valve
‘clicks’?
Is the electrode wire
detached from the piezo in
the valve?
Replace the gas valve, retry
YES
YES
NO
NO
*
NO
NO
YES
YES
YES