45
Minimiser - Installation
83
FAULT FINDING TABLE 3 - Spark Generation and Ignition
Disconnect HT leads from the spark electrodes.
Place the leads so that the connectors are
3-5mm apart and clear of other metalwork.
TURN OFF BOILER GAS COCK
Is there a spark between HT leads during an
ignition trial period ?
Check leads to the spark generator
YES
Check connections on Board 37. If no fault
found check Board 37 by substitution
YES
NO
NO
NO
Is there mains voltage at the spark generator
during ignition trial period ?
Are the leads at the spark generator correctly
fitted to the tags ?
Rectify faulty connection
Is there evidence of the spark 'tracking' (jumping
across electrodes) externally to the burner ?
YES
Rectify poor connections or replace spark
generator or electrodes
Replace faulty spark generator
YES
Remove fan and burner assy.
Is there a significant amount of water in the
combustion chamber ?
Check condensate discharge system for
blockage, air lock or freezing
YES
NO
Fit new ignition electrode assembly
Is there mains voltage on Board 37
terminals for the spark generator during
ignition trial period
(i.e. when LED 2 goes OFF briefly)?
Connect spark leads to the electrode
terminals.
Check that the gap between terminals is
3-5mm and that the distance to the flame strip
is 12mm (± 1mm).
With gas OFF do another ignition cycle.
Is the spark OK now ?
NO
NO
YES
NO
YES
Fan and gas supply OK.
Ignition spark suspect
Re-assemble and restore gas supply. Boiler
should now light and 'Burner on' neon illuminate
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FAULT FINDING
FAULT FINDING
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