55
Response FF80
- Installation
85 Spark generation and ignition
NO
Notes.
a.
Do not attempt to measure the voltage between the spark generator output (spark) leads !
b.
When panels are removed for service, live parts are exposed so caution should be exercised when fault-finding.
Check connections on PCB 37.
If no fault found, check PCB 37 by
substitution
Is there mains voltage on PCB 37 terminals
for the spark generator
during ignition trial
period (i.e. when LED 2 goes OFF briefly) ?
YES
NO
NO
YES
Check leads to the spark generator
Rectify faulty connection
Is there mains voltage at the spark
generator during ignition trial period ?
Are the mains leads at the spark generator
correctly fitted to the tags ?
Is there evidence of the spark 'tracking'
(jumping across electrodes or leads)
externally to the burner ?
YES
YES
NO
Rectify poor connections or replace the
spark generator or electrodes
Remove the fan and burner assembly and
reconnect spark leads to the electrode
terminals.
Check that the gap between terminals is 3 to
5mm and that the distance to the flame strip
is 12mm (± 1mm).
With gas OFF, do another ignition cycle.
Is the spark OK now ?
YES
NO
YES
Return to main
menu
NO
Re-assemble and
restore gas supply.
Boiler should now
light and the
'Burner On' neon
illuminate
Fit a new
ignition
electrode
assembly
Replace faulty spark generator and
restore gas supply
FAULT FINDING
Fan and gas supply OK. Correct burner
pressure can be confirmed during ignition
attempts. Ignition spark suspect
F
AUL
T FINDING
Disconnect HT leads from the spark
electrodes.
Place the leads so that the connectors
are 3 to 5mm apart and clear of other
metalwork.
WARNING
Do NOT hold the leads
Turn off the boiler gas cock.
Is there a spark between the HT leads
during an ignition trial period ?
