84
FLAME LOss
85
ThERMAL FUsE LOCKOUT
If the boiler is Reset, does the boiler Ignite for a
short time and then Extinguish
Is the Gas Pressure available at the boiler > 18 mbar?
Is 215Vdc available at the Gas Valve during
ignition? (* See note)
Check Spark Generator and associated Harness
for continuity, visual condition and position (refer to
Frame 60). Are these functioning correctly?
Check Ignition Electrode and associated Harness
for continuity, visual condition and position (refer to
Frame 58). Are these functioning correctly?
Check Syphon and condensate drain pipework
for blockage and rectify if necessary. Boiler now
working OK?
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Check the Detection Electrode and associated Harness
for continuity, visual condition and position. Check if the
Condensate Pipe is blocked. Check if the Flue is blocked.
Replace as necessary
Check Gas Supply and rectify fault
Check wiring from Gas Valve to PCB and replace if
necessary, otherwise replace the main PCB
Replace Spark Generator and Harness
as necessary
Replace Ignition Electrode and
associated Harness as necessary
Replace Gas Valve
* Note: due to the wave form of the rectied voltage, the reading will vary depending on the type of meter used to measure
the value. In general terms a reading of greater than 150V indicates that the correct voltage is supplied to the gas
valve
Isolate the electrical supply to the boiler and system
Ensure that the electrical connection to the thermal
fuse is pushed fully home and that the 6 way connector
is properly connected to the primary PCB.
Press r, is the fault still present?
Disconnect the 6 way connector to the thermal fuse.
Is there continuity across the black and yellow wires
in pins 1 and 2?
Disconnect the electrical connection to the thermal
fuse. Is there continuity across the fuse?
Replace the heat exchanger
Yes
Yes
Yes
No
No
Replace the primary PCB
Replace the wiring from the PCB to the
thermal fuse
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