In message , BigWallop
writes

"Paul" wrote in message
...

"BigWallop" wrote in message
om...
If the boiler has an electronic ignition, then check all the electrical
connections inside the boiler control panel. Vibration from running
fans,
temperature changes Etc. can cause the connector to loosen off from
their
mounts. The cold boiler will spark, but if it's hot it wont, sort of
scenario.


thanks for the replies so far, the boiler has electronic ignition. i have
checked all the connections and they look ok, the only thing i have
noticed
is that one of the wires going to the electrodes has a sooty deposit on it
so there may be a short to the case, does the electronic ignition produce
high enough voltages to arc through poor insulation?. looking at the wire
the insulation looks ok


Yes. If the integrity of the insulation has been compromised, then the
spark will not reach the tip and will jump to the closest negative point
along its path.

The problem is that it is not flame sensing, not that it isn't sparking
at the electrode

You could maybe paint a Bic pen black with white ends and chant the
magic words "izzy wizzy , lets get busy" while waving it furiously
around, but other than that I really don't think it's going to help

--
geoff