On 30/09/2020 13:41, The Nomad wrote:
All assembled knowledgeable folk,

I fear the time has come, the ravenheat boiler has expired, no spark, fan
runs etc. etc. but not spark, not even the clicking from the igniter ...

It might be the step up spark transformer that has failed rather than
the main PCB. Check to see if the primary coil has gone open circuit. I
probably wouldn't do an expensive control board swap if the thing is
already on its last legs for mechanical or corrosion reasons.

Disturbing things to make repairs tends to cause anything else that is
about to go wrong to wait about a fortnight and then fail.
OTOH you could be lucky and get another 5 years out of it.

--
Regards,
Martin Brown