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must be 10 years since I changed it

Potterton ... ha ha think you need to jog on

so you want to replace a decent boiler with white goods? you will be lucky if your new boiler lasts 5-10 years, factor that into your efficiency calculations

Is there a perm. live feed to the switched live? have the relay contacts in the timer / stat welded themselves in the normally open position?

I've never seen domestic boiler pcbs like that before The components and interface are not right, Look like part of an analogue monitoring or control system Dispose of them corrctly under the WEEE regs

Potterton ? Don't quit the day job, the comedy circuit is not for you

It's capacitors on the pcb PLug and play replacement repaired one costs £50 ++ IIRC

This comes down to manufacturer design defect, it should fail safe, and ionisation flame sensing goes a long way in this being the case, HOWEVER, as bkue van man says in the next thread - -Profiles have a failure mode which brings on both gas valves without the spark