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Sorry just realised you knew that. No I haven't. I assumed as it sparked the lead is good - although I realise the spark is high voltage and the signal is very low voltage. Is this the likely cause?

On this particular model the ignition detection and Spark are done by the same lead. 4565TF honeywell control board.

Pilot assembley changed. No difference.

I got an rgi out for the initial problem, when it was not even attempting to light (just pump running). He told me the issue was the ignition board and the air pressure switch. He quoted £250 for the parts plus fitting. It was the CH thermistor and cost £6.50 from ebay. When I said haven't...

I recently fixed my friends Ravenheat CSI 85 boiler by replacing the CH thermistor. It was fine for a fortnight then it developed a new fault. I think the issue is with the gas valve - but this is an expensive part and I would like some opinions before I buying it. Call for central heating...