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Cheers Chris. Yes, R1 is 100 ohms. The capacitor which it is snubbed with is a long orange thing (metallised polyester film capacitor I'm guessing?). The value on the top of it reads 680k 400'. I've tried getting hold of these via internet, etc.. and simply can't find them. Please let me...

No joy I'm afraid. The stem of the pipe appears dry as do the solenoid valves. Everything seems to be pointing back to a new Sequence Board. Even the fault finding guide suggests Seq Board ("Fan starts before Relay 1"). I'm hoping the 2nd hand one that I got was dodgy?? Other than that I'm...

Can anybody please help? I simply can't get the boiler to ignite. When I demand hot water the modulation board does it's job, but as soon as the sequence board kicks in things go horribly wrong! It seems that I am getting a spark at relays RLL and RLT but a puff of smoke from the R1 resistor...