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not to worry, I wouldn't blame you!! I'll post up what the problem was once I've tried to replace the pcb - and it's hopefully sorted!! A plumber mate of mine phoned some kind of help line and held the phone to the boiler to give the operator an idea of the noise. His imediate reaction...

cheers Tony, I'll replace the pcb then! As it's a system boiler, not a combi, I don't get the same effect by turning the hot tap on a little as we've a hot water tank. Thanks for the info and advice

The hot water ignition seems fine - no noises. However when the CH fires up there's a really loud buzzing noise. This is short to begin with but as the boiler heats up it seems to go on for longer. It trips the system when it buzzes for more than about 15 seconds and I need to reset it every...