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Thanks, I've ordered a new pcb

I haven't taken the board out at the moment (because the boiler is still working fine), If it sounds like the board I'll just order a new one and hopefully fit it before the old one gives up completly.

It's one of the relay's on the circuit board which is buzzing.

Hi, we have gloworm ultimate 50ff, generally it's been reliable and in the last 12 years I have only had to change the fan once, It has now developed another fault though, it works fine but there is a continous buzzing noise due to one of the relay's on the circuit board continously vibrating at...