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Thanks Tony, you confirmed my observations about the PCB getting slowly cooked by the boiler! Your tip about using foil to reflect the heat back is an excellent one. I would also advise caution using aluminium foil close to exposed electronics, especially in a hot zone. The fixing method or glue...

Hi WWY, Your symptoms are identical to how mine went, right down to the repeat attempts & powering off. The original batch of capacitors I got from Maplin got things running again initially, but these turned out not to be so great after a few months when things started going the same way...

Yes you can. Open the control door and take out the screws. (don't forget the one in the middle! :) ) The outer cover for the whole of the control and electrical side of things on the right slides straight towards you. Take out the top screw and the PCB holder hinges out leaning forwards...

Fixed my boiler in a day with change from £3.50 for parts, yes, really, three pounds fifty! Potterton Suprima 50, nine years old, now working fine again with its original PCB. It starting locking out with the flashing red LED on rare occasions, then increasing in frequency to every couple of...