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Sorry, I decided that if I started a new thread about this then an old forum hack would've had a go at me for not checking out old threads for answers before cluttering up the board with stuff that has already been covered. Plus, I thought the forum would work in a way that shoves the newest...

We've had someone in to check the problem out. Initially he thought it was the pcb but then noticed a faulty microswitch which wasn't turning itself off after we stopped using hot water. The switch is triggered by a pin which is pushed by a diaphragm (sorry, don't know much about...

We have the same boiler, with the same problem. Would've been good to have some more feedback from the original poster to see if any of the suggestions actually worked and, if not, then what the final solution was.