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just going back to what nickso said. When doing nothing the lamp is flashing orange, with SL ON, and just orange with SL OFF. Once it does start the lamp colours are correct but it seems to cut out early. Yesterday it ran all day without a problem then cut out (didnt restart) at about 6pm...

Thanks Guys. I have taken the PCB out to take a look at it and it is a Siemens PCB in a plastic casing it has LMU30.211A159 written on it. It didn't look anything like I was expecting from seeing the pictures of the clunky things shown on the internet in forums and it certainly didn't look...

Pulling my hair out on this one. Symptoms are that the boiler does not always start and seems to cut out early. When not working, the lamp flashes orange which indicates heat demand but suggests to me that the boiler thinks that it has reached temperature. The pump and fan do not run...