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Thanks for the help guys. I'll get an engineer round before going any further. Your description of the board is exactly as mine. It's encased in a grey box but came out easy enough.

What is the latest board with the improvements then? Is the Siemens not it? Just to update. I took the PCB out today and re flowed/resoldered everything I could get to to with no avail. The issue persists.

Hi all I have a Potterton Suprima 30 boiler that has stopped working over the last couple of days. The issue is intermittent and sometimes it functions correctly. Some times, when heat/hot water is demanded, the boiler fails to start. When this happens, the fan does not start and I can...