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Thanks, I totally understand the gas safe aspect as my background is large scale industrial gas. Really just after an idea of common faults. Long term I'm gonna replace with a combi if this is the best route?

Thanks for the reply, Would this be liked to the flow switch I guess?

Hi there, If anyone can help me or at least give me some pointers it would be great, as I am seriously stuck. I do have a technical back ground but my knowledge of central heating is very limited, prior to making a choice on attempting a repair or looking at going down the combi route as a...