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Cheers for that; sounds straightforward if thats the case. Engineer is back tomorrow with thoughts of replacing he PCB board?! Sounds expensive!

It's coming back to me now.....the engineer replaced the high and low temp. sensors (?) as it seemed to run fine set on its lowest setting. On our normal setting (3) it just conks out. The lock-out light doesn't come on, just doesn't fire up. I have to manually override and switch off then...

I wondered if someone could help me please; my Biasi combi boiler (M90F 28S), is not firing up properly. It will work ok for a while then suddenly stop leaving noises like its trying something but there are no flames. This can happen on its own during a normal heatig cycle or sometimes when a...