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Thanks Guys, I will check these out. Kev

Hi James, Thanks for responding. It is a mark II combi. Regards, Kev

I had a qualified Corgi reg. plumber install me a Worcester Bosch Combi CDi35 boiler abour 8 years ago. It has recently developed a fault where the hot water goes cold mid-stream when running any tap/outlet. Sometimes it reverts back to hot but after a number of minutes, and sometimes I need to...