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Hi Thanks for your replies. Update from 7th October. Lowered water in expansion/header tank, and has only risen a little, keeping my eye on the tank. The CH is not on, ie the CH valve not open. The water is only going through the boiler, pump, hot water valve, coil and back to boiler. Would...

Hi I have hot water coming into my CH expansion/header tank via the cold make pipe and it overflows. Not had CH on, it only does it when hot water is on ie. boiler on, pump on hot water valve open. I have tried 1. Drain expansion/header tank, boiler off, pump off, valve shut, did not fill...