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Yes flow, that’s what I meant. Water replenishment seems ok, plenty in the tanks. It’s very odd. I guess I’ll call them back out. Thanks for the tips anyway

I have a large main one, then a smaller one next to it so that makes sense then. I’d like to blame the engineer but as I said, it doesn’t do it on CH, just HW. The banging sounds like a pressured air lock if that makes sense. It has one of those valve motors that adds water to CH/HW as it deems...

Hi all, this boiler has many threads but I cannot seem to find one that matches my issue. CH works fine, this only happens when the HW is on. After about a minute it shuts off, then I get a continued banging noise. I did fit a radiator a while ago due to a leak, then British Gas fitted a burner...