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Thank you for all the suggestions. I have done everything that was recommended, and my bolier is now fully functioning. Many thanks once again, JohnnyDee

Going to try this one. Thx

. The filling loop was faulty, got stack, I've replaced it.

I've tried that, still the same.

My Glow-worm boiler pressure keep fluctuating only when the central heating is on. Every time I refill it to 1 bar it goes from 1 bar to almost 4.0 bar. The when the central heating switches off, it goes to 0 bar after a while. There are no leaks. The radiators have just been bled. The...