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I posted earlier regarding some problems with a Glow-Worm 40FF boiler on an open-vented system. We have no hot water cylinder, just the boiler, a Grundfos pump and a fill/expansion tank in the loft. Summary to date: Radiators were working for the most part, but the radiators upstairs had a...

Hello I seem to be having some trouble with my central heating system at the moment. As it's gotten colder, I noticed that the radiator in our upstairs loo was only getting warm at the bottom, while the other radiators seemed to be warm all over when the central heating was running. After...