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Hi, I'm having some problems with the Glow worm boiler. I keep having to top up pressure and then it works. However, this morning the heating was coming on but there is no hot water even though when I run the taps it sounds like the water is boiling in the system. Any advice please?

Hi, I've got a problem with our Glow Worm boiler ultracom 24cxi. It lost all pressure and it was reading 0.0 but I managed to top up the pressure to around 1.5. However, I'm getting central heating but there isn't any hot water. What do you think the problem is?