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I have a Worcester 240 boiler. The hot water works fine, but if I try to use the central heating, the heat does not leave the boiler (ie the output pipe stays cold), and the boiler overheats, tripping the overheat switch. When I run the hot water, I notice that there is no run on through the...

I have a problem with my Worcester Bosch 240 boiler. The hot water works just fine. However, if I make a demand for central heating, the boiler fires up, and within about 20 seconds, the boiler pressure gauge rises rapidly to about half way, before the boiler overheats, and the reset switch pops...