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central heating guage on the boiler rises to 2.8bars when heating is on?

What is causing the guage on the combo boiler (Worcester) to rise to nearly 3 bars after a few minutes when I put the central heating on?
Ronald Ellams, October 2009
Probably the expansion vessel has little or no air in it....if you can drop the boiler pressure to zero and then put a car tyre pressure gauge onto the expansion vessel valve, you need 10 psi in there.... so out with the foot pump!

John, October 2009
link Click here to see other fixes for Worcester.