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How do I stop my Glow-worm Combi-Boiler overflow from emptying the system?

There is something wrong with the overflow mechanism on my boiler. The central heating water pressure shows 0 psi, when I fill it up to the correct pressure the overflow runs until it is back to 0 psi.
David Cope, February 2008
either pressure releif valve or pressure vessel or both have gone vessel is about £80 prv about£15

pete, February 2008
link Click here to see other fixes for Glow-worm Combi-Boiler.