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I have a Glow-Worm 30cxi?

the system pressure drops but the internal valve to re-pressurize doesn't seem to work, presumably a new valve?
Colin Smith, February 2008
really dodgy design of the fill valve( typical gloworm)
you need a replacement fill valve as you will find it has sheared off internally also a handfull of o rings because if you change a component on this boiler it will leak from another!

jeff( advantage plumbing and heating), March 2008
link Click here to see other fixes for Glow-Worm.