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I have a worcester combi 24cdi which is not holding its pressure?

My Worcester combi 24cdi will not hold its presure. The drop from around 1 bar to nothing happens in a few hours. I have been under the floor to look for leaks but cant see any or wet on the solum. Could it be something on the boiler.
Bryan Auchterlonie, December 2006
I have the same problem with 2 combi boilers both not holding the pressure and cannot find any leaks etc how do I check the pressure release valve

PETER@norman76.fsnet.co.uk, December 2006
Check the prv pipe outside. may not be the pressure vessel may just be the prv full of muck.

mark, December 2006
expanssion vessel faulty

hi-spec plumbing, December 2006
link Click here to see other fixes for Worcester.