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my potterton puma 80 loses water pressure?

my boiler loses water pressure after i,ve put the heating on.i cant see any leaks in the hoose or from the boiler,exept a pipe outside the hse attached to the boiler is dripping.do you think this is the problem?,,and is it repairable?.
john richards, April 2007
IF you recharge to 1 bar then turn the heating on if the pressure rises very quick to 3 bars then the pressure vessel is faulty this can be either replaced on the boiler or a remote one fitted if the safty vale to outside was dripping then this should be replaced as well

RAY, April 2007
yes thats the prv, needs replacing.

hi-spec plumbing, April 2007
link Click here to see other fixes for Potterton.