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How can l resolve problem?

WORCESTER HEATSLAVE 20/25 0IL COMBI

Water pressure drops and will not rise, pump starts to make noise. To keep boiler working need to top up with cold water feed. I have installed new expansion tank, but makes no difference. Any ideas?
Kev Ebbins, October 2010
Either the prv is passing or you have a major system leak.

Carefree, October 2010
link Click here to see other fixes for Worcester.