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ferroli combi77ff losing water presure?

have changed ch presure safety relef valve but still no change i keep topping the system up the hot water runs fine and the central heating runs ok and if we keep the central heating on then the presure remains but once i turn the heating of for a while the presure drops can any one HELP A.S.A.P

Keith Hazelwood
December 2009
FerroliHeating, Home Heating SystemsChanged Ch Valve

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