the pressure gauge shows the pressure in the heating side of the boiler and is nothing to do with either the cold water or hot water pressure, the filling loop is either open or is letting water past to get the pressure this high. you need to release some pressure from the heating via a drain off on the boiler or on a radiator, the pressure gauge when the heating is cold should be between 1 to 1.5 bar
Steve
July 2005
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