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my swiftflow combi100 water pressure keeps going up when the heating is on?

when my central heating comes on my water pressure gauge keeps going up until the prv comes in or i turn thr stat down and then the pressure drops on its own
paul, November 2011
Pressure vessel need pump to 1.5 bar when boiler is cool shut down with cycle pump press to take air out if water comes out than replace vessel

ltd, November 2011
link Click here to see other fixes for Swiftflow combi100.