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heatslave gaining pressure?

i have worcester heatslave oil boiler.the pressure keeps increasing to over 3 bar.i relieve the pressure but almost straight away it rises again.can anyone help?
ethkate, October 2009
The PRV should be lifting at 3 bar?

John, October 2009
check the filling loop isn't turned on or passing, otherwise bust plate heat exchanger.

Ian, October 2009
link Click here to see other fixes for Worcester Heatslave.