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potterton powermax he - heating?

hi - when running hot water - for some reason even if the heating is turned off on the boiler the radiators will still get hot. does anyoen know what this problem could be
thanks
rob, September 2009
lime scale in the system,need descaling

joe, November 2009
passing diverter valve

Ian, October 2009
link Click here to see other fixes for Potterton Powermax HE.