what part is needed? my 105e keeps riseing to its max presure i have to run it down 2x a day i know it is not passing through loop filler as it is disconected it also drips water from the air screw on the pump???

john mccann, November 2007

if it happens when your heating is on it may be that there is a problem with the diaphram in the expansion vessel ...if it happens when the heating isnt on it will most probably be the plate heat exchanger has a small hole allowing the cold water in to pass into the primary circuit and will need a new plate

brandon, December 2007

Is the pressure rising when the boiler is on or does it do this when its stone cold and hasnt been used?

Mr A, November 2007