my 105e keeps takeing in water and presure is building up to limit?

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