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High pressure in my ferrolli boiler?

My boiler was reading 3bar.I had the expanssion vessel replaced but the pressure is still rising.Any further ideas please
Darren, January 2008
the vessel has been replaced and the filling loop disconnected and the pressure is still high.does this mean that i will have to get the heat exchanger replaced?

darren, February 2008
3 reasons for pressure rising, expansion vessel, plate heat exchanger passing mains water or filling loop by passing.

Justin, January 2008
link Click here to see other fixes for Ferroli DOMINA 90.