how can i stop the water pressure rising on my ravenheat white star boiler?

ours was doing the same.Firstly i made sure the valve to fill it wasnt leaking, or partially still open.With ours it wasnt.Never the less it still released water from the boiler through the pressure valve outside once higher than 3bar but then when it cooled down there wasnt enough pressure for it to re-fire up. bought an 18 ltr external expansion vessel from screwfix for £25.99. Fitted that & now she runs at a constant 1.5 bar

Brian
January 2011

mine is doing the same

matthew
January 2011

Check the filling loop is not open.

Carefree
December 2010