when i top up my ideal 280 combi to 1.5 bar water is passed outside via safety relief valve.the pressure go,s down to 0.2bar water outside stops.this valve is new and old one done the same.this boiler has never liked good pressure.expansion vessel is good.hot water ok heating ok could pressure gauge be faulty

steve, February 2010

what do you mean the expansion vessel is good in what way how did you test it ?

wirecutterman, February 2010