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presure goes up ?

presure goes up to3.5 bar and water drips out can you tell me the course of this. baxi combi 105 he
gaynor evans, November 2010
I had a similar thing happen on my boiler after a service,it was the feed pipe to the boiler the tap was slightly open causing the pressure to go up. not sure if this will help but worth looking at. MRW

MRW, November 2010
sounds like the expantion vessel

b, November 2010