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Hi again, Thanks for that guys. I have opened the boiler-something I have not done before. I think the expansion vessel is too well hidden for me. However there is a valve with 3Bar written on it. I gave this one quick one second turn-it hissed-and the pressure has not risen above 2Bar since...

Cold this reads 1bar. In the last week when heating it reads dangerously close to 3 bar. Any ideas why? Regards. Ger