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my boiler is still over pressureing checked expansion vessel and it is still at 1 bar. When c/h is running pressure gauge reads 3.5 + and vents any ideas

hi not used this site before hoping someone out there can help ,my boiler that has just come out of warranty, don't you just love them ,goes over system pressure after running for about 20 mins and dumps its guts out of the safety valve .It does not stop running but makes loud gurgling noise's...