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creeps to 3bar?

Hello, creeps up to 3bar when heating off and on. But can go back to 1.5 bar. The boiler is working fine apart from this i am reluctant to get a new one if this problem can be fixed cheaply.
kevin eastwood, February 2008
Expansion vessel red/orange is deflated pump up with car foot pump to about 1.5 to 2 bar pressure when boiler off..

dpheating, February 2008