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Glowworm combi boiler pressure rises when central heating on?

My Glowworm 30ci combi boiler has an operating pressure of 1.5 bar but when I switch on the central heating the pressure starts rising fast. Is this normal?
Holly, September 2007
no

hi-spec plumbing, September 2007
link Click here to see other fixes for Glowworm 30ci.