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pressure rising very quick when c/h on?

i have a worcester 24cdi when i put the central heating on, the pressure rises very quick, i can actully see the dial rising as i look at it, rads get hot very quick, have checked the pump, which is turning, any ideas, keith
keith, November 2009
expansion vessel is flat - need to drain boiler & pump up vessel to 0.7 bar - refill system & run

dross, November 2009
link Click here to see other fixes for Worcester.