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the pressure only rises when the hot water tap is turned on. if the pressure goes too high the prv releases it. alternativly the pressure can be reduced by draining water from the radiators!

i have a worcester 28 cdi.when the hot water tap is turned on the the pressure on the "sealed system pressure gauge" goes up to between 3-4 bar and the flame goes out. if the hot tap is left running the "sealed system pressure" goes back down to about 1 bar and the boiler flame returns. this...