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Glow Worm Swift Flow 1997 condensing boiler?

My Glow Worm Swift Flow condensing boiler when i turn the hot water tap on i get hot water but the pressure gage bounces up and down and makes a low
vibrating noise, please can anyone give me any advice on how to fix this?
Oz1, July 2009
The mini expansion vessel on the cold water inlet below the dhw flow switch will need to be re-pressurised.

Ian, July 2009