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Worcester Bosch 28i Pressure release?

My Worcester Bosch 28i junior works fine on central heating but if i run hot water at the same time as the c/h being in use, the boiler makes a pressure release noise immediatly after the tap is turned off. The pressure gauge however does not fluctuate. Please can you advise
Niggysol, December 2009
on all taps. pressure gauge does go balistic but then stabilises.

Niggysol, January 2010
water hammer, is this happening from just on tap or all taps?

mac, December 2009
link Click here to see other fixes for Worcester.