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worcester 28i II has high pressure?

Keep having problems with the high pressure,set boiler to 1.5 bar.Run the boiler the pressure goes up to 2 bar.boiler switches off pressure doesn't come back down.
Steve D., March 2006
it could be expansion vesel

bob, April 2006
could be a split in the water to water heat exchanger causing mains water to get in the heating side of things

darren, March 2006
link Click here to see other fixes for Worcester 28i II.