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why have i got high water pressure showing on gauge?

I have a Vaillant turbomax vuw242e
Can anyone tell me why the pressure gauge rises up to 4 bar whenever the hot water or heating system is used
Ron, September 2008
I have the same problem on a Vaillant. I reckon the expansion matrix is blocked. Did you get yours fixed?

Nick, November 2008
link Click here to see other fixes for Vaillant.