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Pressure keeps Droping?

How can I stop the water pressure from dropping in my Chaffateaux combi boiler and the water coming out of the overflow when it does this?
Andrew Smith, May 2009
the prv is letting by, it may need changing.
when the boiler is running does the pressure get hight

b, May 2009
link Click here to see other fixes for Chaffoteaux combi boiler.