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Worcester 35cdi Combi boiler pressure going up from 1.5bar to 2.5bar?

The pressure keeps going up by 0.5 to 0.75bar everyday. How can I fix this problem?
ppl234, July 2011
If it's happening with the heating running then the expasnsion vessel needs re-pressurised.
If it's happening with the heating off then either the filling loop is passing or the plate heat exchanger is burst.

Ian, July 2011
link Click here to see other fixes for Worcester 35cdi.