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worcester 24cd1?

the pressure in the boiler constanttly stays at 4bar, blowing the release valve. integral filler loop by key not connected, heating and hot water works fine,
dave thompson, November 2009
it sounds as if the plate heat exchanger is cross leaking and requires replacement. this means mains water is constantly filling your system.

joe, November 2009
link Click here to see other fixes for Worcester.