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how can i stop my worcester 24i junior from constant pressure rising itself?

my boiler keeps pressurising it self how do i stop it
joe, July 2012
two things, its either the expanssion vessel needing recharged causing the pressure to rise when in use or the main heatexchanger has a hole in it allowing the water and heating sides to mix causing the pressure to rise.

Martin MRH Gas, July 2012
filling loop may be letting water so diaconnect it and cap it and than see

k, July 2012
link Click here to see other fixes for Worcester 24i.