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Worcester 350 keeps losing pressure?

My worcester 350 keeps losing pressure and then switching off. I have replaced the pressure release valve (twice now) and this has not stopped the problem. Is there anything else I can check before I have to get a plumber in?

Thanks

Neil
December 2009
WorcesterHeating, Home Heating SystemsWorcester Keeps Losing Pressure
check the pressure in the expansion vessel
should be about 1 bar with no pressure in the rads

b
December 2009
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