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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

home Fix label Heating label_important Home Heating Systems category Worcesterdone

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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home Fix label Heating label_important Home Heating Systems category Worcester

Worcester 350 keeps losing pressure?

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Worcester 350 keeps losing pressure?

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