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how can I fix my worcester 350 combi boiler?

my 350 worcester combi boiler works ok untill I turn the heating off then after a short time it looses pressure and I have to top it up to get hot water it happens every time I turn the heating off, I have put a new pressure relief valve on but this has not cured my problem.
john durham, January 2009
this could be caused by the pressure vessle not being charged with air and all you need to do to solve this is find the valve, attach a pump and bring the air pressure in the vessle to around 2 bar

mike, January 2009
the water must be going somewhere is it still coming out of the prv ?

tim, January 2009
link Click here to see other fixes for Worcester.