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how can I fix my biasi 24s boiler ?

My boiler continues to lose pressure the overflow continues to leak until the pressure is 0 then the system stops
margaret anderson, April 2009
It looks like the P R V (press release vaule ) has worn, This need to be replaced with new,Not a big job would say £90 to £120 capitalboilers.co.uk

capitalboilers.co.uk, April 2009