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Thanks for that. I did the no-no and flushed the pressure relief valve (being fairly sure that the system was clean, due to it having been fully flushed about a month ago). I just gave it a quick blast through a couple of times and it now seems to be ok. Time will tell Thanks again

We have a worcester combi boiler which is losing pressure ( around 1/2 bar every 12 hours) I\\\'ve traced all the joints and can find no evidence of a leak. However the overflow is dripping constantly. Is this likely to be the problem and if so how do I fix it? Thanks in advance