K
Kev2022
My Worcester boiler is losing pressure. It only happens after the boiler has been on and it loses approx 0.5 bar each time. The expansion vessel was replaced last year and no improvement, I have checked the rads, no issues, also no obvious water patches on walls ceilings etc. I have also used some fennox leak sealer and no joy there... I'm at a loss really. I don't understand how if its a pipe issue the leak isn't continuous, it's literally only after the system has been run for a while and once it's off you see its dropped pressure from its last starting point. I thought the issue was resolved in the summer as we had no heating on for months and the pressure was sustained, also it doesn't seem to impact when I run a hot tap. Hopefully one of you experts can advise on a cause and hopefully a solution. Thanks for reading 
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