Plumbing

Worcester boiler high pressure and overflow pouring out

Anonymous user 15/03/2024 - 2.55 PM

Hi, We have a Worcester combo boiler, about 6 years old. About 5 or 6 days ago the pressure went up to about 2.5 (3 when heating on) and water is pouring out of the overflow outside. We have someone out who hasn’t been able to fix it. He replaced an internal washer as a leak had developed internally somewhere, apparently he pumped up the expansion vessel but that hasn’t worked. If I drain the system by bleeding a rad, it goes straight back up to 3, even though the top up valve underneath the boiler is now disconnected. The guy who came to see it was on about fitting an external pressure relief valve (Worcester’s are difficult to take off apparently?) but I am struggling to see how it is this? Am I right in that a faulty exchanger is the only other way water could be getting into the system? I.e. if I turn the mains water off by our main stopcock, it doesn’t go back up.... Please help. Also, how long will it cope being run at high pressure? Given we ain lockdown? Could you please advise on the ramifications if left like this? As we are now in lockdown I don’t think they will come back out.