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Just to follow this one up - the man from Worcester came round and replaced the diverter valve, PRV and AAV, external leak from boiler now fixed. Having turned off all the rad valves and isolated the CH from the boiler I have come to the conclusion that there is a leak in the CH pipework, more...

Can't see any pipes going outside for the PRV - I'm in a 2nd floor attic flat and the boiler's mounted on a shared wall (its a terraced house). The flue goes through the roof but don't think there's any copper pipes going out there... I guess the boiler leak needs fixing anyway, so I'll see...

The system loses pressure whatever happens. I haven't run the CH since the other night, and it still goes from 1 bar to empty in around an hour. Rad valves are all fine and dry. If AAV is automatic air valve, this is also fine - when the boiler is pressurised it vents as intended. I'm not sure...

Hi all, I have a problem with my 3 year old 24cdi which I think is diverter valve related. It has been dripping from the holes through which you can see the shiny steel shaft for a few years, not at a great rate so I put up with it. I have recently had my bathroom done, at which point a towel...