Glow worm Betacom 24

[chelsea]

Been to this boiler as it had a leak on the prv.

been back again as its still dropping pressure,prv is tight, no leaks in the house,i have checked everywhere and its baffled me as to where it can be, i checked the main exchanger, nice and dry.

i disconnected the filling loop to make sure it wasn't coming from there and that to is dry and left it for a few days and that's all clear.

Could it be the diverter or secondary plate exchanger from inside?

Any help or ideas on where to look would be a great help.

 

[jonnyswamp]

Isolate the boiler overnight and then check the pressure when you turn the iso's back on in the morning, should point you in the right direction as to whether it's the boiler or system

 

[Last Plumber]

As above
If it was the plate the system pressure would equalise with the mains (prv obviously at 3 bar would open if the main was above that )

 

[kb76]

Yep as above or Expansion vessel...assuming boiler is in use?

 

[chelsea]

OK the boiler has been turned off for a few days with the flow and return valves shut off, he came back today and pressure has dropped to zero, no water from the prv, is it pointing to expansion vessel?

i can't think of anywhere else it could go

 

[kb76]

Or heat exchanger gone, any water passing through condense?

 

[jonnyswamp]

Likely main heat ex kuffed and system water entering combustion chamber (through split in wall) then running out the condense
EDIT as said above :wheelchair: