Comb boiler losing pressure - tried everything!
Hi,
This is a right head scratcher! Any ideas greatly appreciated. My central heating system is losing about half a bar of pressure a week. It's a tiny back to back house, 4 rads and a towel rail. Veissman wb1b 30kw. Plastic piping. So far I've:
1. Ripped up the floorboards and run a finger over every single joint in the system, all the radiator valves, and the rads.
2. Bagged the pressure relief outlet.
3. Put a bit of cardboard under the boiler.
4. Replaced the expansion vessel.
5. Replaced the AAV.
6. Replaced the hw heat exchanger (was blocked).
7. Bled all the radiators.
And I still can't find where it's leaking. Is there anything else to try? Is it time for the f4?
Cheers!
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