Thanks Old&Bold, I will give it a try, alas I will need to remove the cupboards that are in front of it first!
If one of the other valves is letting by, is it a case of replacing?
Hi Old & Bold,
The radiators in the conservatory have been removed and decommissioned about 4 years ago.
Can you clarify what you mean by "a zone valve letting by" please
I have an old Baxi Solo boiler, which has been converted to a pressurised CH system but gravity HW with a standard storage tank. There appears to be 3 2 port valves as the conservatory used to have a separate central heating system (I think), see picture attached.
We also have a solar panels...