What can be causing this :?: The upstairs rads get hot as if I have the heating set on. The downstairs rads stay off and their control valve are open. The only way I can keep the upstairs rads off/cold is by closing their control valves. This is a chore every day and if I don't it's extremely wasteful! :(
Is there some master leaking valve from the boiler which is stuck open?
Any help would be appreciated. I know a little about the system (have replaced circulating pump and programmer in the past) but this one is unknown to me. Is it something I can fix?
Thanks guys. :)