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Is it blocked?
I've no idea of the hassle this would entail but can you remove it and flush it out with a high pressure hose?Or buy a new one.
bq-
Yep, sounds like it’s full of sludge. You can get a powerflush done on the whole system relatively cheaply.
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Is it blocked?
Hmm, quite possibly yes from my googling. I don't think an unbalanced radiator would be as cold as this one is.
Thanks both, I need to get my friendly plumber/heating engineer in anyway...
ectoplasmosis
Fox
All of our radiators are good, apart from the one in my study, which only heats up around the TRV although there's obviously hot water getting to it.
I've bled it, it's not the TRV and the radiators either side get super hot. The pin for the TRV seems to move up and down fine and not be stuck.
So rebalancing is the only thing I can think of, but it sounds like a right faff to be honest.
Any other ideas?