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Just open the balance valve a bit and see what happens. Turn it back a bit if it's too much.
I think they can get blocked up if only cracked open during initial balancing. We've had a couple like that!
Dramatic_Hammer-
It turned out to be a load of air in what I didn't realise was the next radiator along.
There are three radiators in our loft extension, the one which wasn't working then two which badly needed bleeding.
Once I'd bled them and topped up a bit with the filling loop all good. Water very clean so I don't think it needs a power flush or anything, I didn't bleed
much water - just lots of air - so the inhibitor should only be slightly watered down.
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?