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By the way.....when I had the TRVs fitted, the guy came back and also fitted 2 x Bottle Air Vents in the airing cupboard above the pump. The system never had these before and wonder if they are necessary? Should I lock them off, or leave them open for air to escape?

Ok peeps. Sounds like the first thing to do is get the TRVs taken off the downstairs radiators, would you agree? Even though they are always on 'max'? :shock: And if this doesn't have a positive effect, get the system cleaned? :)

I don't think (though I ain't no expert obviously) that the room has reached desired temp. Opposite prob-rad1 (this is downstairs in open plan diner/living room) there is a master thermostat about 3 paces away. Walk to the other end into the living room area and a radiator there never goes...

It was to have the system on (after being cooled down) and only having 1 of the 2 problem rads TRV turned on. All other TRVs set to off. When this rad was hot, I adjusted the LSV so that the outlet pipe temp was a bit coller than the inlet. Once set, I let it run on its own for a bit and then...

OK guys. Had some TRVs fitted all around the house about 4 years ago. Since then, had a problem or two with 2 of the radiators in particular. I have looked up balancing techniques on this forum and applied them and is a whole lot better. Problem is, just when I think everything is OK, I...