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Thanks for replies so far. Have turned all other rads off - no effect. Valves are not thermostaticaly control (assume that is what TRV means??) but are simple hand turned on/off. There is no pin to push down once head of valve removed. So would I be in assuming that it is either completely...

I have one cold radiator. It is not the furthest from the boiler. I have tried bleeding air out of it but as far as I can tell only water comes out. When I do this the 2 pipes leading to the radiator get hot but the warmth does not spread beyond the valves. When I stop bleeding, the pipes get...