I have 1 radiator that wont and never has heated up. The system is balanced and all other rads work fine. the lockshield valve is fully open. the pin on the trv is not stuck but the rad and both pipes remain stone cold.
I recently, out of desperation, tried completely removing the bleed screw, while the heating was running. After a short while the radiator got nice and hot, as did both pipes. this led me to believe there were no blockages in either the supply or return pipe. As soon as the bleed screw was replaced the rad and pipes started cooling and are now stoneycold again.
anybody got any ideas??

cheers in advance

Rick, January 2009

thanks Roger, but sorry, forgot to include that in my question. Was the first thing I tried and didnt work.

cheers anyway

Rick, January 2009

If you turn off all the rad valves I expect the cold 1 will then get hot, then turn each rad valve 1 quarter of a turn to re-balance the system

Roger, January 2009