Having a bit of trouble identifying the cause of a cold radiator. Heating is an unvented system fed from a hot water tank. The two rads closest to the tank heat up very quickly, but then there are three more that heat up very slowly and a final rad that stays stone cold. I tried balancing the rads, no joy. Even closed all valves on the other rads and opened them on the cold rad, but still nothing. Have bled all of the radiators. One thing to note is that the feed to the rad at the trv end is piping hot, but the return end is stone cold. no heat in the rad anywhere. Any suggestions from anybody more knowledgeable than I?
Much appreciated,
J
Much appreciated,
J