We have one radiator in our house that heats up nicely, but after a while , it shuts off and cools. It does have a TRV fitted, which would explain it shutting off, but when the room cools, it doesnt seem to come back on. Is the TRV just very sensitive and needs the room to cool more before coming back on or does this sound wrong?
Trv is probably sticking try turn to max allow about an hour with heating on and then turn to min rad should cool then turn up again. Also try turning other radiators down this rad may not be getting its share of hot water system may need balancing.