Radiator not turning off 

thank you very much i was crying that i couldnt place it back and im using my dads laptop and if i brke that i will be dead thank you very much

Hi there, Its clear in my video that if the pin on the trv has worn out, then your only option is to replace it. There isn't a way to replace the pin by itself if there was it would be a different video.

This doesn't address the valve not working it merely replaces it with one that does.