We changed our boiler in this spring and checked all radiotors work with heating. Recently one of our room radiotor is not heating. I did bleed it but still have cold radiotor. I found the pipe in that room running to radiator also doesn't get hot too. But pipe other side of room is hot when turn on boiler. And that pipe looks like go through wall connected other pipe have no heat. Because it is running inside wall partially I can't see the clear picture. What should I do solve this issue?
