I had to rehang a radiator in the bathroom. When first switching heating on it gets warm, after 30mins or so it goes cold and reamains cold. No air in the radiator. So I assume it is not balanced. The radiator is tapped from the main heating supply pipe directly above the boiler so it is effectively the first radiator. The return line goes into the main return line and is last to feed back to boiler. I have tried lots of setting but Iam getting nowhere, any ideas out there, cheers. 
