Why do I have ONE radiator not working? Pease help.

[DaveC14]

Hi
I'm an amateur DIYer so please bear with me if I don't use the correct terminology. I have one radiator which will not get hot despite all the rest being on in the house. Here's what I have done so far:

1. I have bled the radiator.
2. I have turned the valve with the knob on it to fully open (is this the inlet?) and outlet valve to fully open. It does not have a TRV.
3. To check the inflow valve I turned it to open, closed the outflow, then undid the small nut at the end of the outflow valve and emptied the contents of the radiator into a bowl using the drain off. As I did this the radiator got hot all the way up to the top. I then tightened the small nut back up and turned the outlet valve to fully open. I went to bed thinking I'd solved the problem but when I got up in the morning it was cold again despite the rest being hot.

What might the problem be? I don't have a combi boiler.

Dave

 

[kayedee]

Dave,
Could just be a bit of an air lock, try turning off all the other radiators to push the air through, when it gets hot turn the others back on.

 

[Burnerman]

Dave, if the radiator bleeds well, then you may just have a balancing problem...there's some info in the FAQ's but essentially its forcing water round a path (that radiator) which the water finds easier to avoid.
Try turning some of the other rads off, and see what happens.
Often enough, the lockshield valves only need to be 3/4 of a turn for the flow to be fine.
John