Please help! 1 cold radiator

[SGraham99]

View attachment 368174

Top and left side of the rad now hot but nothing at the bottom. Similar to the rad on the other side of the wall

 

[Stuckinarut]

Top and left side of the rad now hot but nothing at the bottom. Similar to the rad on the other side of the wall

Can you post one with the lockshield cap removed? Also, try removing the trv head, see if any improvement.

 

[SGraham99]

Can you post one with the lockshield cap removed? Also, try removing the trv head, see if any improvement.

Swapped the trv head with one from a rad that was working

 

[JohnD]

half an hour after starting the heating from cold

 

[SGraham99]

Will try again tomorrow from cold. Is there a reason it has to be half an hour from cold? Thanks

 

[JohnD]

So you know you're starting from cold. Give it time to stabilise, cold or hot.

Don't keep checking or changing anything more frequently

 

[cross thread]

The thermostat valve body pin maybe free but the valve can stick,can you remove to check?

 

[JohnD]

Turned a very hot radiator off and now the pipe feeding the cold rad is too hot to hold but actual rad is barely warm.

Flow is entering the radiator, so the TRV is not jammed shut.

 

[cross thread]

It may be partially open JohnD but not enough for a decent flow