One rad not working but trv is hot

[Ryanb26]

Hi trainee plumbing here trying to understand why one upstairs rad wont work.
All other radiators around house are working fine expect for the second bedroom (2/3)
The flow pipe going to the TRV is piping hot and the TRV its self is hot but the radiator is not.
The lock shield is open and i have bleed the rad and no air comes out just cold water.
Its plastic microbore pipe and on a newish house 5 year old.
any ideas what the problem could be?
Cheers

 

[Rickster123]

Hi trainee plumbing here trying to understand why one upstairs rad wont work.
All other radiators around house are working fine expect for the second bedroom (2/3)
The flow pipe going to the TRV is piping hot and the TRV its self is hot but the radiator is not.
The lock shield is open and i have bleed the rad and no air comes out just cold water.
Its plastic microbore pipe and on a newish house 5 year old.
any ideas what the problem could be?
Cheers

Take the trv head off and give the pin a whack

 

[Ryanb26]

Ye i forgot to mention i tried that and messed with the lock shield. Since then the rad has got some heat into it but its not warming up as much as the others.

 

[townfanjon]

Longshot, but prove the lock shield is open ,I.e not nact and closed in the open position, a bit similar to what happens to old gate valves. I you get them every now and then

 

[Chalked]

Rad could be air locked or poor circulation.

 

[manic26]

It could be a blockage in the pipe or if it's a plastic pipe dropping out of a hole turn both valves off take the rad out and check the pipe is not kinked where you can't see

 

[Ryanb26]

a small amount of heat is getting into it now any more ideas?

 

[Ryanb26]

It could be a blockage in the pipe or if it's a plastic pipe dropping out of a hole turn both valves off take the rad out and check the pipe is not kinked where you can't see

BINGO nice one mate!

 

[manic26]

Which one blockage or kinked plastic?

 

[LPC]

You need to hit the TRV pin repeatedly until it will spring back on its own. Sometimes it takes quite a while. I've hit for a very long time then you must accept that a new one is needed.

 

[Ryanb26]

Pipe is kinked coming out of the wall. Need to get a proper plumber in now to drain the system haha