Radiator cold at the bottom

[helenamy]

Our radiator in our living room is only luke warm at the bottom and boiling hot at the top. The pipe into the TRV valve is only slightly warm and the lockshield valve is boiling hot. We had the radiator refitted after some plastering around October last year. The radiator is the closest one to the boiler too. Anyone got any ideas please or do I need to get someone in to look at it?

 

[oilhead]

Is your TRV bi directional? It is obviously on the return. Are you sure the TRV is fully open?
Is your lockshield fully open?

 

[helenamy]

I’m not sure if the TRV is bidirectional, I’ve taken a photo if that helps? Will check the lockshield - if I try and open that further will the rest of the system need balancing?

 

[Harry Bloomfield]

Is your TRV bi directional? It is obviously on the return. Are you sure the TRV is fully open?
Is your lockshield fully open?

The spec. seems to suggest it is bi-directional.

 

[gas112]

plumbcentre bulldog valve bi directional ...
open lockshield fully then turn off all your other rads and leave this one on by itself for about half hour then open the others back up .

 

[Justin Passing]

Unscrew the top of the TRV (big knurled chrome nut)
There should be a pin in the middle of the fixed part. Make sure it springs up and down a few mm. They can partly stick. You should eg be able to bounce a small hammer on it.

Bidirectional TRVs often muck about when on the return. It's worth swapping them if nothing else works.