New radiator staying cool at the bottom

[dougie212]

I've just fitted a new radiator with Drayton TRV and lockshield. I understand that the valves are bi flow and so for ease of access the TRV is on the right of the radiator. The radiator is heating up but is staying cool at the bottom and I have lifted the floorboard at the trv end and that is also cool too. I have isolated that radiator and it does eventually warm through but doesn't heat up as normal, the bottom and right hand corner almost just conducts the heat rather than gets hot if that's makes sense. I've tested the pin in the trv and it will push down a little and springs back up. I was going to try and put some central heating cleaner through and see if that helped, and either move the sludge or release a possible airlock but I'm a bit baffled. Would the easiest thing be to take the rad off and make sure the trv is opening? My boiler is a combi boiler, and prior to the new rad and new valves going on the old smaller radiator heated up fine. All other radiators heat up lovely, I just have a feeling nothing is passing out of the trv side of my new radiator.I'm stumped... thanks in advance.

 

[PlumbBobBob]

is it a bi-directional trv? can you see any arrows on it at all? do you know the model number of it?

 

[Frog67]

Sounds like an airlock,just double check both rad valves are open, check system pressure at boiler,if ok you could turn off the other rads and see if that cures it

 

[Dotty]

Sounds like an airlock,just double check both rad valves are open, check system pressure at boiler,if ok you could turn off the other rads and see if that cures it

So how do you come to that conclusion?

 

[Frog67]

So how do you come to that conclusion?

Err... rad not getting hot, all others seem ok, bi-directional TRV, luke warm pipes to valves.
I thought it was always best to try the easiest things first.
I could be wrong though

 

[Dotty]

Err... rad not getting hot, all others seem ok, bi-directional TRV, luke warm pipes to valves.
I thought it was always best to try the easiest things first.
I could be wrong though

You see the bit where it says cold at the bottom. ....

How long did you say you were out of the game?

I'm not having a dig mate, I'm honestly using this as a gentle reminder that it's important to read the whole question before committing an answer. Learning to learn again is probably the hardest part of the ACS. Especially for us older boys.....

 

[Dotty]

Actually. ..... now I've had a think on it. .......

Carry on Froggy old son. I've not had a lot of sleep this last month. I'm finding just lately it's wood and trees.......

 

[Frog67]

Fair point, but he is asking should the easiest thing to do would be to take the Rad off?
My opinion would be to close the other Rads down to see if that sorts it before doing anything more drastic.
Makes sense to me

 

[Dotty]

Fair point, but he is asking should the easiest thing to do would be to take the Rad off?
My opinion would be to close the other Rads down to see if that sorts it before doing anything more drastic.
Makes sense to me

Always worth a punt.

 

[Frog67]

Yep