Radiators Not Heating Up??

[Inked]

Hi guys


I've not long moved in to a new property and im having problems with two radiators not heating up.

One of them is quite close to the boiler and i can feel one of the pipes (the one without the TRV) going to it is getting hot but the other one is cold.


And the other radiator is the furthest away from the boiler but both of the pipes going into it are cold. the strange this with this one is that there is another radiator right next to it and it works perfectly.


Does anyone have any ideas whats going on with them?

 

[oss]

Could be the trv's are stuck in the closed position, try taking the thermostatic head off and press the pin, if it does not move , its in the closed position, try gently tapping it , the valve that is, not the pin to see if it will free off, also check the lock shield valves are open.

 

[Inked]

Could be the trv's are stuck in the closed position, try taking the thermostatic head off and press the pin, if it does not move , its in the closed position, try gently tapping it , the valve that is, not the pin to see if it will free off, also check the lock shield valves are open.

Thanks for the reply

Sorry I should have said that I've already checked the trv's and the pins move freely.

Also on one of them the pipes going to the trv and the lockshield valve are both cold.

 

[Inked]

Anyone ?

 

[REEMS]

Have you tried turning off the one that is hot and the furthest one away from the boiler then open the bleed nipple on the one nearset the boiler see if it gets any heat then repeat it with the other rads.

 

[oss]

What type of system have you got, have you got a combi, system, open vented , is it microbore, ?
With microbore the feeds can easily get airlocked and with you just moving in you won't know any work that could have been done , are the rads downstairs, that could be a pump issue , could it be turned up, on a system and o/v the pump is normally easily found.
I've replaced some rads on an open vented microbore system and like yours would not work, I turned off one of the rad valves and opened the air vent fully and drained into a bucket , then repeated with the other one , it took quite a bit of water out before the air lock was cleared, unfortunately for me even though I put towels etc down some water got under the laminate flooring, the next day I get a call saying there was a speed hump in the living room, so I had to replace some of the laminate floor, marvellous!

 

[Inked]

Thanks for all the replies guys

It's a combi boiler.

I had a spare 20 minutes today so I thought I would have another look at these radiators .

I'm starting to think it must be the TRV's being stuck.

First the radiator with only one pipe getting hot (on the lockshield side).

The pin in the TRV is stuck in the open position but I think that although it's stuck open, the seal inside could be stuck closed.

Now on to the radiator with no hot pipes going to it.

I tride bleeding it andoes water come out so I turned off the the lockshield valve and tried again, this time a LOT of air came out and then stopped so I turned the lockshield valve back on and I could hear the water filling the radiator and it started to get a bit warm.

I then bled the remainder of the air out of the radiator and thought that would be ithe fixed.

However it cooled back down again. I felt the pipe on the lockshield side and it's now hot but the one on the TRV side is cold (just like the other radiator) and the pin in the TRV is also stuck in the on position.

I've tried turning off all the other radiators and tapping the sides of the TRV's but I can't get them to work.

Is there anything else I can do to dislodge these trv's?

 

[REEMS]

Only thing really is to drain the system and undo the brass fitting in the top of the valve to have a look to see if its damaged inside if it is while its drained just replace all the valves.

 

[JohnD]

.

 

[Inked]

That's what I was afraid of