Happy New Year all!

As its a new year I decided to have a look at the radiator in the spare room that has never worked.
Took the old one off, put a new one on and opened the valves both end.
Bled the rad & fired up the central heating.
Nothing.
Every rad in the house still gets hot except this one, how does that work?!?
Turned off all the rads on the top floor (3 off) but left the spare room one on, both valves fully open.
Nothing.
Pipe leading to the valves is hot but nothing past the valves themselves.
But if it was the valves that are the problem then surely water wouldn't fill the rad?
I left the bleed valve open feeding into a bucket but got nothing but clear water feeding continuously into the bucket.
Same thing with the heating on, any air locked in the pipes hasn't moved if it was going to.
One thing I did notice is that all the other rads have a single pipe feeding in and a single pipe returning out. The spare room takes an inlet feed from one pipe that runs along the base of the rad & then returns the outlet to the same pipe.
Ideas most welcome.
Cheers
9TM

The radiator is relying on natural circulation of hot water rising into the radiator and returning. A slower process on the existing setup, but it can be improved if the flow inlet valve is at the top of the radiator with return on the bottom.

As I read you 9 Ton Mantis:the hot supply and cooler water ex the Rad joins into one pipe.
Sounds as if this Rad is at a dead end and not part of a cicuit flowing from hot to cold
When you bled with CH on, was the clear water going into your bucket warm, if so it proves the above and the Rad has been installed wrongly!

Thanks for the quick replies fellas, no aeromech3 (not a Battletech fan are you?!) the water exiting the bleed valve was cold, literally for the entire 5 minutes that I let it flow.
And this despite the fact that the pipe leading to the valves at the bottom is as hot as all the other rads in the house.
I've never had a problem with the hot water or the heating, just this one rad that has refused to heat up for the last 3 years even before I changed it.
We had a baby boy on New Years Eve so I thought I'd get a move on to put our 3 yr old into the spare room & free up her room to use as the baby's room.
I've not changed anything in the system, I counted the turns to close the other rad valves down & then opened them the same way so am confident they're the same & still balanced.
The rad I changed has the same tails, same valves, same inlet & exit points as the old one so am wondering if moggridge has the solution.
Any other comments or ideas please?
I presume Mog that the inlet should be top left & the outlet bottom right?
The system is pumped but if its being pumped straight past the valve & simply relying on the hot water rising then that may explain why it stays cold, but its cold for the entire duration of the heating cycle. I mean, its been on 3 hours now & the rad is still stone cold but the pipe leading up to it is scorching!
One other thing I noticed, when I fitted the new rad, the valves on the bottom were set to the original setting which it appears is fully open both ends.
2 turns each as it happens.
Is this going to play a part I wonder.
Thanks again
9TM

Bet one of the valves is a TRV and the pins stuck

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nothing to help you out with the rad (Though the Scruff is probably on the right track)


But congratulations..

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Verwood Handyman
I Know it says I'm On-line, but I might have just left myself logged in, whilst I'm out....

Just read the post again, and may change my mind.

Does it have a TRV and can you post a pic and details.



You say the pipe leading up to it is scorching, how about the continuation pipe under the rad, is that the same temperature.

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Congrats too. 9TM you'l need to be an ATM!
Had to google Battletech
The Scruff is on your case and will see you right.
About kids good thinking in my books; luckily we kept our kids out of our bedroom from day one and though middle one still has not flown the nest, so far so good, however, youngest is starting to let his 2.8yr old encroach his bed space as realising the downsides

Fixed!!

Thanks for all the replies guys.

The valves are conventional screw down type (lockshields?) not the TRV type so it wasn't a pin issue.

I spent the afternoon pulling the new rad off again, opened both valves into a bucket & got good flow so knew it wasn't them blocked so started to think about airlocks in the pipes.

The original inlet pipework exited the valve then turned down towards the floor before turning up & then turning again to meet the base of the rad. A big curly loop if you see what I mean?

Anyway, the old rad I took off was home made, two singles linked by custom made tops & tails & I suspect it was added after the rest of the CH was installed, almost as an after thought if you like. I'm guessing the pipe work was looped at the inlet end to meet the rad that stuck out further from the wall than was originally planned. Anyway, I junked the loop, turned the valve 180 degrees to point away from the rad & then did a simple, flat U-bend to return the flow from the valve to the rad.
Ugly as sin but you know what, I fired up the CH and wow, the rad works!!
Beginning to wonder how long that rad had sat useless before I looked at it!

Anyway, alls well that ends well, thanks again for the input, just goes to show that even if its there already doesn't mean its right!

Then again it could be a total fluke...!
9TM