Rad not heating up. Warm water through both valves.

[2021bela]

I have a house with 15 rads in it. In a bedroom upstairs I have a rad that isn't heating up. This rad was moved about 5 years ago with 1/2inch plastic pipe to new location in the same room but was never turned on.

Tonight I tried to blead it but then removed the rad, emptied it and when off I opened the two rad valves to let the water flow through. Some cold water first then both valves had hot water running through them into a pot. I put the rad back on, opened one valve till the rad heated up while I had the vent opened. Closee the vent, opened the other side valve then the rad got lost its heat!

I'm now baffled as to why this done this and won't heat up like every other rad in the house.

 

[Deleted member 120897]

If the system was balanced initially and now you’ve decided to bring another rad into it then you’ve probably upset the balance. I would say it needs balancing to the rest of the system.

 

[2021bela]

I tried to balance it again last night and it still won't heat up. It's baffling me thst there's hot water to both valves yet when I turn it on, it goes cold. I've even turned every rad off to try force the heat to it and the sane, it goes cold!

 

[ShaunCorbs]

are you sure its piped up correctly eg not both onto the flow etc as youve sorta proved it wont work eg by turning all but the problem one off

 

[2021bela]

are you sure its piped up correctly eg not both onto the flow etc as youve sorta proved it wont work eg by turning all but the problem one off

It was working fine before it was moved. 2 pipes, one from flow, other to return.

If it was piped from same pipe, would it still not heat up abit thou.

 

[ShaunCorbs]

Did you use the same connections

No as there’s no flow

 

[king of pipes]

If it worked before then it should work again was it not heat tested when moved ? ensure the system is full and vented rad valves are fully open run the heating, close off rads that do get hot this may push the heat through the problem radiator . Regards kop

 

[Deleted member 120897]

Is it piped in plastic? Kinked pipe perhaps?

 

[2021bela]

Is it piped in plastic? Kinked pipe perhaps?

Yeah it's plastic. Can't see it being a kinked pipe because I'm getting hot water through both valves.

Would going up and over joists cause issues rather than through joists. The rad was on a wall where there's a void behind it. Pipe coming up through the floor for rad valves. I drained the system, removed the pipe with valves on them. Added new pipes to the plastic elbows and brought them up and over the joists in the void then back under the floor in same room for new rad location.

 

[2021bela]

If it worked before then it should work again was it not heat tested when moved ? ensure the system is full and vented rad valves are fully open run the heating, close off rads that do get hot this may push the heat through the problem radiator . Regards kop

Wasn't testes when moved. Just left as is because room wasn't getting used.

I haven't vented all rads but all heating up. This is why I thought no need to vent.


Are you saying, Open up all valves while heating is on. Vent all rads. Start closing off all rad valves down stairs then continue to close off rad valves upstairs while leaving this rad valves fully open.

 

[2021bela]

Did you use the same connections

No as there’s no flow

New connections at new location. Old elbow stayed in place.

 

[king of pipes]

If your full and vented and it's the only one not heating ? then yes close off others temporarily see if it moves

 

[2021bela]

If your full and vented and it's the only one not heating ? then yes close off others temporarily see if it moves

Yep, this one only one not heating. Hot water gets to rad valve when rad off but when I connect it up, stops heating.

 

[2021bela]

If your full and vented and it's the only one not heating ? then yes close off others temporarily see if it moves

Just for clarification, is closing off all rad valves the same and keeping this one rad open.

 

[king of pipes]

Yes it is you may not need em all off do a few first ok