Posting a message to the forum will remove the above advertisement

Discuss Old rad only getting warm on one side, whats the problem? in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Simon-7613

    Simon-7613 New Member

    Hi all, we moved into a new apartment in the summer and now it's cold and the heating is on I've noticed that one of the rads is only getting hot on one side as shown in the photos.

    Does anyone have any ideas what the problem could be and what the solution is? Thanks in advance!

    IMG_1410.JPG

    Screenshot 2017-12-02 09.53.22.png

    IMG_1411.JPG

    IMG_1413.JPG
     
  2. Last Plumber

    Last Plumber Plumber GSR Top Contributor!!

    What type of boiler?
    Make and Model Please?
    It could be a case of opening one of the valves a bit but we need to know what type of system it is.
     
  3. SimonG

    SimonG Trusted Plumber Top Contributor!!

    Waters lazy, takes shortest route. That rads probably always been like that. Open the valves fully.
     
    • Agree Agree x 1
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Agree with the above or there's a blockage in the 3rd fin
     
  5. Simon-7613

    Simon-7613 New Member

    Thanks for your feedback.

    The boiler is a Baxi Novanox 24/24F - (see added pic below)

    The valve (on the top of the rad) is fully open.

    I’ve heard the rad could need ‘de-sludging’, is this possible without fully removing the rad?

    On a side note, from what I understand it’s not going to be air as this would cause the rad to be cold at the top and not on the side - but how do I bleed this type of rad? Do I undo the brass nut slightly at the valve ( as seen in the pic) to release the air?

    Thanks in advance, much appreciated

    A24D0EEB-5951-4AF2-A171-AFC88B60D96C.jpeg
     
  6. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Have you tried opening the bottom valve 1/2 a turn more ?
     
  7. Simon-7613

    Simon-7613 New Member

    Have just tried loosening the bottom rad valve 1/2 turn but no change
     
  8. sammathias

    sammathias GSR

    Probably just air...
     
  9. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    I have found that the air only settles at the top if both valves are at the bottom. Yours are both on one side. Is there a vent point on the top left hand side of the radiator?
     
    • Agree Agree x 1
  10. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

  11. Simon-7613

    Simon-7613 New Member

    No, no vent valve there (see new pic)

    8FA1F97E-DBE5-4B67-ABDD-692EB62D92F2.jpeg
     
  12. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    How about bottom left?
     
  13. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Might be on a fin
     
  14. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Not by looking at that rad mate. But you could be right. I bet it has always been like that and it is air locked. Give it a good whack and hope the cast doesn’t split.:p:p:p:D:D
     
  15. Simon-7613

    Simon-7613 New Member

    Bottom left is the same as top left. Checked all the fins, front and rear, no additional valves etc.

    Al I have to play with are the two valves as show in the photos at the top-right and bottom-right.

    For the top-right, apart from opening and closing the valve, I don't see any available adjustments.

    For the bottom-right I can adjust with an 8mm allen key

    I thought the bleed valve was always at the top, am I wrong in this presumption?

    Cheers
     
  16. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Yea normally always top or top side

    Looks like it wasn't fitted from new

    If you can't find one best get one fitted
     
  17. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Otherwise it will never work properly.
     
  18. Simon-7613

    Simon-7613 New Member

    Ok, thanks. Any pointers in the right direction for sourcing the correct bleed valve for this rad and fitting it would be much appreciated :)

    Thank all!
     
  19. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Black iron reducer possibly from 11/4” down to 1/2” bleed point. (Vague description sorry) on my way out. Make sure they are sealed properly:eek::eek::eek:
     
  20. Simon-7613

    Simon-7613 New Member

    BTW, what is the valve on the bottom-right for?
     
  21. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Normally used to balance the system. Should have a cap on really
     
  22. Ric2013

    Ric2013 Plumber Top Contributor!!

    I'm going to agree with the air camp. On the grounds that, while water is lazy and finds the shortest route, my limited experience with flow and return on same side of radiator is that, particularly on high water volume radiators, the hot water will settle across the top first.
    If there is air, the water will splash about and not fully fill the radiator.

    If fitting an air bleed valve as suggested does not cure problem, I have a private suspicion that you might need to close the bottom valve slightly in case water is running through too fast. Which makes little sense to conventional thinking, but, if you have to do this and it works, please do let me know.
     
  23. SimonG

    SimonG Trusted Plumber Top Contributor!!

    Ideally repipe bottom connection to opposite side and remove blank to top left and fit air vent.

    Then you will have old school tboe.
     
    • Like Like x 2
    • Agree Agree x 1
  24. oilmark

    oilmark New Member

    Get a wire brush on a drill and scour off the paint on the top left joint, I can see a screw slot. That may be the bleed.
     
  25. sammathias

    sammathias GSR

    Turn off top valve, crack top nut slowly to release any air from the rad. Tighten up and open valve back up...you could also try turning off a valve on all you other rads apart from this one and see if it pushs all the air out.
     
  26. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Bloody good shot Sir. Good eyesight Sir. Well done Sir. Didn’t see that one coming Sir.:p:p:p
     
  27. Simon-7613

    Simon-7613 New Member

    A great idea but a scrape shows no screw head :(

    2C36FB15-2AC1-4A4D-A794-E21A6AE0A661.jpeg
     
  28. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Worth a try though
     
  29. Simon-7613

    Simon-7613 New Member

    ...for sure

    What about the idea of it need ‘desludging’, I could imagine one of the joints between fins being blocked, is there a way to check this or anything else I can try to resolve this issue?

    Cheers all!
     
  30. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    I still think that your best option is to put a vent/bleed point top left of the radiator mate.
     
  31. sammathias

    sammathias GSR

    What i said.
     
  32. king of pipes

    king of pipes Trusted Plumber GSR Top Contributor!!

    Needs repiping tboe the plug can be drilled and tapped for a manual air vent . kop
     
    • Like Like x 1
  33. Simon-7613

    Simon-7613 New Member

    I’ve now tried turning off or down the other rads with the exception of this one where I’ve opened the Trv fully and closed in slightly the 'exit' valve and the middle fin is starting to feel warmer now, more at the bottom than the top. If this is dislodging and moving any 'gunk', does this get filtered out somewhere or does it just move around the system?

    Cheers
     
  34. king of pipes

    king of pipes Trusted Plumber GSR Top Contributor!!

    It will move around , kop
     
    • Agree Agree x 1
  35. sammathias

    sammathias GSR

    Sounds like just air to me. If you left bottom valve open. Turn off top valve then crack open top nut where it fixes to the rad you may find it will release alot of air.(use a container of some sort tho. You will have some water)
     
Loading...
Similar Threads - getting warm side Forum Date
radiator only getting warm Central Heating Forum Dec 1, 2017
Water not getting hot enough Plumbing Forum Tuesday at 9:24 PM