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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!

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    Screenshot 2017-12-02 09.53.22.png

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  2. Last Plumber

    Last Plumber Plumber GSR

    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)

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  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
     
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