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Discuss Problem with one radiator but can't see what to adjust in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. LeonN

    LeonN New Member

    Hi,

    Central heating looks to be ok on 6 of the 7 radiators in my house (2 floors). Heat flows as expected.

    But there is a problem with the radiator in the front bedroom, which remains cold (top and bottom of radiator). I've bled it several times and now water comes out straight away so don't think that's the problem.

    I looked at some videos which mentioned a thermostatic radiator valve and also a 'lockshield' - so I was hoping that was the problem here.
    But looking at the radiator - on both sides I see this (after removing the cap (screwed in) - pictures below.

    I can't see anything obvious to adjust. But other than bleeding the radiator, I can't see what else to check/change.

    Now I do note the two pipes to the radiator are cold, but what is odd is that all the other radiators in the house are perfectly hot
    .
    Boiler/Pump seems fine as well.
    Radiator not been on since about March.

    Any help would be welcome.
    thanks
    Leon

    right side.jpg left side.jpg
     
  2. SimonG

    SimonG Trusted Plumber Top Contributor!!

    Get a spanner and open the two valves slightly.

    Righty tighty, lefty loosey
     
    • Like Like x 1
  3. Rob Foster

    Rob Foster Top Contributor!!

    So no work has been carried out on this rad at all. Yes no
    Was it turned off at some point when you last used the heating system yes no
    You get water when you bleed the rad yes no not air
    Please answer here and we can get in with solving your problem directly ...Rob Foster aka centralheatking
     
  4. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    From the spindle in the centre not the nut holding it all together.
     
  5. LeonN

    LeonN New Member

    Thank you very much Simon/Rob and Harvest. Rob in answer to your questions,
    • no, nothing has been done on the radiator since march (when it was working fine)
    • when i bleed the radiator, water comes out straight away
    Let me try loosening the valves as suggested and I will update.
    thanks
    Leon
     
  6. LeonN

    LeonN New Member

    ok - so an update.
    Thanks for your help so far all of you.

    Two radiators have this problem (of no heat). Both are upstairs but there are 3 radiators working fine upstairs.
    So on both of the faulty radiators I managed to open the valve on one side only. I tried doing the same on the other side of each radiator but it would not move at all). Its not clear from the above pictures but on the 'valves' on one side, there is an extra bolt attached, as if its not supposed to move.
    Now doing the 'righty tighty and lefty loosey' on each radiator (one side only) I managed to turn it a few times. But this didn't make things better :(
    I thought it may be an imbalance in the central heating, as some radiators are working fine (and are in fact super hot).
    First I thought that:
    • If I move the valve completely to the right (tighty righty) then I end up making the radiator cooler, because I'm preventing sufficient flow to it.
    • If I move the valve completely to the left (loosey lefty) then I end up having a hot radiator but prevent the other radiators from getting enough heat.

    So I selected a super hot radiator, and thought first to move the valve to the right, then was going to move it left a bit at a time. But even moving it to the right didn't cool it down, so thats not correct.

    Have I turned the valves too much ? (for both the working and non working radiators). It didn't change anything in each case.
     
    Last edited: Oct 22, 2018
  7. Ben-gee

    Ben-gee Member

    You need to open the valves on both sides of the radiator to get flow. If you have only done one side the radiator will remain cold. Address this before looking elsewhere .
     
  8. LeonN

    LeonN New Member

    ok -thanks very much for clarifying.
     
  9. LeonN

    LeonN New Member

    Opening the valves on both sides on both 'faulty' radiators did absolutely nothing. It may be my imagination but the whole central heating system seems a bit more noisy now. Lots of clanking and clunking.
    Its very odd - on the radiators which don't work - even when all the valves are open TO THE LEFT, there is no heat in the radiator. I can't even feel any heat in either of the pipes leading to each radiator.
    The radiator valves were in horrible shape, a couple of them got bent out of shape when I tried to turn them with a spanner. Would it help at all to install some new TRV valves ? Do I really really need to drain all the water out of the system before installing these valves ?
    But I would be more optimistic if there was any heat in the pipes at all. This is really frustrating, I've tried different pump speeds - any advice on what else to check ?
     
  10. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    If you are going to that length get an engineer in to give you a price
     
  11. LeonN

    LeonN New Member

    I did try balancing the radiators, and a couple of the (working) ones are now a little cooler - but still working. The 'dead' ones though remain ice-cold.
     
  12. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    As above mate. Time to get a pro out me thinks.
     
  13. LeonN

    LeonN New Member

    Sure - but ideally i'd just like to get those two radiators working again. It can't be the pump as thats new, boiler must be ok as other radiators are fine, both 'faulty' radiators have been bled several times, and this evening i totally opened both valves i.e. twisted them as far to the left as possible, but it did nothing.

    I just noted what a hassle it was to twist the valves and figured new TRVs would be easier in future, but honestly Im more concerned about getting those two rads working.
     
  14. LeonN

    LeonN New Member

    ok thanks
     
  15. Best

    Best Trusted Plumber Top Contributor!!

    I am fairly certain that those radiator valves are the old Peglers Belmont type.
    They have two O rings on the spindle inside each (which are replaceable without turning water off).
    Turning the valves on or off can cause them to leak if they haven’t been turned for a long time - like the LS valve.
    The nut below the spindle is not a packing nut, but just a lock nut preventing the works coming out.
    New valves needed.
     
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