Radiator stuck on hot

Discussion in 'Plumbing and Central Heating' started by Wonderhorse, 13 Apr 2017.

  1. Wonderhorse

    Wonderhorse

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    Rad 1.jpg Rad.jpg

    I have a radiator that is stuck on hot. The knob turns correctly, but it just stays hot.

    Any help would be appreciated.

    Thanks.
     
  2. PrenticeBoyofDerry

    PrenticeBoyofDerry

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    Give the pin on top of the valve, a gentle tap, it is likely seized in the on postion. The pin should move up/down when the TRV head control knob is turned.
    So if you try to press the pin and it does not move, it needs some gentle persuasion to free it.
     
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  4. ianmcd

    ianmcd

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    The top of the thermostatic valve looks as if it has popped out, do all the others look the same ? as Prenticeboy said above the pin may be stuck and could have pushed the top part out of the valve, it may just be the design but all the ones that I have seen have all been flush.

    danfoss TEV.jpg
     
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  5. Wonderhorse

    Wonderhorse

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    Thanks for your replies.

    The pin is stuck hard, should I be able to push the pin down with my finger?
     
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  7. PrenticeBoyofDerry

    PrenticeBoyofDerry

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    Yes you should be able to push the pin down, then it should spring back up. So a gentle tap with a lightweight hammer/object could be needed. Don't hit too hard. Then try a bit WD40/lubricant on it.
     
  8. DIYnot Local

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