Plumbed in plinth heaters cold

Discussion in 'Plumbing and Central Heating' started by Pts1, 9 Jan 2021.

  1. Pts1

    Pts1

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    Hi, I'm looking for some advice please. I have a plinth heater in the kitchen that is connected to the central heating system. I have taken the heater out and tested by pouring hot water into it and the fan kicks in, so I know that it is working. I have re connected to the central heating system and bled the heater until hot water is coming through. However, when I close the bleed valve the water is not running through as the return pipe stays cold and feed pipe therefore goes cold slowly. I have tried closing the other radiators to force the water through so I could re balance the system but still get no hot water coming through it.
    Is there anything I am missing that i
    should be doing?
     
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    cross thread

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    Probably a blocked feed or return pipe , is it grey plastic ?
     
  4. Pts1

    Pts1

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    They are metal flexible pipes. I think the feed pipe must be fine as I can get hot water through the bleed valve. How can I check or understand lock the return pipe?
     
  5. Terrywookfit

    Terrywookfit

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    Is the matrix blocked ?

    Has it ever worked. They need a good flow to work.
     
  6. Pts1

    Pts1

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    I have removed it from the system and poured water into it and the fan kicked in, butits never worked since I have lived in this house which is about 6 years. We have a gravity fed system, so not much pressure I guess.
     
  7. SpecialK

    SpecialK

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    Assuming you can remove the radiator... does water flow out of the flow and return pipes when you open them into a bucket?
    You could link the flow and return with a suitable pipe and see if it gets hot?
    Do you know where the pipes are plumbed in to your system? Perhaps they are both on the flow side?
     
  8. nortonj

    nortonj

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    I alwats bin the flexi pipe supplied as they are very restrictive, and just pipe in 15mm plastic.
     
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