1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Downstairs radiators not getting hot

Discussion in 'Plumbing and Central Heating' started by NickCurtis62, 25 Jan 2017.

  1. NickCurtis62

    NickCurtis62

    Joined:
    10 Nov 2012
    Messages:
    31
    Thanks Received:
    0
    Country:
    United Kingdom
    My setup.
    1. Radiators downstairs & upstairs
    2. Hot water tank, header tank etc in loft
    3. Gas boiler - old type, not an 'on-demand' type

    My problem.
    Upstairs getting hot but downstairs not except one that only get's slightly warm at the top, and i think this is only happening due to hot water being pulled by gravity from the radiator directly above it upstairs.

    What have i tried?
    1. Powered up the boiler and turned up the temp for both heating and water.
    2. Bled all radiators - trying with and without the boiler on. Not much air escaping when i tried this. Pretty much water coming out from the get go.
    3. Water pump up in the loft appears to be running but does feel very hot. This is the pump for the radiators is it?
    4. All radiator valves are open.

    Can't think of anything else obvious to check.
    Any idea's would be appreciated.
     
  2. Sponsored Links
  3. Jadele

    Jadele

    Joined:
    10 Jan 2017
    Messages:
    390
    Thanks Received:
    50
    Country:
    United Kingdom
    shut off the upstairs rads and see if the downstairs get hot
     
  4. NickCurtis62

    NickCurtis62

    Joined:
    10 Nov 2012
    Messages:
    31
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks for the tip - tried it but no change
     
  5. 75pete

    75pete

    Joined:
    9 Apr 2008
    Messages:
    663
    Thanks Received:
    60
    Location:
    London
    Country:
    United Kingdom
    Try this; remove bleed screw of the pump. Now with the pump running, check that the pumps impeller is spinning.
    Expect some water once you remove this large bleed screw, so have a cup etc to collect the small amount of water.
    Also see FAQs 14 & 20 before starting the above.
     
    Last edited: 25 Jan 2017
  6. gigz

    gigz

    Joined:
    7 Oct 2006
    Messages:
    8,547
    Thanks Received:
    2,344
    Country:
    United Kingdom
    What he said. Or is your heating on two different zones ? Pics would be helpful.
     
  7. Sponsored Links
  8. NickCurtis62

    NickCurtis62

    Joined:
    10 Nov 2012
    Messages:
    31
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks for your replies people.
    Going home now to check out this pump. Have a replacement one just in-case!

    Do i need the pump under power when i remove the bleed screw? I'm assuming under power
    but thought it best to check. If the pump is spinning/pumping what next?

    Any pointers on changing the pump? What should be turned off other than power to the pump?

    FAQ's 14 & 20? Tried looking at the top of this Forum but the FAQ's there don't have 14 & 20.
    What are they in brief?
     
  9. Stadan20

    Stadan20

    Joined:
    21 Sep 2015
    Messages:
    3,436
    Thanks Received:
    862
    Location:
    Wiltshire
    Country:
    United Kingdom
    My money is the pump
     
  10. NickCurtis62

    NickCurtis62

    Joined:
    10 Nov 2012
    Messages:
    31
    Thanks Received:
    0
    Country:
    United Kingdom
    Well, tried an identical pump and the fault is the same as at the start.
    Set the pump to No.3 and shut down all upstairs rads but no difference,
    even after 30 mins running on No.3
    Open up upstairs rads and warm within minutes.
    Anymore idea's out there?
     
  11. Davidl66

    Davidl66

    Joined:
    26 Jan 2017
    Messages:
    5
    Thanks Received:
    1
    Country:
    United Kingdom
    Isolate one of the radiators downstairs that don't work. On both sides remove the radiators and slightly open the valve to see water flow
    Ifrom water is blackish or brown I'd advise you to get a good power flush.
     
  12. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page