2 new radiators - only 1 warms up

Discussion in 'Plumbers' Talk' started by kamy, Jun 16, 2008.

  1. kamy

    kamy New Member

    I added two radiators in my attic - the first rad is working fine and warms up however the 2nd rad is cold - (both have same fittings trv and thermostats). I swapped thermostats over but the problem remains.

    The 2nd rad is further away from the pipes that are coming from downstairs - I have checked for leaks and air - the 2nd rad contains water because I bled the rad to remove air.

    Should the hot pipe running to the lockshield valve on the 2nd rad be warm?
    Could there be a blockage in the pipe to the 2nd rad?
    What have I missed and how do I fix this problem? (Thanks in advance).
  2. Captain Leaky

    Captain Leaky New Member

    Just the usual :

    Turn off all other rads - does it now get hot?

    Where and how did you tee in the new rad? it may be bad plumbing.

    Open the rad union slightly ( careful! ) while the system is on to force water thru that rad.

    Identify a pipe going hot then cold - there is your blockage, if there is one.
  3. rome60

    rome60 New Member

    Hope you have a pressurised system,or if open vent your tank head is high enough.;)
  4. Mr Ian

    Mr Ian New Member

    Turn off first rad - is it warm now?
    Could be blocked flow/return (PTFE tape....) or bad plumbing
  5. kamy

    kamy New Member

    This is a pressurised system.

    Could this be a faulty thermostat connector on the rad?

    I have connected the rads as shown below. (i am only showing the connections to the lockshield).

    (RAD 1)
    I (incoming pipe)

    The pipe going to the second rad is warm up to the halfway point.
  6. Captain Leaky

    Captain Leaky New Member

    I don't get your drawing :(

    I doubt it is a faulty TRV, you can take the head off anyway to test it... I suspect poor plumbing?
  7. mainman

    mainman New Member

    could be you have got 1 way trvs and you have it on wrong leg
  8. Mr Ian

    Mr Ian New Member

    Not likely - get a plumber in you cheapskate. This is a forum for plumbers and CC/CCCs/CCCCs/CCCCCCCs/ not DIYerS.

    Couldn't resist :)

  9. kamy

    kamy New Member

    UPDATE - The lockshield valve on radiator 2 was blocked, so I cleaned the valve and both rads are working fine. Thanks for the replies.

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