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Half a zone not heating

drosner
drosner Member Posts: 48
in THE MAIN WALL

i have a zone where it tees to 2 baseboards and the other tee goes to 2 radiators. Last season it all was working just fine. But this season I can’t get the radiator path hot. The piping is deep into a crawlspace so I can post pictures and I’m going off memory. But I think the piping goes to one radiator and the output on that goes to the next.

I opened the vent on one of the radiators and I could start to feel that incoming pipe get hot. So I know at least hot water is getting to the radiator and isn’t blocked. Any suggestions what to try to get to bottom of what causing lack of circulation in this section?

Comments

  • Ironman
    Ironman Member Posts: 7,569

    What’s the pressure on the boiler gauge?

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Big Ed_4
    Big Ed_4 Member Posts: 3,046

    You mentioned crawl space , a addition where the heat was tapped into a existing system . You will need to post a diagram of your system ..Correctly trace the pipe work . Confusing ? You mentioned baseboard and radiators ? Two different animals ….It is hard to see from here :)

    There was an error rendering this rich post.

    Ironman
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,590

    Check the pressure you may be air bound or you gauge could be defective.

  • george_culbertson
    george_culbertson Member Posts: 3

    Air in the system or you don't have a pressure difference from input to output of your rads on the same piping circuit. You can accomplish this by closing off a tiny bit to create pressure differential for the rads or base board Depending upon which. Hence water will now start to move and now you heat.

  • LRCCBJ
    LRCCBJ Member Posts: 476

    I opened the vent on one of the radiators

    Did you get air…………or water?

  • drosner
    drosner Member Posts: 48

    when I vent I get water only and no air…..pressure on main system looks solid where it normally is. Could, the air be downstream of the 2 rads on return line?

  • Ironman
    Ironman Member Posts: 7,569
    https://forum.heatinghelp.com/discussion/comment/1827112#Comment_1827112

    Please give the specific pressure: a generic answer doesn’t help.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • drosner
    drosner Member Posts: 48

    gave up trying to debug myself and called plumber….he ventured deep into my crawl space where radiators were located. I always thought they were plumbed in a loop. Turns out the guy who did the install used pex T to split the supply and returns to go to the 2 radiators. Plumber said this ain’t good and if I had it working before I got lucky and it won’t last…picture shows supply coming off main branch with 2 closely spaced tees (which is ok)…but then tees to go to 2 radiators.

    IMG_0872.jpeg

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