Navien Ncb 240 boiler not turning off

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Jerry2x45, Dec 2, 2018.

  1. Jerry2x45

    Jerry2x45 New Member

    Joined:
    Dec 2, 2018
    Location:
    Long Island, ny
    my Navien ncb240 is not shutting off when the thermostat is satisfied and the zone valve closes the pump and the boiler is still running. I thought I had a faulty zone control switch. I changed it and still have the same problem. I took power away from the pump as well and the boiler is still running.

    Help.
     
  2. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    Is there an outside sensor
     
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  4. Jerry2x45

    Jerry2x45 New Member

    Joined:
    Dec 2, 2018
    Location:
    Long Island, ny
    Thanks for your reply

    No outside sensor
     
  5. Jerry2x45

    Jerry2x45 New Member

    Joined:
    Dec 2, 2018
    Location:
    Long Island, ny
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