Navien NCB-240E Question

Discussion in 'Tankless Water Heater Forum' started by JRL84, Sep 28, 2020.

  1. JRL84

    JRL84 New Member

    Sep 28, 2020
    New York
    Hi Everyone,

    I just had my old Navien CH-210 replaced today with an NCB-240E.
    Here is my issue:

    When I turn on the heat, the unit kicks on and gets up to a range of temperature between 137-142. Within 10 minutes, it will drop below 135 and the unit will once again make the sound as if it is kicking back on. Is this normal or is there a setting I need to change.
    Thanks for the help.
    Last edited: Sep 28, 2020
  2. TEch99

    TEch99 New Member

    Oct 14, 2020
    Sounds like your running on a curve using temp readings from your outdoor sensor and since its still warm in NY it will do what you describe and stop around 140, when it gets colder it will reach the 150 or whatever yours is set to but it will pass the limits your currently seeing. Ensure your outdoor sensor is not laying around indoors.
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