Navien Intake Air Problem

Discussion in 'Tankless Water Heater Forum' started by alinford, Sep 9, 2009.

  1. alinford

    alinford New Member

    Messages:
    1
    Location:
    Utah
    I have a CR-240 that is having an air intake issue when I put on the cover. Without the cover, the unit works fine, but once the cover goes on, I get the error that means the system is not betting enough combustion air. There are only 2 45's and a 90 in the 30' run, so we do not have too many turns or too much length.
    Has this happened to anyone else?
  2. zl700

    zl700 DIY Senior Member

    Messages:
    237
    Location:
    Texas
    Blocked outdoor intake screen
    or
    No screen on it and animal crawled in and died inside intake pipe
    or
    Sagging pipe install holding water
    or
    Reversed vent piping
    or
    Blocked intake screen built into intake collar on heater, above premix burner fan
  3. suavecito1177

    suavecito1177 New Member

    Messages:
    2
    Location:
    Denver, Co
    The Navien is a learning unit. If you take the door off and then turn it on, it will learn that environment. What I have done in the past is unplug the unit, make sure your dip switch settings are correct and the power switch inside the unit is on. Install the door and wait 10 minutes for the unit to completely drain power. Plug the unit in and hit the power button on the controller. If you have an A model with recirc and buffer tank and you have a V2.0 control board you will need to turn the recirc on at the controller, not just by dip switch. Should take care of any intake air issues. I live in Denver, Colorado and with our altitude we have run into these issues alot. Let me know if that helps.
  4. zl700

    zl700 DIY Senior Member

    Messages:
    237
    Location:
    Texas
    What exactly does the Navien learn and how?
  5. ronrca

    ronrca New Member

    Messages:
    7
    Location:
    Canada
    Blocked intake screen built into intake collar on heater, above premix burner fan

    I have the same model and the same error message came up twice in the time we moved into our new house since Sept 09. Both times it was the internal intake filter was dirty. The manual shows how to access and clean the filter. Works fine after its clean.
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