Recent content by John DC

  1. John DC

    Navien 240A compatible with NR-21DU?

    Hello, I have an NR240A which was installed in 2020. I was able to add external recirc and an external pump without a problem using the Parameter list and the dip switches. I purchased an NR-21DU to add a timer to my recircluation. I cannot get it to communicate properly with the 240A. It...
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