navien ncb dip switches

  1. Dobson

    Help with return water dip switch settings (Navien NCB 240e)

    I’ll keep this as short as possible. I’ve read the manual and scoured the internet and have yet to find a clear answer here. I have a brand new Navien NCB 240e that so far has given me nothing but problems. However, I’m slowly finding out that my problems are from an incompetent installer and...
  2. John D Wilkinson

    Navien NCB 240 Service Manual Errata?!?

    I've been chasing some error codes and operation issues on my Navien NCB 240. It appears as though I have half-stumbled into a solution. My six year old combi was setting an "012", and performing erratically whenever it did run. I did a by-the-book diagnostic using a .pdf service manual I...
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