green wire

  1. James Cao

    Navien NHB Condensing Boiler and Nest Thermostat

    Hi All - new to the forum and would appreciate some expert guidance I would like to install a Nest to control the boiler. the old thermostat used 2 wire (R & W), which are connected to CN10 on the NHB board. I have added a blue and green wire to provide power to the thermostat but don't know...
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