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    Weird problem with Nest & Mitsubishi heat pump

    yungul
    yungul Member Posts: 1
    in A-C, Heat Pumps & Refrigeration
    Hello everyone,
    I use a Nest thermostat which is connected to Mitsubishi heat pump (PEAD-A42AA5) through Mitsubishi through Mitsubishi thermostat interface (PAC-US444CN-1). Cooling/fan starts, continues for 10-15 minutes and then suddenly I get an error on Nest saying that there is a problem with a specific wire. Each time it's a different wire. Cooling/fan stops for a few minutes. Then, I get another notification saying that equipment is detected and cooling/fan starts again. What might be the problem? I checked the wiring several times.
    Thanks in advance,
    Levent

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    Comments

    • STEVEusaPA
      STEVEusaPA Member Posts: 6,505
      The Nest

      There was an error rendering this rich post.

      IronmanSuperTech
    • Ironman
      Ironman Member Posts: 7,714
      Ditch the Nest; it should never be used with modulating equipment.
      Bob Boan
      You can choose to do what you want, but you cannot choose the consequences.
      SuperTechSTEVEusaPA
    • SuperTech
      SuperTech Member Posts: 2,581
      Just because you can connect a Nest thermostat to the system doesn't mean that you should.  Use the thermostat that was designed for the equipment. 
      STEVEusaPA

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