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Thread: Nest Problems

  1. #1
    Join Date
    Jul 2012
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    Nest Problems

    I installed a nest thermostat. I noticed that my Heat pump condensor fan was constantly running when not being called for heat or when the thermostat was OFF. I Called nest and they walked me through some diagnostics. They said my Y1 was shorted and constantly sending power out of it. They sent me a new base. I installed the new one, and ten minutes later i call for heat, shut it off and check the fan an hour later. Still running. I stuck the green wire in the y1 spot and the blower fan immedietly turned on inside. So it appears that this new base they sent me is also shorted!?

    Is it possible that they really could have send me 2 bad base plate. Or is it possible my system is the one shorting these base plates out.



    These are the wires i have

    Yellow - Y1
    Green - G ( fan )
    Orange - OB
    White - in W2 ( aux )
    Blue - C
    Black - * ( Emergency )
    Red - RH



    ( i put a meter accros my Red and Blue and i am getting 27 volts. I don't think this is enough to do damage )

  2. #2
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    and with Y1 disconnected what happens ?

  3. #3
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    Jul 2012
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    Thread Starter
    if i disconnect y1 the condesor fan finally shuts off.

  4. #4
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    Do you have the replaced thermostat to reinstall and check the operation ?

  5. #5
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    Jul 2012
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    Thread Starter
    if i re install the old trane baystat 239. It works fine, when i shut the heat off the heat pump aux and condesnor fan shut right off. ( the issue with this stat was it was not following set point) So it was either full on or off.

    But yes if i re install old stat it works properly.

  6. #6
    Join Date
    Oct 2014
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    Hi newtohvac13,

    If you could send me an email at hvac-talk@nestlabs.com, I'd be happy to check out your case to see what I can do to help.

    It's unlikely that you got 2 bad bases, and with some of the updates that have been done to the Nest base, it shouldn't be easily shorted out either.

    The 27V reading is fine, anywhere between 20-30V is fine for the Nest.

    ~Faris

  7. #7
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    Name:  BATSTAT 239 untitled.jpg
Views: 3217
Size:  103.8 KBIs this your old stat ?

  8. #8
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    Thread Starter
    Yes identical

  9. #9
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    Was the Nest Rep. able to resolve your problem ?

  10. #10
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    Jul 2012
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    Thread Starter
    Not yet. Just sent him some info

  11. #11
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    OK, let us know how it works out. I'm sure he'll be able to assist you.

  12. #12
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    Thread Starter
    Thank you for your help

  13. #13
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    Jul 2012
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    Thread Starter
    new base comes today, i do not want to install it until i hear back from nest. The rep is calling me today.

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