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Google Nest External Power

Community Member

I got a Google Nest and Google external power. Need to know how to wire the power directly to my thermostat, I see a “c” connector but not Rh as mentioned in several videos



Community Specialist
Community Specialist

Hi Hmlongobucco,


Thanks for posting here in the Google Nest Community. I'd be happy to help you with this. You'll need to install the Nest Power Connector on your HVAC control board, find the series of labeled terminals on it, and install the power connector there.

You can install the power connector yourself, or call a pro. For a brief video of the installation process, go to How to install the Nest Power Connector.

Note: If your system doesn’t have a C terminal, you’ll need to call a pro.

Before you start

  1. Finish installing your Nest thermostat before you install the power connector. 
  2. Update your thermostat if needed. 
    • If you have a Nest Thermostat E or Nest Learning Thermostat (3rd gen), you don’t need to update.
    • If you have a Nest Thermostat, select Settings and then Version. If the version is earlier than 1.1, you’ll need to update.
      • To update, first make sure your thermostat is set to Off mode.
      • On your thermostat, select Settings and then Version and then Update. 
      • Get version 1.1 or later. 
  3. If the C wire information that was entered in the app is incorrect, update the wiring info:
    Home app
    • Open the Home app .
    • Tap your device's tile.
    • At the top right, tap Settings and then Thermostat and then Wiring and then Update wiring.
    • Update any incorrect wiring information.
  4. Nest app
    • Open the Nest app and then tap Settings Nest settings icon.
    • Tap Thermostat and then Wiring and then Update wiring.
    • Update any incorrect wiring information.
  5. Turn off power to your system at the fuse box or system switch. This will help prevent damage to your system and help keep you safe. 
  6. Check to see if you’ve turned off the right breaker by changing the temperature with your thermostat. Wait a few minutes to make sure your HVAC system doesn’t turn on.

Feel free to let us know if you have more questions in mind.