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Nest thermostat and C-Wire help

Juneau
Community Member

‎01-05-2025 04:14 AM

Hoping someone can help out with wiring a Nest Power Connector.  I followed the basic instructions for the power connector and the breaker in the panel wanted to trip.

Here is an image of the board.

Carrier 9 Terminal Board 

Starting with the top row of 5 the diagram on the furnace is this: 1=L,  2=R, 3=O , 4= C, 5 = W3.  Second row of 4: 6=G, 7=W2, 8=Y , 9=E

Current wiring on the board has red thermostat wire to 2 (R), 4 has a thicker yellow wire from electric supply, 6 has green thermostat wire,  7 (W2) has a jumper to 9 (E) and white thermostat wire to 7. 

The blue thermostat wire is pigtailed to thicker yellow wire that is also from electric supply.  This yellow wire is different than the one connected to terminal 5.

When I connected the power connector Red to 2 (Red), C to 4 (C), G to 6 (G), W to 7 (W2), Y to pigtail.

Any suggestions?

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3 REPLIES 3

GabrielaG
Community Specialist
Community Specialist

‎01-09-2025 10:23 AM

Hi 

 

Thanks for reaching out to the community. I understand that you need help with the wiring of the Nest Power Connector. I'm happy to assist you right now.

I appreciate the wiring information you provide me. To get a better understanding of the situation, please help me out by answering the following questions:

  • What type of Nest Thermostat do you have?
  • What kind of HVAC system do you have?
  • Do you see error codes on the thermostat screen?
  • Can you please send me a picture of your current thermostat wiring?
  • Can you please send me a picture of the control board wiring? 

Any additional details you can provide will be helpful.

 

Regards,

Gabriela

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Juneau
Community Member
In response to GabrielaG

‎01-09-2025 04:08 PM

Hi Gabriella,

Thank you for responding.

The thermostat is a Nest Thermostat, 2020 version.

Electric forced air HVAC system.

No error codes on the thermostat screen.

Picture of wiring thermostat wiring attached.

Picture of control board wiring attached.

I included a picture of the control board with the diagram of connectors on the board.

When I connected the power connector Red to (Red), C to (C), G to (G), W to (W2), Y to pigtail the breaker wanted to trip.

Thank you for your help.

image.jpeg

IMG_5139.jpg

IMG_5140.jpeg

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GabrielaG
Community Specialist
Community Specialist
In response to Juneau

‎01-09-2025 05:04 PM

Hi ,

 

Thank you so much for keeping me updated. I appreciate the time you have taken to answer my questions and the information you provide me. I'm happy to continue assisting you right now.

  • Before you start, turn off the breakers of your HVAC system.
  • I recommend installing the power connector at the zone controller. You can refer to this Installation Guide, for your reference, you can watch this video How to install the Nest Power Connector.
  • Check Nest Power Connector and your power status:
    • Turn on the breakers
  • Make sure your thermostat is set to Off mode. 
  • On your Nest Thermostat, select Settings  
    • Equipment. 
  • Select Power Connector  
    • Power test.
  • Wait for the power test to finish, and then select Done.
  • To confirm, select Settings 
    •  Equipment  
    • Power Connector  
    • Power Status. 
  • The screen should now read “Nest Power Connector Detected.”

Let me know how it goes.

 

Regards,

Gabriela

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