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Cannot complete setup of Nest Thermostat

a10brink
Community Member

a week ago

I am trying to setup a new Nest Thermostat and am receiving a cannot detect C error message.  I have confirmed that there is 22.37 VAC between C and R at the thermostat.

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1 REPLY 1

kcruzgonzalez
Community Specialist
Community Specialist

Friday

Hi @a10brink,

 

Thanks for reaching out in the community. I understand you're seeing a "cannot detect C wire" error message when setting up your new Nest Thermostat, even after confirming 22.37 VAC between the C and R wires at the thermostat. It's important to get your thermostat set up correctly, and I'm here to help.

It's great that you've already tested the voltage and confirmed power to the C wire. This helps us narrow down the possibilities.

  • To help me troubleshoot further, could you please provide a few more details?

  1. Could you confirm the exact model of the Nest Thermostat you're trying to set up?

  2. When you connected the wires, did you follow a specific wiring diagram or the instructions provided in the app?

  3. To give you the most accurate assistance, could you please share photos of your previous and current wiring? This will allow us to compare and identify any potential issues. You should find a camera icon or "Insert photos" option when replying to attach the images. If you don't see this on your mobile device, please try using a different browser or a computer.

I'll look forward to your response so we can work towards getting your Nest Thermostat up and running.

 

Regards,

Kevin

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