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Thermostat (2nd generation) shows E72 while not wired at all!

AliNaddaf
Community Member

‎01-20-2025 10:24 AM

Hi. I have a 2nd generation thermostat that at some point I had used it but for the past couple of years had been unwired and unused, sitting on a shelf. I grabbed it yesterday to use it for a friend and it didn't turn on at all, so I connected it to a USB charger and let it charge over night. Now when I start the installation process, it says "Equipment detected" and then if I continue, gives me E72 error; it seems it thinks it is still wired while it is not. Any suggestion?

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JuanCH
Community Specialist
Community Specialist

‎01-23-2025 05:13 PM

Hi AliNaddaf,

 

Thanks for reaching out to the community! I'm sorry your Nest Thermostat 2nd Gen won't turn on. Let’s fix this! I also appreciate all the efforts in trying to resolve this situation.

Based on the error code you got, it seems your Nest Thermostat does not recognize your wired installation. To check it, I’d like to suggest checking this help article: Troubleshoot Nest thermostat help codes to isolate the situation.

Keep me in the loop, and I can assist you with the next steps.


Best regards,
Juan

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