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My Google 3rd generation thermostat keeps getting an E 79 error every time we lose power?

MikePig
Community Member

2 weeks ago

It will work again when I remove the face plate or trip the breaker.  Any idea how to permanently fix the problem?  Im thinking new thermostat?  Thank you

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1 REPLY 1

Derickf
Community Specialist
Community Specialist

a week ago

Hi @MikePig,

 

Thank you for posting in the community. I understand that you're getting an “E79” error code in your Nest Learning Thermostat 3rd gen after every power loss, and I appreciate you letting me know the steps you follow to make it work again. I'm glad to share more information with you.

The “E79” error code on your Nest Learning Thermostat 3rd gen indicates a temporary loss of power on the C wire, and this notification will always appear when you have a power outage. Instead of removing the display, we would recommend performing a soft reset by pressing and holding the display for 10 seconds to avoid damaging the base plate and terminals.

Please keep me posted if you have any other questions.

 

Best regards.

Derick.

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