E79 code on 2 thermostats after power outage

[Sandy13]

We just had a brief power outage of about 5 seconds. We have 3 nest learning thermostats attached to 2 systems (one is a single furnace with two zones). After the outage, the two thermostats attached to the 2-zone furnace show an e79 error code. I’ve confirmed that the breakers were not tripped and turned them off and on again to double check. Any advice before paying for an HVAC contractor?

[Sandy13 · Accepted solution]

Just pulled both units off the wall for a minute. When I plugged them back in the error message went away. 

[MelbaDT]

Hey Sandy13, 

Thanks for reaching out and for keeping us updated on what you've done to have your concern resolved. We're glad to hear that you now have a thermostat that is working as it should. 

Feel free to let us know if you have any further questions about this. 

Cheers, 

Melba

[MelbaDT]

Hey there, 

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Best, 

Melba