e79 error after power interruption

[jzee]

Hi, I own 3 Nest thermostats and all have been working well.  This morning we had 2 brief power interruptions and 2 of the 3 Nests are doing their jobs again.  One Nest is showing an error E70 Wiring report; no power to common (C) detected.  I can't get to the settings screen to try a reset.  I can scroll through the screens and see that equipment is detected at both the C and Rh wire connectors (wires inserted at w1,Y1,C,Rh and G) and equipment sensed on w1.y1,G and Rh).   Can you advise how to resolve this issue?   

[jzee]

I'm posting an update based on some things I read on this site.  I did check my breaker to my HVAC unit and it was all good- never tripped.  Then I pulled the cover off my Nest and double checked all the wiring connections.  The display verified they were all connected despite a message that there was no power to C wire.  That all looked good but I wiggled all the wires anyway and then when I put the cover back on the Nest- voila, it was working again!  I also want to report that, a few months back,  one of my Nest's was not able to connect to my WiFi, despite all efforts, and I called Google support and they sent me a new one.  So I believe that if all else fails, call support, it worked for me.

[MelbaDT]

Hi, 

I haven't heard from you in a while so I'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

[MelbaDT]

Hey jzee, 

Thanks for posting and for keeping us in the loop of what you've done to resolve your concern. I'm glad to hear that you've managed to have your Nest thermostat back up and running as it should. 

Do not hesitate to reach out should you need us again in the future — we're just here. 

Cheers. 

Melba