Nest sensors “unresponsive to HVAC”

[lmrogers]

I have a Nest thermostat 4th generation that has been struggling to keep the house warm during our latest cold snap. What I notice is that many of my room temp sensors go “offline” or “unresponsive to HVAC” in the app at night or during the coldest days. I do have a c-wire and as far as I can tell the thermostat is adequately powered. Does not lose WiFi but intermittently drops or changes ‘status’ of sensors in the app. I have removed and re-added sensors to no avail. I have charged the thermostat externally with usb-c for short periods and this does not seem to make a difference. The thermostat is a little over 6 months old and I had never had this issue up until about 3 weeks ago.

Appreciate any insight!

Picture of wiring/power/settings on my reddit post:

https://www.reddit.com/r/Nest/comments/1isvu0i/nest_sensors_unresponsive_to_hvac/

[JDS1]

Having the same problem even after adding a Google Nest Connector. Any solves found? 

[lmrogers]

No solution found yet. But I did notice that I only have this problem during a cold snap and now that the temperatures outside are warming I have not had any of my sensors go offline/unresponsive to HVAC in a few weeks

[DeboraJ]

Hi @lmrogers

Thanks for reaching out to the Community! I understand that you were having some inconveniences with your Nest Sensors because they were offline, I know how frustrating could be this situation but don’t worry! Let me help yu with that! 

Before we continue I need to know some details about your case just to provide you with more accurate steps! 

• Did you try any troubleshooting steps?
• Can you see any error messages when your sensors were offline?
• Did you notice any power outages near of your area 

Once you have this information, I will be more than ready to assist you!

Best Regards,

Debora

[lmrogers]

@DeboraJ 

Yes I removed and added them again and this did not help
No additional error messages aside from “offline” or “unresponsive to HVAC”
No power outages