Check on the nest itself under settingstechnical infopower. To solve this issue you must check the following.
My Nest Thermostat Is Not Charging When It Is On The Base
Nest thermostat won t charge. On your nest learning thermostat press the ring to bring up the main menu. You should see voc vin and lin. It will deplete if the system is off for too long. Connecting a nest thermostat to an incompatible system such as a millivolt proprietary or high voltage system wont deliver the power needed to charge your thermostats battery and can damage. To troubleshoot the problem and eliminate network access and my router as the cause i manually disconnected nest from my network and ran it as a stand alone thermostat. I did note that nest pushed out a software update 305 just before all my problems started but i cannot say definitively that the software update caused my issues.
In rare cases it is used for. The nest appears only to charge when the ac system is running robbing a small amount to charge itself. Turn to settings and press the ring again to select. Learn about the usb port on the back of the nest thermostat. Double check whether the nest display is ideally placed to the based check whether the system gets enough power make sure the system is compatible check the thermostats wiring find whether the fuse in the system blown out look whether the. The usb port on the back on the google nest thermostat can be used to quickly charge the battery.