You can contact them here. In some cases this may cause the device to respond.

Nest Thermostat Glitch Leaves Users In The Cold The New
Nest battery not charging. There are a few ways to charge the nest thermostat but its important to check a few things before charging your nest because durring normal use the nest thermostat does not need to be charged. The nest thermostat when working properly should automatically charge from the power provided by your hvac equipment. The nest appears only to charge when the ac system is running robbing a small amount to charge itself. Not sure if the root cause is a battery issue or software update issue since it worked fine for months before. The charge level is listed in the battery area and should be 36 volts or higher. It will deplete if the system is off for too long.
Press the ring to bring up the quick view menu. Turn the ring to settings and press to select. You can monitor the battery charge status by heading to settings technical info and scrolling the nest to to power. If the nest battery continues to drain itself you will have to contact the nest technical support department for further assistance. If your nest disconnects itself from wifi check your battery levels. To solve this issue you must check the following.
For those nests that are connected the battery simply serves as a backup power source. How to charge nest thermostat. The nest has a rechargeable battery that gets its charge through your heating or cooling system. Nest has admitted that people are having problems with its batteries. Check on the nest itself under settingstechnical infopower. 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.
We are aware of a low battery issue impacting some nest thermostat owners. If the nest falls below this number it will shut back off. Nest thermostat battery charging problem and solution. My nest generation 1 had been working flawlessly for several months both summer and winter heating and cooling until about january 23rd 2013 or so.