Your thermostat has a green blinking light if a green blinking light suddenly appears it just means that your nest is automatically updating its software. As model 3 approaches a full charge the frequency of the blinking slows.
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Nest blinking green light while charging. Depending on the model you have it will be either mini or micro usb. Sometimes the software might be updating or the device is restarting. Realign the connector to the charge port and insert fully. If it takes much longer time check to make sure the display is correctly connected to the thermostat base. After around 10 minutes of charging unplug the nest thermostat from the usb cord. If you witness green blinking light there are different reasons.
If the unit has turned on while charging shut it down and then turn it back on again manually restarting the system. Charging is in progress. Model 3 is charging at a reduced current ac charging. Battery is too low to start. Disconnect the nest from the usb cable and hold down the nest ring for about 10 seconds or until the display goes black. But if this continues for longer than a few minutes see the article below for more troubleshooting.
Do not use a. Typically this will only last a minute or two. A blinking green light near the top of your nest thermostats display means that its updating the software starting up or restarting. A blinking green light will appear if the nest is turning on restarting or updating. Once it has fully restarted plug it back in to finish charging. Press the nest ring again to turn back on the device and release.
In this case you have to change the cable that you are using. Never try to restart the nest while its connected to a computer or power source while charging. It should automatically turn on when finished. If the lights continue to blink for more than 5 minutes remove and reconnect the display. You should now see the nest animation as it starts back up. The connector is not fully plugged in.
If the light is still blinking after reconnecting the device restart it by holding down the thermostat ring for 10 seconds. A small flashing green light on the nest thermostat display usually means that its updating software. This situation arises when the thermostat experiences low charge even if its connected to the plug point. During this process the display will restart which usually only takes 1 2 minutes. Why is there a flashing green light on the nest display. Pull off the nest display and use the usb port on the back to charge it with a usb cable and wall charger.