But if this continues for longer than a few minutes see the article below for more troubleshooting. The thermostats display wont light up and unresponsive you may also observe a blinking red or green light above the display the thermostat cant control the corresponding heating and cooling units.

Fix Nest Hello Power Problems Youtube
Nest green blinking light. Nest camera blinking blue. Typically this will only last a minute or two. Green light has always been used to indicate that everything is good and the same is with the nest camera blinking green. It should automatically turn on when finished. A blinking green light will appear if the nest is turning on restarting or updating. During this process the display will restart which usually only takes 1 2 minutes.
A blinking green light near the top of your nest thermostats display means that its updating the software starting up or restarting. Battery is too low to start. If your nest camera is blinking green then you should know that your nest cam is working properly and is connected to the internet and you can watch the live video feed. If it takes much longer time check to make sure the display is correctly connected to the thermostat base. 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. 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. When this happens your nest thermostat cant draw power from your system to charge its battery. It should automatically turn on when finished. If the lights continue to blink for more than 5 minutes remove and reconnect the display. You may also see a furnace heads up message on the thermostat screen in your nest app messages or.