Battery is too low to start. It seems to be stuck in some sort of delay loop of about 10 seconds blinking green light followed by maybe 2 seconds blinking orangered light.

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Nest thermostat e blinking green light. During this process the display will restart which usually only takes 1 2 minutes. It goes through this blinking cycle about three times then stops and doesnt start up again for about 5 minutes. It should automatically turn on when finished. But if this continues for longer than a few minutes see the article below for more troubleshooting. 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 lights continue to blink for more than 5 minutes remove and reconnect the display.
A blinking green light will appear if the nest is turning on restarting or updating. Typically this will only last a minute or two. A small flashing green light on the nest thermostat display usually means that its updating software. It should automatically turn on when finished. If it takes much longer time check to make sure the display is correctly connected to the thermostat base. Nest thermostat e blinking light issue thermostat.
Diy how to renovate the tub shower from a to z duration. A blinking green light near the top of your nest thermostats display means that its updating the software starting up or restarting. If the light is still blinking after reconnecting the device restart it by holding down the thermostat ring for 10 seconds. Nest thermostat blinking green light non responsive fix duration.