If your nest thermostat is off and wont turn on take the thermostat off the base and charge it using a usb cord plugged into a wall charger or a computer. There really is not a way to check the outdoor unit without the thermostat.

Nest Thermostat E
Nest thermostat not turning on. Honeywell wires are as follows. Pull off your nest thermostats display and see if theres a wire in the c connector. Sometimes the wire in your nest thermostats c connector isnt. Nest button doesnt click quite right or the thermostat just wont sit right on the base. There should be a 3 to 5 min delay between turning it on and off. More than likely it is not the thermostat.
If theres already a wire in the c connector. Your thermostat has a green blinking light. Ive since reinstalled the honeywell unit and everything works fine. Orange into ow2 o heat pump w2 ac blue. When you have connected the nest thermostat to the system it should switch on. If your nest thermostat will turn on but you cant control it or its acting sluggish try manually restarting it and turn the thermostat off and then back on again.
A red blinking light means that the nests battery is running low. The install seemed straight forward but the unit didnt turn on. Installed nest thermostat e replacing an older honeywell thermostat. If you witness the red light blinking you should wait until the battery is 100 charged. If you see a blinking red light at the top of your nest thermostats display youll need to wait until the battery is. You can not turn the ac on and off.
Your nest thermostat should automatically turn on once its connected to your system and your system is powered up. How to fix a nest thermostat that wont turn on your thermostat has a red blinking light. If a green blinking light suddenly appears it just means that your nest is. I think there is also a built in delay. During regular use your. But if the outdoor fan comes on when you turn the thermostat to ac.
Before you start troubleshooting. We cover all these problems with the nest 3rd generation thermostat and give you some quick and easy ways. The thermostats might turn off without your consent if you dont use it for some time but then it might turn on once it is accessed through the nest thermostat app.