Some thermostats require battery power and if the battery dies your screen will go blank. The nest learning thermostat screen will turn from orange when heating to black when.

Nest Thermostat Troubleshooting Nest Won T Turn On
Nest thermostat black screen. Pull the silver ring of your thermostat gently away from the wall. I put in a support ticket and nest have kindly sent a new one. If all your nest thermostat displays is a black screen and wont turn on try the steps below to troubleshoot the problem. Nest thermostat black screen. Nest thermostat screen has suddenly gone black. When this happens your nest thermostat cant draw power from your system to charge its battery.
Clean the battery contacts with a pencil eraser and gently pry out the spring contact so you get the best connection. My wife and daughter are starting to be very hot and i would like to support them. You may also see a furnace heads up message on the thermostat screen in your nest app messages or in your monthly home report email. Check the c terminal of the base to see if your nest thermostat. The color will change depending on your systems current state. We have two nest devices the learning one is controlling the ac.
Try changing the batteries. Smart thermostats like the nest use the wires connecting the heating and cooling system to recharge. I am currently in miami for a conference its very hot back in new jersey and of course this si when the thermostat is not working anymore. Still works but cant see any info on the screen. The nest thermostat should pop off the base. For example a clogged air filter can cause your system to overheat and automatically shut off.
You may also see a message like heat set to.