In rare cases, a Nest thermostat can be damaged by issues such as a power surge from your system, connecting it to an incompatible system, or by touching exposed wires together if power to the system hasn’t been turned off during installation. If there’s a power issue, your thermostat’s battery will drain and it'll turn off Wi-Fi, the display, and other features to preserve battery life. Before you begin After charging your Nest thermostat with a USB cable, you can start using it. However, you may need to call a technician to fix the charging problem in your thermostat. Read more about Nest thermostat charging issues. If you have a Nest thermostat model that uses AAA alkaline batteries, replace them with a fresh set of the same batteries.

If your system works with your old thermostat, try getting a professional to installyour Nest thermostat.Make an appointment with our installation partner OnTech, to have a trained pro come to your home, install and set up your Nest products.If your Nest thermostat is damaged, or if you need a professional to service your system, the installer maylet you know. If this fix doesn’t help with the blank screen problem, continue to the next step. Fix the Thermostat Display onto the Base Properly If your Nest thermostat screen remains blank after trying other fixes above, there might be a blown fuse in your HVAC system. You can ask a professional installer to fix this issue for you. The installation expert will inspect your thermostat’s wiring and HVAC system and repair any faults. Try Using Your Old Thermostat

Pull one wire out of the base connectors and inspect it for any crookedness or corrosion. The wire should be clean and straight. In addition, the wire must be 1cm long. If your thermostat wires are crooked or rusty, cut and re-strip them. Switch off your HVAC system at the fuse box. If the HVAC system uses a switch, you should also turn that off. This will prevent your thermostat and HVAC system from getting damaged as you re-insert the thermostat wires. If there'sa Wiring Report or other help message on your thermostat or in the app, follow the troubleshooting steps in Troubleshoot Nest thermostat help codes. If you don’t want to hire an installation expert to set up your Nest thermostat for you, you can call the Google Nest support team. They’ll walk you through the installation process and ensure that you set up the thermostat properly. Closing Thoughts

If your Google Nest thermostat won’t turn on and there'sa blinking red or green light, or no light at all, there could be a power issue or your thermostat may have frozen during a software update. Follow the troubleshooting steps below that match the issue you're seeing. Before you begin But for Nest Thermostat E and Nest Learning Thermostat, the batteries are built-in, and they charge automatically via your HVAC system. But for some reason, your Nest thermostat might fail to charge automatically, and this may keep the thermostat screen blank. So, you’ll have to charge the thermostat with a USB cable. Your thermostat should automatically turn on once it’s connected to your system, and your system is powered up or if you put in new batteries. Now return to your thermostat to see if the problem is resolved. If not, keep reading. Confirm that Thermostat is Compatible with Your Heating System You can hire a professional installer and ask them to set up your Nest thermostat for you. The professional installer will tell you if the thermostat is faulty or needs servicing. Reach out to the Google Nest Support TeamIf your thermostat stays blank after you’ve just set it up, you might need to re-insert the wires into the connectors. If there'sa help message on your thermostat or in the app, follow the troubleshooting steps in Troubleshooting Nest thermostat error codes. As long as the thermostat base is from the same model, generation, and country/region as the thermostat display, you can swap bases and displays. If your Nest Thermostat won’t turn on, the batteries could have drained or there could be a power issue.