Your thermostat should automatically turn on once it’s connected to your system and your system is powered up. Insert the two new AAA alkaline batteries. Be sure to match the positive "+" and negative "-" ends of the batteries with the markings in the battery compartment.

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. If your thermostat shows you a blinking red light, the battery is charging and it'll eventually turn on. It can take up to an hour if the battery is extremely low. Of course, Nest isn't the only manufacturer of smart thermostats, although it is our favorite (as indicated by its #1 spot on our Best Smart Thermostats list). If your Nest thermostat screen fails to turn on when you just finished setting it up, you may not have connected your thermostat wires correctly. Your Nest thermostat wires need to be properly inserted into the base connectors for the device to function effectively.If you suspect that the Nest thermostat isn’t working because you aren’t installing it correctly, consult an installation expert. 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 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 you have a Nest thermostat model that uses AAA alkaline batteries, replace them with a fresh set of the same batteries.

Millivolt Heating Systems: A millivolt heating system can be a wall-mounted or floor-mounted heater that is powered by natural gas or electricity. Even when a millivolt system uses electricity, it still provides less power than the required amount for the Nest thermostat.

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However, if the old thermostat works perfectly with your system, your Nest thermostat might be seriously damaged. The exposed part of the wire should be clean, straight, and 3/8” (1 cm) long. Cut and re-strip any crooked or corroded wire ends. 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. You should fix any issues with your system or thermostat, but as a temporary measure, you can charge your Nest thermostat with a USB cable. 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.

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 Team Touch bar on the right side of the ring: also comes in different colors (Refer to the colors below). Note:If you still have it, use the picture of the wires in your old thermostat that you were instructed to take during thermostat installation. If you discover that your heating system is millivolt, proprietary, or high voltage, you might need to replace your Nest thermostat with a compatible alternative. That said, an installation expert can help you rewire your proprietary heating system to make it compatible with the Nest thermostat. Re-insert Your Thermostat’s Wires Appropriately The 3rd genNest Learning Thermostat’s stainless steel ring can also be in different colors. If you have a thermostat ring that looks likeone of these, you have a 3rd gen Nest LearningThermostat.

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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.