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.

Nest thermostat - Google Nest Help Install your Nest thermostat - Google Nest Help

If you have a Nest thermostat model that uses AAA alkaline batteries, replace them with a fresh set of the same batteries.Nest Thermostat sales regularly shave cash off these pricey smart home accessories. That's perfect if you're kitting out your abode from scratch, but also great if you're replacing an older system and don't want to break the bank. Not only do we often see straight discounts on these devices, but bundle offers are also common. You can save on multiple units simultaneously or with an extra smart home kit on top. You need to know where to look. That's why we're bringing you all the best Nest Thermostat sales live right now - on the highest-value models, no less. Reinsert the wire. The connector button should stay down. If it’s not, the wire isn’t fully inserted. Repeat the above steps with each wire. 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’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 If your thermostat stays blank after you’ve just set it up, you might need to re-insert the wires into the connectors.

GOOGLE Nest Learning Thermostat - 3rd Generation, Black - Currys

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. 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

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.

Nest Thermostats | Central Heating Controls | Screwfix Nest Thermostats | Central Heating Controls | Screwfix

Pull your thermostat off its base and remove both batteries. Make sure that nothing is between the battery and the battery terminals. Put the other end of the USB cable in a charger and plug it into a power outlet. Avoid using a computer to charge your Nest thermostat.

You can continue to install or use your Nest thermostat, but if you haven't fixed the underlying problem then your thermostat will lose power again. Continue with the steps below if that happens. Your thermostat should automatically turn on once it’s connected to your system and your system is powered up. 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. 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.

Nest Learning Thermostat - 3rd Generation, Silver - Currys GOOGLE Nest Learning Thermostat - 3rd Generation, Silver - Currys

The app will show you how to install your thermostat. It will ask you some questions about your thermostat wires. Answer them as accurately as possible. 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 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 Proprietary Heating System: If your HVAC system only has 2 wires when you have both heating and cooling systems, your heating system is most likely proprietary. However, if the old thermostat works perfectly with your system, your Nest thermostat might be seriously damaged.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 suspect that the Nest thermostat isn’t working because you aren’t installing it correctly, consult an installation expert. If your Nest Thermostat won’t turn on, the batteries could have drained or there could be a power issue.