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If you’ve successfully installed your Nest thermostat, but a blinking red light appears after you’ve been using it regularly for some time, there may be a problem with the thermostat wiring or another power issue. For instance, the blinking red light may show up then go away on itsown repeatedly.
Nest Learning Thermostat 3rd Gen - Black - Smart Google Nest Learning Thermostat 3rd Gen - Black - Smart
If the light blinks green and your thermostat is unresponsive for more than 15 minutes, it may have frozen during the update.
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
Nest Thermostat E
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 Important: Turn off power to your system at the system switch or fuse box. This helps protect your system and thermostat from possible damage. A blinking green light near the top of your Nest thermostat’s display means that it’s updating the software, starting up, or restarting. Typically, this will only last a minute or two. Once your thermostat has finished starting up, it'll turn on so you can use it.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. 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). In most homes, installing a Google Nest thermostat is an easy DIY project that takes about 20-30 min. The Nest app’s step-by-step instructions make it easy to install and wire your thermostat, so use it as your main guide. Refer to this article if you need extra help.