Y3 wires indicate a system that has three stages of cooling. The Nest thermostat does not support three stages of cooling. Is useful if you’re moving out and need to install your thermostat in a new location, or want to leave your thermostat behind and remove all of your personal information.

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The common (C) wire doesn’t control heating or cooling. Instead, C wires help deliver power from the system to the thermostat in case the other wires can’t provide enough power. Not all systems have a C wire installed, but Nest thermostats were engineered to use as little power as possible for their display and internal circuitry.So in many cases, they don’t need a C wire. Your Nest thermostat has a few different features that can help keep you comfortable. For instance, True Radiant pre-heats to reach your scheduled temperature on time. You can also set Safety Temperatures, which prevents your home from going below certain temperatures, and learn about the other ways your thermostat works. Here are the most important articles to familiarize yourself and get you comfortable with using your thermostat: Systemsthat use coal, wood chips, pellets, anthracite, or other biomass materials are typically incompatible with Nest thermostats.

After your thermostat has been set up and connected to Wi-Fi, you can add it to your account in the Nest app to start using your phone to control your thermostat, get monthly updates on your energy use and more. In some cases, the app will let you proceed with wiring your Nest thermostat even if you have one or more of the wires listed below. But it will exclude some or all of these wires from the wiring diagram because certain features aren't supported. Don’t try to connect wires that are excluded from the app wiring diagram. Unsupported wires that are installed incorrectly can damage your thermostat or your system. Wire label The Y2 wire controls the second stage of cooling in conventional systems, which can help cool your home faster. Tip: If you're moving and leaving your thermostat behind and want to use this option, you might also want to reset the temperature schedule as well. This will let the new owners control the system from day one while the thermostat learns a schedule for them. Some gas valves on systems vibrate or buzz when a Nest thermostat is installed. This can usually be fixed by connecting a C wire. Zone relay or control panels

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If you put wires into the wrong thermostat connectors during setup can, this cancause your system to malfunction or possibly damage it.Simply enter which connectors have a wire and ignore the color of the wires. This is because not all systems are connected to the thermostat with the same wire colors. Tip:Common wires are typically blue, but you should not rely on color alone to determine the function of a wire. There are several ways to identify your thermostat wires: Take a picture of your current thermostat’s wiring Some dehumidifiers use two wires to turn on or off. Only one dehumidifier wire can be connected to your Nest thermostat. Your Nest Pro can determine how to install your dehumidifier.