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 When you’ve removed the panel, look for the control board. It looks like a circuit board and usually has lots of wires attached to it. You should findseveral sets of connectors on the control board with wires connected to them. Wires labeled S or S1 can be indicator lights or sensor wires. The Nest thermostat uses its LCD display instead of an indicator light and gets sensor information, like outdoor weather conditions, over Wi-Fi. The Y2 wire controls the second stage of cooling in conventional systems, which can help cool your home faster.

Nest Learning Thermostat 3rd Generation, Stainless Google Nest Learning Thermostat 3rd Generation, Stainless

Systems that use micro-controllers instead of relays are sometimes more sensitive to power sharing. If you have a micro-controller based system, your Nest thermostat may need a C wireor Nest Power Connector to be compatible with these systems. Zone relay or control panelsThe G or G1 wire controls your fan. Your fan pushes the warm or cool air through your vents into the rooms of your home. A thermostat restart can fix some common issues. Reset your thermostat to clear your personal settings.

Google Nest Learning Thermostat, 3rd Generation, White

In some heat pump systems, the W2 wire may control a separate furnace to help heat your home. These types of systems are called dual fuel systems because the heat pump and the furnace use different heat sources.These articles cover the most common issues you may encounter after setting up your Nest thermostat. This is not an extensive list so if you don’t find what you’re looking for below, there are other troubleshooting articles that you can find using the search bar above. Looking at your system’s board is the most certain way to determine what the wire is. Follow the instructions in the next section. 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. Proprietary systems are designed by the manufacturer so that they can’t work with other thermostats. If the Voc, Vin or lin values are not within the specific ranges listed here, there may be a wiring or system issue: