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Install a Nest Power Connector if there aren’t any spare thermostat wires.Connect a C wire if you have an unused thermostat wire.Always make sure to turn the power to your HVAC system off at the breaker before attempting any fixes or installations. If you’re comfortable troubleshooting your system and take necessary precautions, you might be able to fix C wire issues yourself.If needed, they can also connect a C wire or a C wire accessory, such as a Nest Power Connector to your Nest thermostat. They can diagnose and help fix any possible problems with your system and thermostat installation. If you’re not sure what’s wrong or don’t feel comfortable fixing your system, the best solution for power issues is to contact a Nest Pro in your area.If you find a help code, follow the troubleshooting steps in Troubleshoot Nest thermostat help codes. On your thermostat, check for codes that can help you understand what's wrong.Go to the section below for help fixing these power related issues.

You get an E1, E297, N260 or N261 error code.

The system fan turns on and off repeatedly in a short period.

The system fan is always running or won’t turn on.

A “Delayed” or “Starts in” message often appears on your Nest thermostat’s screen (for example: “Heating is delayed for 2:30 mins”).

Heating or cooling repeatedly turns on and off in a short period.

Heating or cooling is always on, and won’t turn off.

Your system is making strange noises: chattering, stuttering, clicking or thumping.

Your system unexpectedly turns on or off.

Your thermostat occasionally disconnects from Wi-Fi.If your system can’t deliver consistent power to your thermostat to keep its battery charged or correctly control heating and cooling, you may experience one or more of these symptoms: In some cases, you may experience problems after installing your Nest thermostat that can be fixed by connecting a Nest Power Connector or a C wire.