Operating a Nest thermostat is one of the easiest ways to improve the everyday schedule of your comfort system. This smart thermostat can recognize your preferences and automatically make changes. But as you may expect, it won’t work properly or at all if you see an error code show up. The specific error code offers useful information about the underlying problem, something a knowledgeable technician can use to offer solutions that much quicker.

Listed below are seven of the most common error codes you might find on your Nest thermostat. We’ll review the basics of each error code as well as how you can fix it and the projected cost to do so. Don’t forget that while the price will ultimately depend on the precise Nest model, you can expect to pay around $75-$200 for repairs. This should include travel and labor costs as well as any specific parts needed to finish repairs.

e298 – Critical

This critical error code is limited to the latest models of the Nest thermostat and appears when the power is shut off. As this is a critical power error, the thermostat will switch to the backup battery system. The error message will continue to be displayed until the problem is dealt with.

Losing power to your Nest thermostat can be for a number of reasons. The wiring could have disconnected or become damaged, or a disconnection could have happened further along in the electrical system. This may be the circuit breaker, fuse box or system switch. A certified technician will check electrical connections and wiring until they find the root of the problem.

e294 – Critical

Critical error code e294 appears when your Nest thermostat’s wiring should be reconfigured. More specifically, you’ll need the technician to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not merely a software problem. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start checking connectors.

They’ll detach the power and progressively inspect each wire, seeing to it that they are fully attached into the connector with the proper amount of uncovered copper. Once they find the problem connector, it can be exchanged for a new one.

e195 – Critical

This critical error code can surface when the weather outside is particularly hot. The HVAC system can break down and stop sending power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat drains and the thermostat will subsequently turn off. In the event the breakers are on, you can examine a couple of other places before calling a professional technician.

Because this error can consume your thermostat’s battery, the first step could be supplying enough power to determine if this specific error code is what you’re dealing with. You can separate the thermostat from its base and provide power by using a USB cable. Assuming it reveals error code 195, you should continue to visually examine components including the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to detect anything wrong with these components, it’s maybe best to call a pro.

e103 – Critical

Another critical error code, e103 indicates an electrical error with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is experiencing more power than needed. This will sometimes stem from the breaker box, an error from the control board or through a defective connection in the thermostat. A technician can carefully inspect and test the Nest’s electrical system to determine where the power is surging or why the thermostat thinks there’s an overcurrent problem.

n260

While this error code isn’t critical, it may still prevent you from using the Nest thermostat how you want to. Error code n260 refers to the lack of a C wire or Nest Power Connector, as the absence of one can block your Nest from obtaining enough power. You can inspect the Nest’s C connector for the presence of a C wire and adapt the wiring itself if there is. If not, you can get a Nest Power Connector.

With installation of a Nest Power Connector, you may notice error code E297 show up. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector has already been installed, you’ll instead have to update the wiring info in the app from Settings -> Thermostat -> Wiring -> Update wiring.

e104 – Critical

Just like error code e103, e104 is a critical error originating from an overcurrent. If excess power is sent using the Nest’s wiring, it could damage internal components and could even be a fire hazard. If you see this error code appear on your Nest thermostat and want to guard against electrical damage, it’s a good idea to turn the power off straightaway. You can then contact a professional technician with the proper experience identifying and resolving electrical malfunctions.

e73 – Critical

When your thermostat displays error code e73, it indicates that the Rc wire is not getting power.

This may be as easy as the breaker being switched off, but it could also be an issue with the wiring. After switching off the power to your HVAC system and thermostat, you can visually examine the wires to make sure they’re not loose or damaged. If nothing looks to be out of place, it’s time to speak with a local professional.