Here's What These 7 Nest Thermostat Error Codes Mean

Operating a Nest thermostat is one of the easiest ways to improve the everyday schedule of your HVAC system. This smart thermostat can learn your preferences and automatically make adjustments. But as you might expect, it won’t work well or at all if you see an error code on the display. The specific error code offers useful information about the source of the problem, something a trained technician can use to provide solutions that much quicker.

Let’s consider seven of the most common error codes you might encounter on your Nest thermostat. We’ll walk you through the basics of each error code as well as how you could fix it and the projected cost to do so. Remember that while the costs will ultimately be dependent on the specific Nest model, you can count on paying between $75-$200 for repairs. This should also cover travel and labor costs as well as any specific parts necessary to finish repairs.

e298 – Critical

This critical error code is limited to new models of the Nest thermostat and shows up when the power is shut off. As this is a critical power error, the thermostat will change to the backup battery system. The error message will remain on display until the problem is dealt with.

Losing power to your Nest thermostat can be for a number of reasons. The wiring might have disconnected or become damaged, or a disconnection may have occurred further along in your home’s electrical system. This could be the circuit breaker, fuse box or system switch. A trained technician can inspect electrical connections and wiring until they locate the source of the problem.

e294 – Critical

Critical error code e294 is displayed when your Nest thermostat’s wiring should be reconfigured. More specifically, the technician will need 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 examine the wiring diagram of the thermostat and begin looking at connectors.

They’ll disconnect the power and slowly check each wire, making sure they are fully inserted into the connector with the correct amount of exposed copper. After they find the problem connector, it can be swapped for a new one.

e195 – Critical

This critical error code can show up when the weather outside is especially hot. The HVAC system can fail and stop delivering power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat depletes and the thermostat will subsequently shut down. Presuming the breakers are on, you can inspect a handful of other places before contacting a professional technician.

As this error can consume your thermostat’s battery, the first step might be restoring enough power to find out if this specific error code is what you’re dealing with. You can detach the thermostat from its base and deliver power through a USB cable. Assuming it displays error code 195, you should continue to visually examine components like the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to uncover anything wrong with these components, it will likely be best to contact a pro.

e103 – Critical

Another critical error code, e103 suggests an electrical problem with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is receiving more power than what is safe and normal. This can stem from the breaker box, an error from the control board or because of a faulty connection in the thermostat. Your technician can cautiously examine 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

Even though this error code isn’t critical, it might still stop you from using the Nest thermostat how you prefer to. Error code n260 concerns the lack of a C wire or Nest Power Connector, as not having one can block your Nest from receiving sufficient power. You can examine the Nest’s C connector for the presence of a C wire and modify the wiring itself if there is. If not, you can get a Nest Power Connector.

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

e104 – Critical

Similar to error code e103, e104 is a critical error that’s the result of an overcurrent. If excess power is transported through the Nest’s wiring, it can damage internal components and could even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s a good idea to turn the power off as soon as you can. You can then get in touch with a professional technician with the proper experience diagnosing and resolving electrical damage.

e73 – Critical

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

This might be as easy as the breaker being shut off, but it can also be an issue with the wiring. After switching off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure none of them are loose or damaged. If nothing seems to be out of place, it’s a good idea to speak with a local professional.