Using a Nest thermostat is one of the easiest ways to perfect the everyday schedule of your heating and cooling. This smart thermostat can recognize your preferences and automatically make changes. But as you may expect, it won’t work well or at all if you see an error code show up. The precise error code provides useful information about the source of the problem, something a trained technician can use to present solutions that much quicker.

Listed below are seven of the most likely error codes you could find on your Nest thermostat. We’ll review the basics of each error code as well as how you might fix it and the projected cost to do so. Don’t forget that while the investment will ultimately depend on the specific Nest model, you can anticipate paying between $75-$200 for repairs. This should include things like travel and labor costs as well as any specific components necessary to wrap up repairs.

e298 – Critical

This critical error code is limited to new models of the Nest thermostat and appears when the power is disconnected from the system. As this is a critical power error, the thermostat will swap to the backup battery system. The error message will continue to be displayed until the issue is dealt with.

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

e294 – Critical

Critical error code e294 appears when your Nest thermostat’s wiring needs to be reconfigured. More specifically, the technician will need to reconfigure the R wire. They’ll first perform 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 start inspecting connectors.

They’ll disconnect the power and gradually look at each wire, making sure they are fully attached into the connector with the proper amount of bare copper. Once they pinpoint the damaged connector, it can be swapped for a new one.

e195 – Critical

This critical error code can show up when the weather outside is particularly hot. The HVAC system can shut down and stop sending power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat drains and the thermostat will finally power down. Presuming the breakers are on, you can inspect a handful of other places before consulting a professional technician.

Because this error can consume your thermostat’s battery, the first step may be restoring enough power to determine if this specific error code is what you’re working with. You can detach the thermostat from its base and supply power with a USB cable. If it presents error code 195, you may continue to visually inspect components such as the wiring as well as your air conditioner’s air filter or drainage system. If you don’t uncover anything wrong with these components, it’s maybe best to call a pro.

e103 – Critical

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

n260

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

During installation of a Nest Power Connector, you might notice error code E297 appear. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead have 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 stemming from an overcurrent. If excess power is sent inside the Nest’s wiring, it could damage internal components and can even be a fire hazard. If you see this error code show up on your Nest thermostat and want to protect from electrical damage, it’s a good idea to switch the power off straightaway. You can then get in touch with a professional technician with the proper experience diagnosing and fixing electrical problems.

e73 – Critical

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

This might be as simple as the breaker being shut off, but it can also be an issue with the wiring. After turning 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 appears to be out of place, it’s best to contact a local professional.