Operating a Nest thermostat is one of the best ways to improve the daily schedule of your comfort system. This smart thermostat can learn your preferences and automatically make adjustments. But as you can expect, it won’t work correctly or at all if you see an error code on the display. The precise error code supplies useful information about the root of the problem, something a trained technician can use to offer solutions that much faster.

Listed below are seven of the most likely error codes you might discover on your Nest thermostat. We’ll walk you through the basics of each error code on top of how you can address it and the projected cost to do so. Don’t forget that while the price will ultimately hinge on the precise 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 hardware required to complete repairs.

e298 – Critical

This critical error code is limited to new models of the Nest thermostat and shows up when the power is disconnected from the system. 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 issue is fixed.

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

e294 – Critical

Critical error code e294 appears when your Nest thermostat’s wiring should 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 shut off 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. When they find the malfunctioning connector, it can be exchanged for a new one.

e195 – Critical

This critical error code can surface 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 finally turn off. Presuming the breakers are on, you can search a few other places before contacting a professional technician.

Since this error can drain your thermostat’s battery, the first step might be providing enough power to figure out if this specific error code is what you’re dealing with. You can detach the thermostat from its base and deliver power by using a USB cable. If it reveals error code 195, you can continue to visually check components like the wiring as well as your air conditioner’s air filter or drainage system. If you can’t detect anything wrong with these components, it’s maybe best to call a pro.

e103 – Critical

Another critical error code, e103 indicates an electrical malfunction 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 bad connection in the thermostat. The technician should cautiously inspect and test the Nest’s electrical system to figure out where the power is surging or why the thermostat is convinced there’s an overcurrent problem.

n260

Although this error code isn’t critical, it could 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 missing one can block your Nest from obtaining sufficient power. You can inspect the Nest’s C connector for the presence of a C wire and adjust the wiring itself if there is. If not, you’ll need a Nest Power Connector.

During installation of a Nest Power Connector, you will sometimes notice error code E297 be displayed. This can be resolved by updating your thermostat in Settings -> Software -> Update. If the Power Connector was already installed, you’ll instead need to update the wiring info in the app from Settings -> Thermostat -> Wiring -> Update wiring.

e104 – Critical

Like error code e103, e104 is a critical error originating from an overcurrent. If too much power is transported inside the Nest’s wiring, it can damage internal components and may even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to protect from electrical damage, it’s suggested to shut the power off as soon as possible. You can then contact a professional technician with the proper experience diagnosing and resolving electrical issues.

e73 – Critical

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

This could be as simple as the breaker being shut off, but it could also be something with the wiring. After turning off the power to your HVAC system and thermostat, you can visually check the wires to make sure none of them are loose or damaged. If nothing appears to be out of place, it’s time to contact a local professional.