Using a Nest thermostat is one of the easiest ways to improve the day-to-day schedule of your comfort system. This smart thermostat can learn your preferences and automatically make improvements. But as you can expect, it won’t work well or at all if you see an error code appear. The exact error code provides useful information about the root of the problem, something a knowledgeable technician can use to offer solutions that much quicker.

Listed below are seven of the most common error codes you could discover on your Nest thermostat. We’ll walk you through the basics of each error code as well as how you could address it and the estimated cost to do so. Don’t forget that while the costs will ultimately depend on the precise Nest model, you can expect to pay between $75-$200 for repairs. This should also cover travel and labor costs on top of any specific parts required 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 disconnected from the system. Because 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 numerous reasons. The wiring might have disconnected or become damaged, or a disconnection might have appeared further along in your home’s electrical system. This could be the circuit breaker, fuse box or system switch. A knowledgeable technician should check electrical connections and wiring until they find the source 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 conduct a factory reset of your thermostat to make sure it’s not just a software issue. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start inspecting connectors.

They’ll disconnect the power and progressively look at each wire, ensuring they are fully attached into the connector with the proper amount of uncovered copper. Once they pinpoint the problem connector, it can be replaced for a new one.

e195 – Critical

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

Since this error can deplete your thermostat’s battery, the first step might be supplying enough power to determine if this specific error code is what you’re facing. You can detach the thermostat from its base and deliver power by using a USB cable. If it displays error code 195, you may continue to visually check components including the wiring as well as your air conditioner’s air filter or drainage system. If you can’t find anything wrong with these components, it will probably be best to contact a pro.

e103 – Critical

Another critical error code, e103 suggests an electrical problem with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is receiving more power than what is safe and normal. This will sometimes stem from the breaker box, an error from the control board or because of a bad connection in the thermostat. A technician will carefully investigate 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 can still keep 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 getting enough power. You can check the Nest’s C connector for the presence of a C wire and adapt the wiring itself if there is. If not, you need a Nest Power Connector.

Due to installation of a Nest Power Connector, you will sometimes notice error code E297 be displayed. 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 stemming from an overcurrent. If excess power is transported using the Nest’s wiring, it may damage internal components and could even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to take steps to prevent electrical damage, it’s a good idea to turn the power off straightaway. You can then get a hold of a professional technician with the proper experience identifying and resolving electrical problems.

e73 – Critical

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

This may be as straightforward as the breaker being switched off, but it can 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 best to get in touch with a local professional.