Using a Nest thermostat is one of the most convenient ways to perfect the daily schedule of your HVAC system. This smart thermostat can be taught your preferences and automatically make improvements. But as you might expect, it won’t work correctly or at all if you see an error code show up. The precise error code provides useful information about the root of the problem, something a knowledgeable technician can use to provide solutions that much quicker.
Let’s consider seven of the most likely error codes you may discover on your Nest thermostat. We’ll walk you through the basics of each error code as well as how you can address it and the estimated cost to do so. Keep in mind that while the costs will ultimately hinge on the precise Nest model, you can count on paying between $75-$200 for repairs. This should also cover travel and labor costs on top of any specific parts required to complete 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 change to the backup battery system. The error message will remain on display until the issue is resolved.
Losing power to your Nest thermostat can be for a number of reasons. The wiring might have disconnected or become damaged, or a disconnection could have happened further along in the electrical system. This might be the circuit breaker, fuse box or system switch. A professional technician can inspect electrical connections and wiring until they uncover the source of the problem.
e294 – Critical
Critical error code e294 is displayed when your Nest thermostat’s wiring needs to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to make sure it’s not just a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin checking connectors.
They’ll shut off the power and slowly check each wire, ensuring they are fully attached into the connector with the correct amount of exposed copper. When they pinpoint the malfunctioning connector, it can be swapped for a new one.
e195 – Critical
This critical error code can appear 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 depletes and the thermostat will subsequently shut down. In the event the breakers are on, you can check a handful of other places before contacting a professional technician.
Because this error can deplete your thermostat’s battery, the first step could be providing enough power to figure out if this specific error code is what you’re facing. You can detach the thermostat from its base and provide power through a USB cable. In the event it presents error code 195, you should continue to visually check components such as 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’s maybe best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical issue with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is receiving more power than what is safe and normal. This may stem from the breaker box, an error from the control board or through a bad connection in the thermostat. A technician should carefully inspect and test the Nest’s electrical system to understand where the power is surging or why the thermostat believes there’s an overcurrent problem.
n260
Although this error code isn’t critical, it might still keep you from using the Nest thermostat how you want to. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from getting adequate power. You can check the Nest’s C connector for the presence of a C wire and modify 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 show up. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector was already 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 transported inside the Nest’s wiring, it could damage internal components and may even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to guard against electrical damage, it’s suggested to switch the power off straightaway. You can then contact a professional technician with the necessary experience identifying and solving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This could be as easy as the breaker being shut 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 nothing is loose or damaged. If nothing looks to be out of place, it’s best to get in touch with a local professional.
