Operating a Nest thermostat is one of the most convenient ways to improve the everyday schedule of your comfort system. This smart thermostat can learn your preferences and automatically make adjustments. But as you might expect, it won’t work properly or at all if you see an error code appear. The precise error code provides useful information about the root of the problem, something a knowledgeable technician can use to offer solutions that much quicker.
Here 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 along with how you could address it and the approximate cost to do so. Don’t forget that while the investment will ultimately hinge on the exact Nest model, you can count on paying between $75-$200 for repairs. This should include travel and labor costs on top of any specific hardware needed to finish repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and appears when the power is disconnected from the system. Because this is a critical power error, the thermostat will swap to the backup battery system. The error message will remain on the screen until the issue is dealt with.
Losing power to your Nest thermostat can be for several reasons. The wiring may have disconnected or become damaged, or a disconnection could have happened further along in your home’s electrical system. This could be the circuit breaker, fuse box or system switch. A certified technician should examine 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 should be reconfigured. More specifically, you’ll need the technician to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not merely a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start checking connectors.
They’ll shut off the power and slowly check each wire, seeing to it that they are fully placed into the connector with the proper amount of bare copper. After they pinpoint the damaged connector, it can be exchanged 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 giving power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will subsequently shut down. Assuming the breakers are on, you can inspect a handful of other places before contacting a professional technician.
As this error can drain your thermostat’s battery, the first step may be supplying enough power to find out if this specific error code is what you’re working with. You can disconnect the thermostat from its base and deliver power by using a USB cable. If it reveals error code 195, you should continue to visually examine components such as 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 will likely be best to contact a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical issue with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is experiencing more power than necessary. This may stem from the breaker box, an error from the control board or thanks to a defective connection in the thermostat. The technician will 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
While this error code isn’t critical, it can still keep you from using the Nest thermostat how you want to. Error code n260 refers to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from obtaining enough power. You can inspect the Nest’s C connector for the presence of a C wire and adapt the wiring itself if there is. If not, you can get a Nest Power Connector.
Due to installation of a Nest Power Connector, you may notice error code E297 show up. This can be resolved 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
Like error code e103, e104 is a critical error originating from an overcurrent. If excessive power is transported through the Nest’s wiring, it can damage internal components and can even be a fire hazard. If you notice this error code show up on your Nest thermostat and want to guard against electrical damage, it’s recommended to turn the power off as soon as you can. You can then get in touch with a professional technician with the necessary experience identifying and fixing electrical problems.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not getting power.
This might be as simple as the breaker being shut off, but it could also be an issue with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually examine the wires to make sure none of them are loose or damaged. If nothing looks to be out of place, it’s time to contact a local professional.