Installing a Nest thermostat is one of the most convenient ways to optimize the everyday schedule of your HVAC system. This smart thermostat can learn your preferences and automatically make improvements. But as you may expect, it won’t work well or at all if you see an error code show up. The specific error code offers useful information about the underlying problem, something a knowledgeable technician can use to offer solutions that much sooner.
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 along with how you could fix it and the projected cost to do so. Remember that while the price will ultimately be dependent on the precise Nest model, you can expect to pay between $75-$200 for repairs. This should also cover travel and labor costs along with any specific parts needed 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 detached from the system. Because this is a critical power error, the thermostat will change to the backup battery system. The error message will continue to be displayed until the problem is fixed.
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 will check electrical connections and wiring until they uncover the root of the problem.
e294 – Critical
Critical error code e294 is displayed when your Nest thermostat’s wiring has to 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 make sure it’s not merely a software error. If that doesn’t work, they’ll check the wiring diagram of the thermostat and start checking connectors.
They’ll shut off the power and slowly inspect each wire, making sure they are fully inserted into the connector with the proper amount of exposed copper. After they locate the malfunctioning connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can appear when the weather outside is particularly hot. The HVAC system can fail and stop sending power to your Nest thermostat. When this problem persists, the backup battery in your thermostat drains and the thermostat will finally turn off. In the event the breakers are on, you can search a few other places before contacting a professional technician.
Since this error can consume your thermostat’s battery, the first step could be providing enough power to figure out 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 displays error code 195, you can 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 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 getting more power than needed. This can stem from the breaker box, an error from the control board or through a defective connection in the thermostat. The technician can meticulously examine and test the Nest’s electrical system to understand where the power is surging or why the thermostat thinks there’s an overcurrent problem.
n260
While this error code isn’t critical, it might still prevent you from using the Nest thermostat how you prefer to. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from receiving 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.
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 be required 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 sent inside the Nest’s wiring, it may damage internal components and could even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to guard against electrical damage, it’s recommended to switch the power off straightaway. You can then get in touch with 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 getting power.
This will sometimes be as simple as the breaker being turned off, but it can 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 nothing is loose or damaged. If nothing seems to be out of place, it’s a good idea to get in touch with a local professional.