Operating a Nest thermostat is one of the easiest ways to optimize the day-to-day schedule of your HVAC system. This smart thermostat can recognize your preferences and automatically make improvements. But as you may expect, it won’t work properly or at all if you see an error code show up. The exact error code provides useful information about the source of the problem, something a knowledgeable technician can use to provide solutions that much sooner.
Let’s consider seven of the most common error codes you may find on your Nest thermostat. We’ll review the basics of each error code along with how you can fix it and the approximate cost to do so. Keep in mind that while the costs will ultimately hinge on the specific Nest model, you can count on paying around $75-$200 for repairs. This should include things like travel and labor costs as well as any specific parts needed to finish repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and is displayed when the power is shut off. 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 fixed.
Losing power to your Nest thermostat can be for several reasons. The wiring may have disconnected or become damaged, or a disconnection may have happened further along in the electrical system. This may be the circuit breaker, fuse box or system switch. A trained technician will 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 should be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not simply a software error. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start checking connectors.
They’ll detach the power and gradually look at each wire, seeing to it that they are fully inserted into the connector with the proper amount of uncovered copper. Once they locate 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 break down and stop delivering power to your Nest thermostat. When this problem persists, the backup battery in your thermostat depletes and the thermostat will finally turn off. In the event the breakers are on, you can check a few other places before calling a professional technician.
Since this error can deplete your thermostat’s battery, the first step may be restoring enough power to find out if this specific error code is what you’re dealing with. You can detach the thermostat from its base and deliver power with a USB cable. If it displays error code 195, you may continue to visually examine components including the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to find anything wrong with these components, it will likely be best to call a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical issue with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is experiencing more power than needed. This can stem from the breaker box, an error from the control board or because of a bad connection in the thermostat. Your technician can meticulously inspect and test the Nest’s electrical system to understand where the power is surging or why the thermostat is convinced there’s an overcurrent problem.
n260
While this error code isn’t critical, it can still prevent 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 sufficient power. You can examine 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.
With installation of a Nest Power Connector, you may 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 need 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 originating from an overcurrent. If excessive power is sent through the Nest’s wiring, it could 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 switch the power off as soon as possible. You can then contact 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 might be as easy as the breaker being shut off, but it may also be something with the wiring. After turning 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 a good idea to contact a local professional.