Operating a Nest thermostat is one of the most convenient ways to perfect the everyday schedule of your heating and cooling. This smart thermostat can learn your preferences and automatically make changes. But as you may expect, it won’t work well or at all if you see an error code on the display. The precise error code supplies useful information about the source of the problem, something a knowledgeable technician can use to provide solutions that much quicker.
Here are seven of the most frequent error codes you may encounter on your Nest thermostat. We’ll review the basics of each error code along with how you might fix it and the projected cost to do so. Remember that while the costs will ultimately hinge on the precise Nest model, you can count on paying about $75-$200 for repairs. This should also cover travel and labor costs along with any specific components necessary to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and appears when the power is shut off. Since this is a critical power error, the thermostat will switch 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 numerous reasons. The wiring might have disconnected or become damaged, or a disconnection may have happened further along in the electrical system. This might be the circuit breaker, fuse box or system switch. A trained technician should inspect electrical connections and wiring until they find the root of the problem.
e294 – Critical
Critical error code e294 shows up when your Nest thermostat’s wiring has to be reconfigured. More specifically, the technician will need to reconfigure the R wire. They’ll first perform a factory reset of your thermostat to make sure it’s not merely a software issue. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin looking at connectors.
They’ll detach the power and progressively look at each wire, ensuring they are fully attached into the connector with the correct amount of exposed copper. Once they find the problem connector, it can be replaced for a new one.
e195 – Critical
This critical error code can show up when the weather outside is especially hot. The HVAC system can shut down and stop sending power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will eventually power down. In the event the breakers are on, you can check a few other places before calling a professional technician.
Because this error can drain your thermostat’s battery, the first step could be providing 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 provide power with a USB cable. If it presents error code 195, you can continue to visually check components such as the wiring as well as your air conditioner’s air filter or drainage system. If you don’t uncover anything wrong with these components, it will likely be best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical malfunction with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is receiving more power than needed. This can stem from the breaker box, an error from the control board or through a faulty connection in the thermostat. A technician will meticulously investigate and test the Nest’s electrical system to determine where the power is surging or why the thermostat is convinced there’s an overcurrent problem.
Even though this error code isn’t critical, it may still stop 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 the absence of one can block your Nest from receiving enough power. You can check 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 might notice error code E297 appear. 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 stemming from an overcurrent. If excess power is sent inside the Nest’s wiring, it may 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 suggested to switch the power off straightaway. You can then get a hold of a professional technician with the proper experience diagnosing and solving electrical damage.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not getting power.
This could be as simple 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 they’re not loose or damaged. If nothing seems to be out of place, it’s best to contact a local professional.