Operating a Nest thermostat is one of the most convenient ways to improve the daily schedule of your HVAC system. This smart thermostat can recognize your preferences and automatically make adjustments. But as you can expect, it won’t work properly or at all if you see an error code on the display. The specific error code offers useful information about the source of the problem, something a trained technician can use to offer solutions that much sooner.
Let’s consider seven of the most common error codes you might find on your Nest thermostat. We’ll explain the basics of each error code along with how you can solve it and the projected cost to do so. Remember that while the price will ultimately depend on the precise Nest model, you can count on paying about $75-$200 for repairs. This should include things like travel and labor costs along with any specific hardware needed to complete repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and appears when the power is detached from the system. As this is a critical power error, the thermostat will change to the backup battery system. The error message will remain on the screen until the problem is dealt with.
Losing power to your Nest thermostat can be for a number of reasons. The wiring may have disconnected or become damaged, or a disconnection could have occurred further along in your home’s electrical system. This may be the circuit breaker, fuse box or system switch. A trained technician can examine electrical connections and wiring until they find the source 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 perform a factory reset of your thermostat to ensure it’s not merely a software problem. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin looking at connectors.
They’ll disconnect the power and gradually inspect each wire, seeing to it that they are fully inserted into the connector with the proper amount of uncovered copper. After they locate the damaged connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can surface when the weather outside is especially hot. The HVAC system can fail and stop delivering power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will finally power down. Assuming the breakers are on, you can inspect a few other places before consulting a professional technician.
Because this error can drain your thermostat’s battery, the first step may be supplying enough power to determine if this specific error code is what you’re facing. You can detach the thermostat from its base and deliver power by using a USB cable. Assuming it presents error code 195, you can continue to visually inspect components like 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 malfunction with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is experiencing more power than necessary. This can stem from the breaker box, an error from the control board or through a defective connection in the thermostat. A technician needs to cautiously 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
Although 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 receiving adequate 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.
During installation of a Nest Power Connector, you may notice error code E297 show up. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead need 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 too much power is sent through the Nest’s wiring, it may damage internal components and can even be a fire hazard. If you see this error code appear on your Nest thermostat and want to take steps to prevent electrical damage, it’s recommended to shut the power off as soon as possible. You can then get a hold of a professional technician with the proper experience detecting and resolving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not receiving power.
This will sometimes be as easy as the breaker being switched off, but it can also be a problem with the wiring. After turning off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure nothing is loose or damaged. If nothing appears to be out of place, it’s time to speak with a local professional.
