Installing a Nest thermostat is one of the most convenient ways to perfect the day-to-day schedule of your HVAC system. This smart thermostat can learn your preferences and automatically make adjustments. But as you may expect, it won’t work properly or at all if you see an error code appear. The exact error code offers useful information about the source of the problem, something a trained technician can use to provide solutions that much quicker.
Let’s consider seven of the most frequent error codes you could discover on your Nest thermostat. We’ll explain the basics of each error code as well as how you could address it and the projected cost to do so. Keep in mind that while the price will ultimately be dependent on the precise Nest model, you can count on paying around $75-$200 for repairs. This should include travel and labor costs as well as any specific components required to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and is displayed 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 several reasons. The wiring may have disconnected or become damaged, or a disconnection might have occurred further along in the electrical system. This might be the circuit breaker, fuse box or system switch. A trained technician can examine electrical connections and wiring until they locate 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 simply a software problem. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start inspecting connectors.
They’ll detach the power and gradually look at each wire, making sure they are fully attached into the connector with the proper amount of bare 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 especially hot. The HVAC system can fail and stop giving power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will subsequently turn off. Assuming the breakers are on, you can search a couple of other places before consulting a professional technician.
Since this error can deplete your thermostat’s battery, the first step could be supplying enough power to determine if this specific error code is what you’re facing. You can disconnect the thermostat from its base and deliver power by using a USB cable. In the event it displays error code 195, you may continue to visually inspect components including the wiring as well as your air conditioner’s air filter or drainage system. If you can’t find anything wrong with these components, it will probably be best to contact a pro.
e103 – Critical
Another critical error code, e103 indicates 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 needed. This can stem from the breaker box, an error from the control board or thanks to a faulty connection in the thermostat. A technician should 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
Although this error code isn’t critical, it may still stop 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 getting sufficient power. You can examine the Nest’s C connector for the presence of a C wire and modify 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 show up. This can be dealt with 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
Just like error code e103, e104 is a critical error stemming from an overcurrent. If excess power is transported through the Nest’s wiring, it may damage internal components and can even be a fire hazard. If you see this error code pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s suggested to turn the power off straightaway. You can then contact a professional technician with the proper experience identifying and solving electrical malfunctions.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not receiving power.
This may 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 examine the wires to make sure nothing is loose or damaged. If nothing appears to be out of place, it’s a good idea to speak with a local professional.
