Using a Nest thermostat is one of the best ways to optimize the everyday schedule of your heating and cooling. This smart thermostat can be taught your preferences and automatically make improvements. But as you might expect, it won’t work correctly or at all if you see an error code on the display. The specific error code offers useful information about the root of the problem, something a knowledgeable technician can use to provide solutions that much faster.
Listed below are seven of the most common error codes you might encounter on your Nest thermostat. We’ll review the basics of each error code as well as how you could fix it and the approximate cost to do so. Don’t forget that while the costs will ultimately depend on the specific Nest model, you can count on paying about $75-$200 for repairs. This should include things like travel and labor costs on top of any specific parts needed to wrap up 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 switch to the backup battery system. The error message will remain on display until the problem is fixed.
Losing power to your Nest thermostat can be for several reasons. The wiring could have disconnected or become damaged, or a disconnection might have occurred further along in the electrical system. This may be the circuit breaker, fuse box or system switch. A certified technician can inspect electrical connections and wiring until they locate the root of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring needs to be reconfigured. More specifically, the technician will need to 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 review the wiring diagram of the thermostat and begin checking connectors.
They’ll detach the power and gradually inspect each wire, ensuring they are fully inserted into the connector with the proper amount of bare copper. After they locate the malfunctioning 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 delivering power to your Nest thermostat. When this problem persists, the backup battery in your thermostat depletes and the thermostat will finally turn off. Assuming the breakers are on, you can search a few other places before calling a professional technician.
Since this error can drain your thermostat’s battery, the first step might be supplying enough power to find out if this specific error code is what you’re facing. You can disconnect the thermostat from its base and deliver power through a USB cable. In the event it reveals error code 195, you should continue to visually inspect components including the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to detect anything wrong with these components, it will likely be best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 indicates an electrical issue with your Nest thermostat. More specifically, e103 can 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 because of a bad connection in the thermostat. Your technician should carefully 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.
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 refers to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from getting sufficient power. You can inspect the Nest’s C connector for the presence of a C wire and modify the wiring itself if there is. If not, you 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 has already been 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 stemming from an overcurrent. If excessive power is transported using the Nest’s wiring, it could damage internal components and could even be a fire hazard. If you see this error code show up on your Nest thermostat and want to take steps to prevent electrical damage, it’s suggested to switch the power off straightaway. You can then contact a professional technician with the proper experience detecting 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 switched off, but it may also be an issue 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 looks to be out of place, it’s time to contact a local professional.