Operating a Nest thermostat is one of the best ways to optimize the daily schedule of your heating and cooling. This smart thermostat can be taught your preferences and automatically make changes. But as you might expect, it won’t work properly or at all if you see an error code on the display. The specific error code provides useful information about the source of the problem, something a trained technician can use to offer solutions that much quicker.
Here are seven of the most likely error codes you might discover on your Nest thermostat. We’ll review the basics of each error code along with how you can fix it and the estimated cost to do so. Keep in mind 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 as well as any specific components needed to wrap up repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and shows up when the power is disconnected from the system. Because this is a critical power error, the thermostat will change to the backup battery system. The error message will remain on display until the problem is resolved.
Losing power to your Nest thermostat can be for a number of reasons. The wiring could have disconnected or become damaged, or a disconnection could have happened further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A professional technician can examine electrical connections and wiring until they uncover the source of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring needs to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to ensure it’s not merely a software issue. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin inspecting connectors.
They’ll disconnect the power and gradually inspect each wire, seeing to it that they are fully inserted into the connector with the correct amount of exposed copper. When they find the problem connector, it can be replaced for a new one.
e195 – Critical
This critical error code can appear when the weather outside is particularly 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 subsequently shut down. In the event the breakers are on, you can inspect a couple of other places before consulting a professional technician.
As this error can drain your thermostat’s battery, the first step might be restoring enough power to find out if this specific error code is what you’re working with. 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 can continue to visually inspect components such as the wiring as well as your air conditioner’s air filter or drainage system. If you can’t 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 signifies an electrical issue with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is receiving more power than needed. This may stem from the breaker box, an error from the control board or thanks to a defective connection in the thermostat. A technician will carefully inspect 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 stop 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 not having one can block your Nest from obtaining enough power. You can inspect the Nest’s C connector for the presence of a C wire and adjust the wiring itself if there is. If not, you can get a Nest Power Connector.
With installation of a Nest Power Connector, you might notice error code E297 be displayed. This can be resolved 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 originating from an overcurrent. If excess power is sent through the Nest’s wiring, it can damage internal components and may even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s recommended to switch the power off as soon as you can. You can then contact a professional technician with the necessary experience identifying and resolving electrical malfunctions.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This could be as easy as the breaker being shut off, but it may also be a problem with the wiring. After switching 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 looks to be out of place, it’s time to speak with a local professional.