Installing a Nest thermostat is one of the best ways to perfect the daily schedule of your comfort system. This smart thermostat can be taught your preferences and automatically make changes. But as you can expect, it won’t work well or at all if you see an error code appear. The exact error code provides useful information about the source of the problem, something a professional technician can use to offer solutions that much sooner.
Let’s consider seven of the most likely error codes you could encounter on your Nest thermostat. We’ll review the basics of each error code on top of how you could fix it and the projected cost to do so. Don’t forget that while the investment will ultimately hinge on the specific 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 needed to wrap up repairs.
e298 – Critical
This critical error code is limited to the latest 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 swap to the backup battery system. The error message will remain on display until the issue is dealt with.
Losing power to your Nest thermostat can be for several reasons. The wiring might have disconnected or become damaged, or a disconnection may have occurred further along in the electrical system. This may be the circuit breaker, fuse box or system switch. A trained technician will inspect electrical connections and wiring until they find the root of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring has 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 just a software issue. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and begin looking at connectors.
They’ll detach the power and slowly look at each wire, ensuring they are fully attached into the connector with the proper amount of uncovered copper. When they pinpoint the problem connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can show up when the weather outside is particularly hot. The HVAC system can shut down and stop giving power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat depletes and the thermostat will eventually turn off. In the event the breakers are on, you can examine a couple of other places before contacting a professional technician.
Because this error can consume your thermostat’s battery, the first step could be supplying enough power to determine if this specific error code is what you’re dealing with. You can disconnect the thermostat from its base and supply power through a USB cable. If it presents error code 195, you can continue to visually examine components such as the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to uncover anything wrong with these components, it’s maybe 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 will refer to an overcurrent problem, which means the wiring is experiencing more power than what is safe and normal. This can stem from the breaker box, an error from the control board or thanks to a faulty connection in the thermostat. Your technician will cautiously investigate 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
While this error code isn’t critical, it can still keep you from using the Nest thermostat like normal. 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 adequate 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 can get 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 is already installed, you’ll instead be required to update the wiring info in the app from Settings -> Thermostat -> Wiring -> Update wiring.
e104 – Critical
Like error code e103, e104 is a critical error originating from an overcurrent. If excess power is transported through the Nest’s wiring, it can damage internal components and may 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 recommended to switch the power off straightaway. You can then get in touch with a professional technician with the appropriate experience identifying and fixing electrical damage.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not receiving power.
This could be as easy as the breaker being switched 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 examine the wires to make sure none of them are loose or damaged. If nothing appears to be out of place, it’s best to get in touch with a local professional.