Operating a Nest thermostat is one of the best ways to optimize the everyday schedule of your comfort system. This smart thermostat can be taught your preferences and automatically make changes. But as you may expect, it won’t work well or at all if you see an error code on the display. The exact error code offers useful information about the source of the problem, something a trained technician can use to present solutions that much faster.
Here are seven of the most common error codes you may find on your Nest thermostat. We’ll review the basics of each error code as well as how you might solve it and the projected cost to do so. Keep in mind that while the price will ultimately depend on the precise Nest model, you can expect to pay between $75-$200 for repairs. This should include travel and labor costs on top of any specific parts necessary to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and appears when the power is shut off. Since this is a critical power error, the thermostat will swap to the backup battery system. The error message will continue to be displayed until the issue is resolved.
Losing power to your Nest thermostat can be for several reasons. The wiring may have disconnected or become damaged, or a disconnection may have appeared further along in the electrical system. This may be the circuit breaker, fuse box or system switch. A trained technician should inspect electrical connections and wiring until they find the source of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring has to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first complete a factory reset of your thermostat to make sure it’s not just a software problem. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin inspecting connectors.
They’ll shut off the power and progressively inspect each wire, making sure they are fully placed into the connector with the proper amount of uncovered copper. Once they locate the damaged connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can show up when the weather outside is severely hot. The HVAC system can shut down and stop giving power to your Nest thermostat. When this problem persists, the backup battery in your thermostat depletes and the thermostat will subsequently turn off. In the event the breakers are on, you can examine a couple of other places before consulting a professional technician.
Since this error can deplete your thermostat’s battery, the first step may be supplying enough power to figure out if this specific error code is what you’re working with. You can separate the thermostat from its base and deliver power with a USB cable. In the event it reveals error code 195, you should continue to visually inspect components like the wiring as well as your air conditioner’s air filter or drainage system. If you don’t find anything wrong with these components, it will likely be best to call a pro.
e103 – Critical
Another critical error code, e103 signifies 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 necessary. This can stem from the breaker box, an error from the control board or through a defective connection in the thermostat. The technician can cautiously examine and test the Nest’s electrical system to determine where the power is surging or why the thermostat believes there’s an overcurrent problem.
While this error code isn’t critical, it might still stop you from using the Nest thermostat like normal. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from obtaining adequate power. You can check 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.
Due to installation of a Nest Power Connector, you might notice error code E297 show up. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector has already been installed, you’ll instead have 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 that’s the result of an overcurrent. If excess power is sent inside the Nest’s wiring, it may damage internal components and can even be a fire hazard. If you notice this error code show up on your Nest thermostat and want to guard against electrical damage, it’s recommended to switch the power off straightaway. You can then contact a professional technician with the appropriate experience identifying and solving electrical malfunctions.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not receiving power.
This might be as simple as the breaker being shut off, but it could also be a problem with the wiring. After switching off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure none of them are loose or damaged. If nothing appears to be out of place, it’s best to speak with a local professional.