Operating a Nest thermostat is one of the easiest ways to improve the daily schedule of your comfort system. This smart thermostat can recognize your preferences and automatically make adjustments. But as you might expect, it won’t work correctly or at all if you see an error code appear. The precise error code offers useful information about the underlying problem, something a knowledgeable technician can use to provide solutions that much faster.
Let's consider seven of the most likely error codes you could discover on your Nest thermostat. We’ll explain the basics of each error code as well as how you might solve it and the approximate cost to do so. Remember that while the price will ultimately depend on the specific Nest model, you can anticipate paying about $75-$200 for repairs. This should include travel and labor costs along with any specific components required 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 detached from the system. Since this is a critical power error, the thermostat will switch to the backup battery system. The error message will continue to be displayed until the problem is dealt with.
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 your home's electrical system. This might be the circuit breaker, fuse box or system switch. A knowledgeable technician will examine electrical connections and wiring until they uncover the source of the problem.
e294 - Critical
Critical error code e294 shows up when your Nest thermostat’s wiring needs to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first perform a factory reset of your thermostat to make sure it’s not merely a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin looking at connectors.
They’ll detach the power and progressively check each wire, ensuring they are fully inserted into the connector with the proper amount of uncovered copper. Once they find the malfunctioning connector, it can be exchanged for a new one.
e195 - Critical
This critical error code can show up when the weather outside is especially hot. The HVAC system can fail and stop delivering power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat drains and the thermostat will subsequently turn off. Assuming the breakers are on, you can examine a few other places before consulting a professional technician.
Because this error can deplete your thermostat’s battery, the first step might be restoring enough power to determine if this specific error code is what you’re working with. You can separate the thermostat from its base and deliver power through a USB cable. If it presents error code 195, you may continue to visually examine components like 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's maybe best to get in touch with a pro.
e103 - Critical
Another critical error code, e103 signifies an electrical problem with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is receiving more power than what is safe and normal. This can stem from the breaker box, an error from the control board or through a defective connection in the thermostat. A technician will meticulously examine 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.
While this error code isn’t critical, it might still prevent you from using the Nest thermostat like normal. Error code n260 refers to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from obtaining sufficient 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 need a Nest Power Connector.
During 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
Similar to error code e103, e104 is a critical error stemming from an overcurrent. If too much power is sent using the Nest’s wiring, it may damage internal components and could even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to guard against electrical damage, it’s recommended to turn the power off straightaway. You can then contact a professional technician with the appropriate experience detecting and fixing electrical issues.
e73 - Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power. This might be as straightforward as the breaker being shut off, but it could also be a problem with the wiring. After shutting 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 time to get in touch with a local professional.