Operating a Nest thermostat is one of the best ways to optimize the daily schedule of your comfort system. This smart thermostat can be taught your preferences and automatically make improvements. But as you may expect, it won’t work correctly or at all if you see an error code on the display. The specific error code provides useful information about the underlying problem, something a trained technician can use to present solutions that much sooner.
Here are seven of the most common error codes you could find on your Nest thermostat. We’ll explain the basics of each error code along with how you could solve it and the projected cost to do so. Remember that while the costs will ultimately depend on the specific Nest model, you can anticipate paying around $75-$200 for repairs. This should include things like travel and labor costs as well as any specific hardware required to finish repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and appears 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 may have happened further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A professional technician should check electrical connections and wiring until they locate the root of the problem.
e294 – Critical
Critical error code e294 shows up 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 ensure it’s not just a software issue. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin looking at connectors.
They’ll detach the power and slowly look at each wire, making sure they are fully attached into the connector with the correct amount of uncovered copper. After they find 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 particularly hot. The HVAC system can break 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 turn off. Presuming the breakers are on, you can examine a couple of other places before consulting a professional technician.
Because this error can drain your thermostat’s battery, the first step could be providing enough power to figure out if this specific error code is what you’re facing. You can separate the thermostat from its base and deliver power through a USB cable. In the event it reveals 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 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 suggests an electrical problem with your Nest thermostat. More specifically, e103 can 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 because of a bad connection in the thermostat. The technician should carefully investigate and test the Nest’s electrical system to understand where the power is surging or why the thermostat thinks there’s an overcurrent problem.
n260
While this error code isn’t critical, it could 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 not having 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 adjust the wiring itself if there is. If not, you can get a Nest Power Connector.
Due to installation of a Nest Power Connector, you will sometimes 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 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 originating from an overcurrent. If excessive power is being delivered using the Nest’s wiring, it may damage internal components and can even be a fire hazard. If you see this error code appear on your Nest thermostat and want to take steps to prevent electrical damage, it’s a good idea to shut the power off as soon as possible. You can then get a hold of a professional technician with the proper experience detecting and solving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This may be as simple as the breaker being turned 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 examine the wires to make sure they’re not loose or damaged. If nothing appears to be out of place, it’s a good idea to contact a local professional.