Using a Nest thermostat is one of the most convenient ways to improve 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 correctly or at all if you see an error code show up. The exact error code offers useful information about the underlying problem, something a trained technician can use to present solutions that much quicker.
Here are seven of the most common error codes you may discover on your Nest thermostat. We’ll explain the basics of each error code on top of how you can address it and the projected cost to do so. Don’t forget that while the costs will ultimately hinge on the precise Nest model, you can anticipate paying about $75-$200 for repairs. This should also cover travel and labor costs along with any specific hardware required to complete repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and is displayed when the power is detached from the system. Because this is a critical power error, the thermostat will switch to the backup battery system. The error message will remain on display until the issue is fixed.
Losing power to your Nest thermostat can be for several reasons. The wiring may have disconnected or become damaged, or a disconnection could have appeared further along in your home’s electrical system. This may be the circuit breaker, fuse box or system switch. A trained technician can examine electrical connections and wiring until they find the root of the problem.
e294 – Critical
Critical error code e294 is displayed when your Nest thermostat’s wiring has to be reconfigured. More specifically, you’ll need the technician to reconfigure the R wire. They’ll first perform a factory reset of your thermostat to make sure it’s not simply a software issue. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start looking at connectors.
They’ll disconnect the power and gradually check each wire, ensuring they are fully attached into the connector with the proper amount of exposed copper. Once they locate 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 particularly hot. The HVAC system can break down and stop sending power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat drains and the thermostat will eventually shut down. Presuming the breakers are on, you can search a handful of other places before calling a professional technician.
Since this error can drain your thermostat’s battery, the first step might be providing enough power to determine if this specific error code is what you’re facing. You can detach the thermostat from its base and deliver power through a USB cable. Assuming it displays error code 195, you may continue to visually inspect components including 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 contact a pro.
e103 – Critical
Another critical error code, e103 suggests 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 necessary. This will sometimes stem from the breaker box, an error from the control board or through a bad connection in the thermostat. Your technician can meticulously examine and test the Nest’s electrical system to determine where the power is surging or why the thermostat thinks there’s an overcurrent problem.
n260
While this error code isn’t critical, it can still stop you from using the Nest thermostat like normal. Error code n260 concerns the lack of a C wire or Nest Power Connector, as missing one can block your Nest from receiving sufficient power. You can examine 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.
During installation of a Nest Power Connector, you may notice error code E297 show up. 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 that’s the result of an overcurrent. If excess power is transported through the Nest’s wiring, it may damage internal components and could even be a fire hazard. If you see this error code appear on your Nest thermostat and want to guard against electrical damage, it’s recommended to turn the power off as soon as possible. You can then get in touch with a professional technician with the proper experience identifying and fixing electrical problems.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This could be as simple as the breaker being shut off, but it can also be a problem with the wiring. After shutting 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 best to speak with a local professional.