Using a Nest thermostat is one of the most convenient ways to improve the day-to-day schedule of your heating and cooling. This smart thermostat can recognize 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 root of the problem, something a knowledgeable technician can use to provide solutions that much sooner.
Listed below are seven of the most common error codes you could find on your Nest thermostat. We’ll explain the basics of each error code as well as how you can solve it and the projected cost to do so. Don’t forget 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 as well as any specific hardware needed to finish repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and is displayed when the power is disconnected from the system. As this is a critical power error, the thermostat will switch to the backup battery system. The error message will remain on display until the problem is fixed.
Losing power to your Nest thermostat can be for several reasons. The wiring could have disconnected or become damaged, or a disconnection might have happened further along in your home’s electrical system. This might be the circuit breaker, fuse box or system switch. A certified 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, the technician will need to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to make sure it’s not merely a software problem. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin inspecting connectors.
They’ll detach the power and progressively inspect each wire, ensuring they are fully inserted into the connector with the correct amount of uncovered copper. When they locate the problem connector, it can be replaced for a new one.
e195 – Critical
This critical error code can surface 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 depletes and the thermostat will subsequently shut down. Presuming the breakers are on, you can search a couple of other places before calling a professional technician.
As 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 supply power by using a USB cable. In the event it displays error code 195, you may continue to visually inspect components such as the wiring as well as your air conditioner’s air filter or drainage system. If you can’t find anything wrong with these components, it’s maybe best to call 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 getting more power than what is safe and normal. This may stem from the breaker box, an error from the control board or because of a faulty connection in the thermostat. The technician should cautiously investigate and test the Nest’s electrical system to figure out 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 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 the absence of one can block your Nest from obtaining sufficient power. You can examine the Nest’s C connector for the presence of a C wire and adapt 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 appear. This can be remedied 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
Just like error code e103, e104 is a critical error stemming from an overcurrent. If excess power is sent using the Nest’s wiring, it could damage internal components and could even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to take steps to prevent electrical damage, it’s recommended to shut the power off straightaway. You can then get in touch with a professional technician with the necessary experience identifying and fixing electrical malfunctions.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power.
This may be as simple as the breaker being switched off, but it may also be an issue with the wiring. After switching off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure they’re not loose or damaged. If nothing looks to be out of place, it’s time to get in touch with a local professional.
