Using a Nest thermostat is one of the easiest ways to optimize the everyday schedule of your heating and cooling. This smart thermostat can recognize your preferences and automatically make improvements. But as you can expect, it won’t work correctly or at all if you see an error code on the display. The precise error code provides useful information about the root of the problem, something a professional technician can use to provide solutions that much quicker.
Let’s consider seven of the most likely error codes you might find on your Nest thermostat. We’ll explain the basics of each error code along with how you might fix it and the estimated cost to do so. Keep in mind that while the costs will ultimately depend on the specific Nest model, you can expect to pay around $75-$200 for repairs. This should include things like travel and labor costs as well as any specific hardware required to wrap up repairs.
e298 – Critical
This critical error code is limited to new 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 swap to the backup battery system. The error message will remain on display until the problem is resolved.
Losing power to your Nest thermostat can be for a number of reasons. The wiring might have disconnected or become damaged, or a disconnection may have appeared further along in the electrical system. This might be the circuit breaker, fuse box or system switch. A trained technician will inspect 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 needs to be reconfigured. More specifically, you’ll need the technician to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not merely a software error. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start checking connectors.
They’ll disconnect the power and gradually inspect each wire, seeing to it that they are fully placed into the connector with the correct amount of bare 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 giving power to your Nest thermostat. When this problem lasts, 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 handful of other places before contacting a professional technician.
Since this error can deplete your thermostat’s battery, the first step may be providing enough power to determine if this specific error code is what you’re facing. You can separate the thermostat from its base and provide power through a USB cable. If it displays error code 195, you can continue to visually check components such as the wiring as well as your air conditioner’s air filter or drainage system. If you can’t detect anything wrong with these components, it will likely be best to contact a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical error 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 may stem from the breaker box, an error from the control board or thanks to a faulty connection in the thermostat. A technician needs to carefully investigate 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
Even though this error code isn’t critical, it can still stop you from using the Nest thermostat how you want to. Error code n260 refers to the lack of a C wire or Nest Power Connector, as the absence of one can block your Nest from receiving adequate power. You can check the Nest’s C connector for the presence of a C wire and adjust the wiring itself if there is. If not, you’ll need a Nest Power Connector.
Due to installation of a Nest Power Connector, you will sometimes notice error code E297 show up. This can be resolved by updating your thermostat in Settings -> Software -> Update. If the Power Connector has already been 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 too much power is transported inside the Nest’s wiring, it can damage internal components and may 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 a good idea to switch the power off straightaway. You can then get in touch with a professional technician with the necessary experience diagnosing and solving electrical damage.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not getting power.
This will sometimes be as easy as the breaker being turned off, but it can also be a problem with the wiring. After turning off the power to your HVAC system and thermostat, you can visually examine the wires to make sure none of them are loose or damaged. If nothing seems to be out of place, it’s best to contact a local professional.