Using a Nest thermostat is one of the easiest ways to optimize the everyday schedule of your comfort system. This smart thermostat can learn your preferences and automatically make improvements. But as you might expect, it won’t work well or at all if you see an error code appear. The specific error code offers useful information about the root of the problem, something a knowledgeable technician can use to offer solutions that much faster.
Let’s consider seven of the most likely error codes you might encounter on your Nest thermostat. We’ll explain the basics of each error code as well as how you could solve it and the estimated cost to do so. Keep in mind that while the costs will ultimately hinge on the exact Nest model, you can expect to pay between $75-$200 for repairs. This should include things like travel and labor costs as well as any specific hardware necessary to finish repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and shows up when the power is disconnected from the system. Because 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 fixed.
Losing power to your Nest thermostat can be for numerous reasons. The wiring may 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 should check electrical connections and wiring until they find 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, the technician should 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 check the wiring diagram of the thermostat and begin looking at connectors.
They’ll shut off the power and progressively inspect each wire, ensuring they are fully attached into the connector with the proper amount of uncovered copper. Once they pinpoint the malfunctioning connector, it can be replaced for a new one.
e195 – Critical
This critical error code can surface when the weather outside is severely hot. The HVAC system can fail and stop sending power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat depletes and the thermostat will subsequently power down. Presuming the breakers are on, you can examine a few other places before contacting a professional technician.
Since this error can consume your thermostat’s battery, the first step might be supplying enough power to determine if this specific error code is what you’re facing. You can separate the thermostat from its base and deliver power with a USB cable. If it presents error code 195, you should continue to visually inspect components including 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 thanks to a bad connection in the thermostat. A technician needs to meticulously investigate and test the Nest’s electrical system to figure out where the power is surging or why the thermostat is convinced there’s an overcurrent problem.
n260
Even though this error code isn’t critical, it could still keep you from using the Nest thermostat how you prefer to. 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 adequate power. You can check the Nest’s C connector for the presence of a C wire and adapt the wiring itself if there is. If not, you’ll need a Nest Power Connector.
With installation of a Nest Power Connector, you may notice error code E297 appear. 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 originating from an overcurrent. If too much power is sent through the Nest’s wiring, it could damage internal components and may even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s recommended to shut the power off as soon as you can. You can then get a hold of a professional technician with the proper experience identifying and solving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power.
This will sometimes be as simple as the breaker being turned off, but it could also be an issue 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 a good idea to speak with a local professional.