Using a Nest thermostat is one of the best ways to optimize the day-to-day schedule of your comfort system. This smart thermostat can recognize your preferences and automatically make adjustments. But as you might expect, it won’t work correctly or at all if you see an error code on the display. The exact error code offers useful information about the source 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 discover on your Nest thermostat. We’ll explain the basics of each error code on top of how you could address 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 between $75-$200 for repairs. This should also cover travel and labor costs along with any specific parts necessary to complete repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and shows up when the power is shut off. Since this is a critical power error, the thermostat will change to the backup battery system. The error message will remain on display until the issue is resolved.
Losing power to your Nest thermostat can be for several reasons. The wiring may have disconnected or become damaged, or a disconnection might have happened further along in your electrical system. This might be the circuit breaker, fuse box or system switch. A trained technician should check electrical connections and wiring until they locate the root of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring should be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first complete a factory reset of your thermostat to make sure it’s not simply a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin inspecting connectors.
They’ll disconnect the power and gradually check each wire, seeing to it that they are fully inserted into the connector with the proper amount of exposed copper. After they find the problem connector, it can be swapped for a new one.
e195 – Critical
This critical error code can appear when the weather outside is severely hot. The HVAC system can shut down and stop giving power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat depletes and the thermostat will subsequently power down. In the event the breakers are on, you can check a handful of other places before calling a professional technician.
Since this error can drain your thermostat’s battery, the first step might be restoring enough power to determine if this specific error code is what you’re dealing with. You can detach the thermostat from its base and supply power with a USB cable. If it displays error code 195, you should continue to visually check components including the wiring as well as your air conditioner’s air filter or drainage system. If you don’t 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 malfunction with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is getting 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. The technician can meticulously 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 could still keep you from using the Nest thermostat how you prefer to. Error code n260 concerns the lack of a C wire or Nest Power Connector, as not having 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 adjust the wiring itself if there is. If not, you’ll need a Nest Power Connector.
During installation of a Nest Power Connector, you might notice error code E297 be displayed. This can be resolved 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 originating from an overcurrent. If excess power is transported inside the Nest’s wiring, it can damage internal components and can 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 suggested to turn the power off as soon as possible. You can then get a hold of a professional technician with the necessary experience detecting and solving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This might be as simple as the breaker being switched off, but it could also be an issue with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually check the wires to make sure nothing is loose or damaged. If nothing seems to be out of place, it’s a good idea to get in touch with a local professional.
