Installing a Nest thermostat is one of the most convenient ways to optimize the daily schedule of your comfort system. This smart thermostat can be taught your preferences and automatically make changes. But as you might expect, it won’t work correctly or at all if you see an error code on the display. The precise error code supplies useful information about the root of the problem, something a knowledgeable technician can use to present solutions that much quicker.
Here are seven of the most frequent error codes you might discover on your Nest thermostat. We’ll review the basics of each error code on top of how you could address it and the projected cost to do so. Keep in mind that while the costs will ultimately hinge on the exact Nest model, you can expect to pay about $75-$200 for repairs. This should include travel and labor costs as well as any specific hardware needed to wrap up repairs.
e298 - Critical
This critical error code is limited to the latest models of the Nest thermostat and is displayed when the power is shut off. Because this is a critical power error, the thermostat will switch to the backup battery system. The error message will remain on the screen until the issue 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 occurred further along in your home's electrical system. This could be the circuit breaker, fuse box or system switch. A trained technician will inspect electrical connections and wiring until they locate the source of the problem.
e294 - Critical
Critical error code e294 appears when your Nest thermostat’s wiring should 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 just a software error. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and begin inspecting connectors.
They’ll detach the power and gradually check each wire, making sure they are fully attached into the connector with the proper amount of exposed copper. Once they pinpoint the damaged connector, it can be exchanged for a new one.
e195 - Critical
This critical error code can appear when the weather outside is particularly hot. The HVAC system can fail and stop giving power to your Nest thermostat. When this problem persists, the backup battery in your thermostat depletes and the thermostat will subsequently turn off. In the event the breakers are on, you can inspect a couple of other places before calling a professional technician.
Because this error can deplete your thermostat’s battery, the first step could be restoring enough power to determine if this specific error code is what you’re facing. You can separate the thermostat from its base and supply power with a USB cable. If it presents 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 don’t uncover anything wrong with these components, it will probably be best to get in touch with a pro.
e103 - Critical
Another critical error code, e103 signifies an electrical problem with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is experiencing more power than needed. This may 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 examine and test the Nest’s electrical system to understand where the power is surging or why the thermostat believes there’s an overcurrent problem.
While this error code isn’t critical, it may still prevent 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 not having one can block your Nest from obtaining enough 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 can get a Nest Power Connector.
With installation of a Nest Power Connector, you will sometimes 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
Like error code e103, e104 is a critical error that's the result of an overcurrent. If excessive power is being delivered using the Nest’s wiring, it could damage internal components and could even be a fire hazard. If you see this error code show up on your Nest thermostat and want to take steps to prevent electrical damage, it’s a good idea to turn the power off as soon as you can. You can then contact a professional technician with the appropriate experience detecting and solving electrical problems.
e73 - Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not receiving power. This might be as straightforward 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 check 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.