Operating a Nest thermostat is one of the most convenient ways to optimize the day-to-day 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 correctly or at all if you see an error code appear. The exact error code supplies useful information about the source of the problem, something a professional technician can use to provide solutions that much faster.
Here are seven of the most common error codes you might encounter on your Nest thermostat. We’ll explain the basics of each error code on top of how you might address it and the approximate cost to do so. Don’t forget that while the costs will ultimately depend on the specific Nest model, you can count on paying around $75-$200 for repairs. This should include things like travel and labor costs along with any specific components necessary to finish repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and shows up when the power is detached from the system. As this is a critical power error, the thermostat will switch to the backup battery system. The error message will continue to be displayed until the issue is dealt with.
Losing power to your Nest thermostat can be for several reasons. The wiring may have disconnected or become damaged, or a disconnection may have occurred further along in your home’s electrical system. This might be the circuit breaker, fuse box or system switch. A knowledgeable technician can check electrical connections and wiring until they uncover the root of the problem.
e294 – Critical
Critical error code e294 appears 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 just a software issue. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin looking at connectors.
They’ll detach the power and slowly check each wire, ensuring they are fully placed into the connector with the proper amount of exposed copper. When they locate the problem connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can show up when the weather outside is especially hot. The HVAC system can break down and stop delivering power to your Nest thermostat. When this problem persists, the backup battery in your thermostat depletes and the thermostat will eventually turn off. Assuming the breakers are on, you can search a few other places before contacting a professional technician.
Since this error can consume your thermostat’s battery, the first step may be providing enough power to determine if this specific error code is what you’re working with. You can disconnect the thermostat from its base and provide power through a USB cable. Assuming it displays error code 195, you may continue to visually examine 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 likely be best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 indicates an electrical malfunction with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is getting more power than needed. This can stem from the breaker box, an error from the control board or because of a bad connection in the thermostat. A technician will meticulously inspect and test the Nest’s electrical system to determine where the power is surging or why the thermostat is convinced there’s an overcurrent problem.
While this error code isn’t critical, it could still prevent you from using the Nest thermostat how you want to. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from receiving enough 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’ll need a Nest Power Connector.
During installation of a Nest Power Connector, you will sometimes notice error code E297 be displayed. This can be dealt with 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
Just like error code e103, e104 is a critical error originating from an overcurrent. If excessive power is transported using the Nest’s wiring, it can damage internal components and can even be a fire hazard. If you see this error code appear on your Nest thermostat and want to guard against electrical damage, it’s suggested to shut the power off straightaway. You can then get in touch with a professional technician with the appropriate experience identifying and resolving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This will sometimes be as easy as the breaker being turned off, but it could also be an issue with the wiring. After switching off the power to your HVAC system and thermostat, you can visually examine the wires to make sure they’re not loose or damaged. If nothing appears to be out of place, it’s a good idea to contact a local professional.