Using a Nest thermostat is one of the easiest ways to perfect the day-to-day schedule of your HVAC system. This smart thermostat can recognize your preferences and automatically make changes. But as you might expect, it won’t work well or at all if you see an error code appear. The exact error code provides useful information about the root of the problem, something a professional technician can use to provide solutions that much faster.
Let’s consider seven of the most likely error codes you may discover on your Nest thermostat. We’ll explain the basics of each error code along with how you can address it and the projected cost to do so. Don’t forget that while the costs will ultimately depend on the exact Nest model, you can count on paying between $75-$200 for repairs. This should include things like travel and labor costs as well as any specific components required to wrap up repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and is displayed 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 continue to be displayed until the problem is dealt with.
Losing power to your Nest thermostat can be for numerous reasons. The wiring may have disconnected or become damaged, or a disconnection may have occurred further along in the electrical system. This could be the circuit breaker, fuse box or system switch. A knowledgeable technician should examine electrical connections and wiring until they find the root 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 make sure it’s not just a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start checking connectors.
They’ll detach the power and gradually inspect each wire, making sure they are fully placed into the connector with the correct amount of exposed copper. After 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 particularly hot. The HVAC system can shut down and stop delivering power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat drains and the thermostat will finally shut down. Presuming the breakers are on, you can examine a couple of other places before calling a professional technician.
As this error can drain your thermostat’s battery, the first step might be supplying enough power to find out if this specific error code is what you’re working with. You can disconnect the thermostat from its base and provide power by using a USB cable. Assuming it presents error code 195, you should continue to visually examine components like the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to find anything wrong with these components, it’s maybe best to call a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical error with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is experiencing more power than necessary. This will sometimes stem from the breaker box, an error from the control board or thanks to a faulty connection in the thermostat. A technician should meticulously inspect 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.
While this error code isn’t critical, it can 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 missing one can block your Nest from receiving sufficient power. You can inspect 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.
During installation of a Nest Power Connector, you might notice error code E297 show up. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector was already installed, you’ll instead be required to update the wiring info in the app from Settings -> Thermostat -> Wiring -> Update wiring.
e104 – Critical
Similar to error code e103, e104 is a critical error that’s the result of an overcurrent. If too much power is being delivered using the Nest’s wiring, it may damage internal components and could even be a fire hazard. If you see this error code pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s suggested to switch the power off straightaway. You can then get a hold of a professional technician with the proper experience diagnosing and fixing electrical damage.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power.
This could be as straightforward as the breaker being shut off, but it can also be something with the wiring. After switching off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure none of them are loose or damaged. If nothing seems to be out of place, it’s time to get in touch with a local professional.