Using a Nest thermostat is one of the most convenient ways to optimize the everyday schedule of your heating and cooling. This smart thermostat can recognize your preferences and automatically make adjustments. But as you might expect, it won’t work properly or at all if you see an error code appear. The exact error code supplies useful information about the underlying problem, something a trained technician can use to provide solutions that much sooner.
Here are seven of the most common error codes you might find on your Nest thermostat. We’ll review the basics of each error code as well as how you can solve it and the estimated cost to do so. Keep in mind that while the costs will ultimately be dependent on the precise Nest model, you can anticipate paying about $75-$200 for repairs. This should also cover travel and labor costs on top of 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 detached from the system. Since this is a critical power error, the thermostat will swap to the backup battery system. The error message will remain on the screen until the issue is fixed.
Losing power to your Nest thermostat can be for several reasons. The wiring may have disconnected or become damaged, or a disconnection could have appeared further along in your electrical system. This might be the circuit breaker, fuse box or system switch. A professional technician will examine electrical connections and wiring until they uncover 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 just a software error. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin checking connectors.
They’ll detach the power and gradually look at each wire, making sure they are fully attached into the connector with the proper amount of bare copper. When they pinpoint the malfunctioning connector, it can be replaced for a new one.
e195 – Critical
This critical error code can show up when the weather outside is especially hot. The HVAC system can fail and stop sending power to your Nest thermostat. When this problem persists, the backup battery in your thermostat drains and the thermostat will finally power down. Assuming the breakers are on, you can inspect a couple of other places before calling a professional technician.
Since this error can drain your thermostat’s battery, the first step could be restoring enough power to find out if this specific error code is what you’re working with. You can separate the thermostat from its base and deliver power through a USB cable. In the event it displays error code 195, you can continue to visually examine components such as the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to 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 suggests an electrical malfunction with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is receiving more power than needed. This will sometimes stem from the breaker box, an error from the control board or thanks to a bad connection in the thermostat. A technician should meticulously inspect and test the Nest’s electrical system to understand where the power is surging or why the thermostat thinks 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 the absence of one can block your Nest from getting sufficient 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.
Due to installation of a Nest Power Connector, you may notice error code E297 be displayed. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector has already been 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 excessive power is being delivered through the Nest’s wiring, it may damage internal components and may even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to protect from electrical damage, it’s a good idea to shut the power off straightaway. You can then get a hold of a professional technician with the appropriate experience detecting and solving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power.
This could be as simple as the breaker being turned off, but it can also be a problem with the wiring. After shutting 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.