Using a Nest thermostat is one of the most convenient ways to perfect the day-to-day schedule of your comfort system. This smart thermostat can be taught your preferences and automatically make improvements. But as you can expect, it won’t work well or at all if you see an error code show up. The exact error code supplies useful information about the underlying problem, something a trained technician can use to provide solutions that much sooner.
Listed below are seven of the most common error codes you could discover on your Nest thermostat. We’ll review the basics of each error code as well as how you can address it and the approximate cost to do so. Remember that while the investment will ultimately be dependent on the precise Nest model, you can count on paying between $75-$200 for repairs. This should include travel and labor costs as well as any specific components needed to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and is displayed when the power is disconnected from the system. 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 fixed.
Losing power to your Nest thermostat can be for several reasons. The wiring might have disconnected or become damaged, or a disconnection could have occurred further along in your home’s electrical system. This could be the circuit breaker, fuse box or system switch. A knowledgeable technician will check 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 needs to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first perform a factory reset of your thermostat to ensure it’s not merely a software issue. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start checking connectors.
They’ll disconnect the power and gradually look at each wire, making sure they are fully attached into the connector with the correct amount of exposed copper. After they find the malfunctioning connector, it can be swapped for a new one.
e195 – Critical
This critical error code can appear when the weather outside is especially hot. The HVAC system can break down and stop giving power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will finally power down. Assuming the breakers are on, you can search a few other places before calling a professional technician.
As 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 deliver power through a USB cable. In the event it displays error code 195, you may continue to visually examine components like the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to 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 indicates an electrical error with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is getting more power than necessary. This will sometimes stem from the breaker box, an error from the control board or thanks to a bad connection in the thermostat. Your technician will cautiously examine and test the Nest’s electrical system to understand where the power is surging or why the thermostat thinks there’s an overcurrent problem.
Although this error code isn’t critical, it can still stop you from using the Nest thermostat like normal. 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 receiving sufficient 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 need a Nest Power Connector.
During installation of a Nest Power Connector, you may notice error code E297 show up. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector has already been installed, you’ll instead have 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 sent inside the Nest’s wiring, it could damage internal components and may even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s suggested to turn the power off straightaway. You can then get in touch with a professional technician with the proper experience detecting and fixing electrical malfunctions.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This may be as straightforward as the breaker being turned off, but it can also be an issue with the wiring. After shutting 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 looks to be out of place, it’s time to get in touch with a local professional.