Using a Nest thermostat is one of the best ways to perfect the day-to-day schedule of your comfort system. This smart thermostat can learn your preferences and automatically make changes. But as you might expect, it won’t work properly or at all if you see an error code show up. The exact error code provides useful information about the root of the problem, something a knowledgeable technician can use to offer solutions that much sooner.
Let’s consider seven of the most likely error codes you could find on your Nest thermostat. We’ll review the basics of each error code along with how you might solve it and the projected cost to do so. Remember that while the price will ultimately depend on the exact Nest model, you can expect to pay between $75-$200 for repairs. This should include things like travel and labor costs along with any specific parts necessary 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 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 might have disconnected or become damaged, or a disconnection might have occurred further along in your home’s electrical system. This might be the circuit breaker, fuse box or system switch. A trained technician will examine electrical connections and wiring until they find the source of the problem.
e294 – Critical
Critical error code e294 shows up when your Nest thermostat’s wiring has to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first complete a factory reset of your thermostat to make sure it’s not just a software problem. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start checking connectors.
They’ll detach the power and gradually look at each wire, making sure they are fully placed into the connector with the correct amount of exposed copper. When they pinpoint the problem connector, it can be swapped for a new one.
e195 – Critical
This critical error code can show up when the weather outside is particularly hot. The HVAC system can fail and stop giving power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will eventually power down. In the event the breakers are on, you can examine a couple of other places before contacting a professional technician.
Since this error can drain your thermostat’s battery, the first step could be providing enough power to find out 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 reveals 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 can’t find anything wrong with these components, it will likely be best to call 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 necessary. This will sometimes stem from the breaker box, an error from the control board or thanks to a faulty connection in the thermostat. The technician can meticulously investigate and test the Nest’s electrical system to determine where the power is surging or why the thermostat believes there’s an overcurrent problem.
n260
While this error code isn’t critical, it could still prevent you from using the Nest thermostat how you prefer to. Error code n260 pertains 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 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.
Due to installation of a Nest Power Connector, you might 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 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 excess power is transported through the Nest’s wiring, it can damage internal components and can 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 a good idea to turn the power off as soon as you can. You can then get in touch with a professional technician with the proper experience diagnosing and solving electrical damage.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This might be as straightforward as the breaker being turned off, but it may also be a problem with the wiring. After switching off the power to your HVAC system and thermostat, you can visually examine the wires to make sure none of them are loose or damaged. If nothing appears to be out of place, it’s time to contact a local professional.
