Using a Nest thermostat is one of the best ways to improve the everyday schedule of your heating and cooling. This smart thermostat can recognize your preferences and automatically make improvements. But as you may expect, it won’t work well or at all if you see an error code show up. The precise error code supplies useful information about the root of the problem, something a trained technician can use to present solutions that much faster.
Here are seven of the most likely error codes you could find on your Nest thermostat. We’ll review the basics of each error code as well as how you might fix it and the projected cost to do so. Don’t forget that while the price will ultimately hinge on the specific Nest model, you can expect to pay around $75-$200 for repairs. This should also cover travel and labor costs along with any specific hardware necessary to finish repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and appears when the power is disconnected from the system. As 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 dealt with.
Losing power to your Nest thermostat can be for several reasons. The wiring might have disconnected or become damaged, or a disconnection may have occurred further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A professional technician will inspect electrical connections and wiring until they find the source of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring should 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 simply a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start inspecting connectors.
They’ll detach the power and gradually look at each wire, making sure they are fully inserted into the connector with the proper amount of exposed copper. When they pinpoint the problem connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can appear when the weather outside is especially 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 depletes and the thermostat will subsequently power down. In the event the breakers are on, you can examine a couple of other places before contacting a professional technician.
Because this error can deplete your thermostat’s battery, the first step may 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 through a USB cable. In the event it presents error code 195, you can continue to visually inspect components like 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 probably be best to contact a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical issue with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is receiving more power than needed. This may stem from the breaker box, an error from the control board or thanks to a faulty connection in the thermostat. A technician needs to carefully investigate and test the Nest’s electrical system to understand where the power is surging or why the thermostat thinks there’s an overcurrent problem.
n260
While this error code isn’t critical, it can still stop you from using the Nest thermostat like normal. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from obtaining adequate power. You can inspect the Nest’s C connector for the presence of a C wire and modify the wiring itself if there is. If not, you need a Nest Power Connector.
Due to installation of a Nest Power Connector, you might notice error code E297 appear. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector has already been installed, you’ll instead need 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 stemming from an overcurrent. If too much power is being delivered inside the Nest’s wiring, it may damage internal components and may even be a fire hazard. If you see this error code show up on your Nest thermostat and want to protect from electrical damage, it’s recommended to shut the power off as soon as you can. You can then get in touch with a professional technician with the proper experience diagnosing and fixing electrical problems.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This might be as simple as the breaker being turned off, but it may also be an issue with the wiring. After switching off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure they’re not loose or damaged. If nothing appears to be out of place, it’s time to speak with a local professional.
