Using a Nest thermostat is one of the best ways to optimize the daily schedule of your heating and cooling. This smart thermostat can be taught your preferences and automatically make adjustments. But as you might expect, it won’t work well or at all if you see an error code appear. The precise error code offers useful information about the source of the problem, something a trained technician can use to provide solutions that much sooner.
Here are seven of the most likely error codes you could discover on your Nest thermostat. We’ll review the basics of each error code as well as how you could address it and the estimated cost to do so. Don’t forget that while the price will ultimately hinge on the exact Nest model, you can expect to pay between $75-$200 for repairs. This should include travel and labor costs as well as any specific parts necessary to wrap up repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and shows up when the power is shut off. Because this is a critical power error, the thermostat will swap to the backup battery system. The error message will continue to be displayed until the problem is resolved.
Losing power to your Nest thermostat can be for several reasons. The wiring could have disconnected or become damaged, or a disconnection could have occurred further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A professional technician can examine electrical connections and wiring until they uncover the source 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 will need to reconfigure the R wire. They’ll first perform a factory reset of your thermostat to make sure it’s not merely a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start looking at connectors.
They’ll detach the power and slowly inspect each wire, seeing to it that they are fully attached into the connector with the correct amount of bare copper. When they locate the malfunctioning connector, it can be replaced for a new one.
e195 – Critical
This critical error code can surface when the weather outside is especially hot. The HVAC system can fail and stop delivering power to your Nest thermostat. When this problem persists, the backup battery in your thermostat drains and the thermostat will subsequently power down. In the event the breakers are on, you can examine a handful of other places before contacting a professional technician.
As this error can consume your thermostat’s battery, the first step could be supplying enough power to find out if this specific error code is what you’re facing. You can separate the thermostat from its base and deliver power by using a USB cable. Assuming it reveals error code 195, you may continue to visually inspect components like 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 probably be best to call a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical malfunction with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is experiencing more power than necessary. This can stem from the breaker box, an error from the control board or through a defective connection in the thermostat. The technician needs to meticulously 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.
n260
Even though this error code isn’t critical, it might 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 missing one can block your Nest from obtaining adequate 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’ll need a Nest Power Connector.
Due to installation of a Nest Power Connector, you will sometimes notice error code E297 appear. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead be required 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 excess power is being delivered using the Nest’s wiring, it can damage internal components and could even be a fire hazard. If you see this error code appear on your Nest thermostat and want to guard against electrical damage, it’s recommended to shut the power off as soon as possible. You can then get a hold of a professional technician with the necessary experience diagnosing and fixing electrical issues.
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 switched off, but it could also be an issue with the wiring. After shutting 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 looks to be out of place, it’s a good idea to get in touch with a local professional.