Using a Nest thermostat is one of the best ways to optimize the day-to-day schedule of your heating and cooling. This smart thermostat can recognize your preferences and automatically make improvements. But as you can expect, it won’t work properly or at all if you see an error code show up. The specific error code offers useful information about the source of the problem, something a knowledgeable technician can use to present solutions that much faster.
Here are seven of the most common error codes you could find on your Nest thermostat. We’ll walk you through the basics of each error code along with how you could address it and the projected cost to do so. Remember that while the costs will ultimately depend on the specific Nest model, you can anticipate paying about $75-$200 for repairs. This should include things like travel and labor costs as well as any specific hardware required to complete repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and shows up when the power is disconnected from the system. As this is a critical power error, the thermostat will swap to the backup battery system. The error message will remain on display until the issue is dealt with.
Losing power to your Nest thermostat can be for numerous reasons. The wiring may have disconnected or become damaged, or a disconnection may have happened further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A certified technician can check electrical connections and wiring until they uncover the source of the problem.
e294 – Critical
Critical error code e294 is displayed when your Nest thermostat’s wiring has to be reconfigured. More specifically, you’ll need the technician to reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to make sure it’s not just a software problem. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin looking at connectors.
They’ll detach the power and slowly check each wire, ensuring they are fully inserted into the connector with the correct amount of exposed copper. After they pinpoint the malfunctioning connector, it can be swapped for a new one.
e195 – Critical
This critical error code can surface when the weather outside is especially hot. The HVAC system can shut down and stop giving power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat depletes and the thermostat will eventually turn off. Assuming the breakers are on, you can inspect a handful of other places before consulting a professional technician.
Because this error can drain your thermostat’s battery, the first step could be supplying enough power to determine if this specific error code is what you’re facing. You can disconnect the thermostat from its base and deliver power by using a USB cable. Assuming it displays error code 195, you should continue to visually examine components like the wiring as well as your air conditioner’s air filter or drainage system. If you don’t detect 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 can stem from the breaker box, an error from the control board or thanks to a bad connection in the thermostat. A technician can meticulously examine and test the Nest’s electrical system to determine where the power is surging or why the thermostat believes there’s an overcurrent problem.
Although this error code isn’t critical, it can still stop you from using the Nest thermostat how you want to. Error code n260 concerns the lack of a C wire or Nest Power Connector, as missing 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 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 show up. This can be resolved by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead need 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 that’s the result of an overcurrent. If excess power is being delivered using the Nest’s wiring, it could damage internal components and may even be a fire hazard. If you notice this error code show up on your Nest thermostat and want to guard against electrical damage, it’s recommended to shut the power off as soon as you can. You can then contact a professional technician with the appropriate experience identifying and resolving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power.
This might be as easy 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 check the wires to make sure they’re not loose or damaged. If nothing looks to be out of place, it’s best to get in touch with a local professional.