Using a Nest thermostat is one of the most convenient ways to improve the daily schedule of your comfort system. This smart thermostat can learn your preferences and automatically make adjustments. But as you may expect, it won’t work correctly or at all if you see an error code show up. The precise error code supplies useful information about the source of the problem, something a professional technician can use to provide solutions that much quicker.
Here are seven of the most likely error codes you may encounter on your Nest thermostat. We’ll walk you through the basics of each error code as well as how you might address it and the approximate cost to do so. Remember that while the costs will ultimately be dependent on the specific Nest model, you can anticipate paying around $75-$200 for repairs. This should also cover travel and labor costs as well as any specific parts necessary to complete repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and appears when the power is detached from the system. Since this is a critical power error, the thermostat will change to the backup battery system. The error message will remain on display until the problem is resolved.
Losing power to your Nest thermostat can be for a number of reasons. The wiring might have disconnected or become damaged, or a disconnection could have occurred further along in your home’s electrical system. This may be the circuit breaker, fuse box or system switch. A professional technician will examine electrical connections and wiring until they uncover the root 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 ensure it’s not simply a software error. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start inspecting connectors.
They’ll disconnect the power and progressively inspect each wire, making sure they are fully placed into the connector with the proper amount of uncovered copper. When they find the damaged 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 lingers, the backup battery in your thermostat drains and the thermostat will subsequently power down. Presuming the breakers are on, you can examine a couple of other places before consulting a professional technician.
As this error can drain your thermostat’s battery, the first step may be supplying enough power to figure out if this specific error code is what you’re working with. You can disconnect the thermostat from its base and deliver power with a USB cable. Assuming it reveals error code 195, you can continue to visually inspect components including 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 likely 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 experiencing more power than what is safe and normal. This will sometimes stem from the breaker box, an error from the control board or through a bad connection in the thermostat. The technician can cautiously 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.
n260
Even though this error code isn’t critical, it could still stop you from using the Nest thermostat like normal. Error code n260 concerns the lack of a C wire or Nest Power Connector, as the absence of one can block your Nest from getting sufficient power. You can check the Nest’s C connector for the presence of a C wire and adjust the wiring itself if there is. If not, you’ll need a Nest Power Connector.
With installation of a Nest Power Connector, you will sometimes notice error code E297 show up. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead have 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 excessive power is sent through the Nest’s wiring, it may 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 suggested to shut the power off straightaway. You can then get in touch with a professional technician with the appropriate experience identifying and solving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not getting power.
This could be as easy as the breaker being shut off, but it could also be a problem with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure none of them are loose or damaged. If nothing looks to be out of place, it’s time to speak with a local professional.