Installing a Nest thermostat is one of the most convenient ways to optimize the day-to-day schedule of your HVAC system. This smart thermostat can recognize your preferences and automatically make improvements. But as you may expect, it won’t work correctly or at all if you see an error code on the display. The precise error code provides useful information about the underlying problem, something a knowledgeable technician can use to provide solutions that much sooner.
Let’s consider seven of the most likely 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 solve it and the estimated cost to do so. Remember that while the investment will ultimately hinge on the specific Nest model, you can anticipate paying between $75-$200 for repairs. This should include travel and labor costs on top of any specific parts necessary to complete repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and is displayed when the power is detached 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 display until the issue is resolved.
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 the electrical system. This may be the circuit breaker, fuse box or system switch. A certified technician can check electrical connections and wiring until they find 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, the technician will need to reconfigure the R wire. They’ll first perform a factory reset of your thermostat to ensure it’s not merely a software problem. 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 progressively look at each wire, seeing to it that they are fully inserted into the connector with the proper amount of exposed copper. Once they pinpoint the problem 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 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 check a handful of other places before calling a professional technician.
Since this error can drain your thermostat’s battery, the first step could be restoring enough power to determine if this specific error code is what you’re working with. You can disconnect the thermostat from its base and supply power by using a USB cable. Assuming it presents error code 195, you may continue to visually examine components including 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 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 getting more power than needed. This may stem from the breaker box, an error from the control board or because of a defective connection in the thermostat. The technician can meticulously investigate and test the Nest’s electrical system to understand where the power is surging or why the thermostat is convinced there’s an overcurrent problem.
n260
While this error code isn’t critical, it may still prevent you from using the Nest thermostat like normal. Error code n260 refers to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from getting enough 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 can get a Nest Power Connector.
Due to installation of a Nest Power Connector, you will sometimes notice error code E297 show up. This can be resolved 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
Similar to error code e103, e104 is a critical error that’s the result of an overcurrent. If excessive power is transported inside the Nest’s wiring, it may damage internal components and could even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to take steps to prevent electrical damage, it’s recommended to switch the power off as soon as possible. You can then contact a professional technician with the necessary experience identifying and fixing electrical malfunctions.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power.
This could be as easy as the breaker being shut off, but it can 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 they’re not loose or damaged. If nothing appears to be out of place, it’s time to speak with a local professional.