Using a Nest thermostat is one of the easiest ways to improve the daily schedule of your comfort system. This smart thermostat can recognize your preferences and automatically make adjustments. But as you may expect, it won’t work properly or at all if you see an error code on the display. The precise error code supplies useful information about the source of the problem, something a knowledgeable technician can use to present solutions that much quicker.
Here are seven of the most likely error codes you may encounter on your Nest thermostat. We’ll review the basics of each error code as well as how you could solve it and the projected cost to do so. Keep in mind that while the costs will ultimately hinge on the precise Nest model, you can count on paying around $75-$200 for repairs. This should include things like travel and labor costs on top of any specific components needed to complete repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and is displayed when the power is disconnected from the system. Because this is a critical power error, the thermostat will swap to the backup battery system. The error message will remain on the screen until the issue is fixed.
Losing power to your Nest thermostat can be for numerous reasons. The wiring might have disconnected or become damaged, or a disconnection could have appeared further along in your home’s electrical system. This could be the circuit breaker, fuse box or system switch. A professional technician should check electrical connections and wiring until they find the root of the problem.
e294 – Critical
Critical error code e294 is displayed when your Nest thermostat’s wiring should 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 just a software problem. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start inspecting connectors.
They’ll shut off the power and gradually inspect each wire, making sure they are fully attached into the connector with the correct amount of bare copper. After they pinpoint the problem connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can show up when the weather outside is particularly hot. The HVAC system can shut down and stop sending power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat depletes and the thermostat will subsequently power down. Presuming the breakers are on, you can examine a couple of other places before contacting a professional technician.
As this error can drain your thermostat’s battery, the first step could be providing 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 provide power through a USB cable. In the event it presents 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 struggle to find anything wrong with these components, it will likely be best to contact a pro.
e103 – Critical
Another critical error code, e103 indicates an electrical malfunction with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is receiving more power than necessary. This can stem from the breaker box, an error from the control board or through a faulty connection in the thermostat. Your technician should carefully examine and test the Nest’s electrical system to figure out 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 keep you from using the Nest thermostat how you prefer to. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from getting 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 need a Nest Power Connector.
With installation of a Nest Power Connector, you might notice error code E297 appear. This can be dealt with 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 excessive power is transported inside the Nest’s wiring, it can damage internal components and could even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to guard against electrical damage, it’s recommended to switch the power off as soon as possible. You can then get a hold of a professional technician with the proper experience diagnosing and resolving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This could be as easy as the breaker being shut off, but it could also be an issue with the wiring. After turning 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 appears to be out of place, it’s best to speak with a local professional.