Installing a Nest thermostat is one of the most convenient ways to optimize the everyday 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 well or at all if you see an error code appear. The precise error code supplies useful information about the source of the problem, something a trained technician can use to offer 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 along with how you could fix it and the estimated cost to do so. Remember that while the costs will ultimately hinge on the exact Nest model, you can anticipate paying between $75-$200 for repairs. This should include things like travel and labor costs on top of any specific components needed to finish 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. Because this is a critical power error, the thermostat will switch to the backup battery system. The error message will remain on the screen until the problem is fixed.
Losing power to your Nest thermostat can be for numerous reasons. The wiring might have disconnected or become damaged, or a disconnection may have happened further along in your home's electrical system. This may be the circuit breaker, fuse box or system switch. A certified technician should inspect electrical connections and wiring until they locate the source of the problem.
e294 - Critical
Critical error code e294 is displayed when your Nest thermostat’s wiring needs to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not merely a software problem. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and begin inspecting connectors.
They’ll shut off the power and slowly look at each wire, seeing to it that they are fully inserted into the connector with the proper amount of exposed copper. When they locate 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 severely hot. The HVAC system can fail and stop delivering power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat drains and the thermostat will eventually turn off. Presuming the breakers are on, you can check a handful of other places before contacting a professional technician.
Since this error can drain your thermostat’s battery, the first step may be restoring enough power to find out if this specific error code is what you’re working with. You can detach the thermostat from its base and deliver power with a USB cable. Assuming it displays error code 195, you should continue to visually check 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 call a pro.
e103 - Critical
Another critical error code, e103 suggests an electrical error with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is experiencing more power than what is safe and normal. This can stem from the breaker box, an error from the control board or through a faulty connection in the thermostat. Your technician will cautiously investigate and test the Nest’s electrical system to understand where the power is surging or why the thermostat thinks there’s an overcurrent problem.
Even though this error code isn’t critical, it might still keep you from using the Nest thermostat like normal. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from receiving 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 need a Nest Power Connector.
With installation of a Nest Power Connector, you will sometimes notice error code E297 appear. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector has already been installed, you’ll instead be required 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 stemming from an overcurrent. If excess power is being delivered using the Nest’s wiring, it may damage internal components and can even be a fire hazard. If you see this error code appear on your Nest thermostat and want to protect from electrical damage, it’s a good idea to turn the power off as soon as you can. You can then get in touch with a professional technician with the necessary experience diagnosing and fixing electrical issues.
e73 - Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power. This might be as straightforward as the breaker being shut off, but it could also be something 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 get in touch with a local professional.