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 improvements. But as you can expect, it won’t work well or at all if you see an error code show up. The exact error code supplies useful information about the root of the problem, something a knowledgeable technician can use to offer solutions that much faster.
Let’s consider seven of the most frequent error codes you could find on your Nest thermostat. We’ll review the basics of each error code on top of how you could fix it and the estimated cost to do so. Keep in mind that while the price will ultimately hinge on the exact Nest model, you can expect to pay about $75-$200 for repairs. This should also cover travel and labor costs on top of any specific parts required to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and is displayed when the power is disconnected from the system. As this is a critical power error, the thermostat will change to the backup battery system. The error message will remain on the screen until the issue is resolved.
Losing power to your Nest thermostat can be for a number of reasons. The wiring could have disconnected or become damaged, or a disconnection might have appeared further along in your home’s electrical system. This might be the circuit breaker, fuse box or system switch. A knowledgeable technician can inspect electrical connections and wiring until they uncover the source of the problem.
e294 – Critical
Critical error code e294 shows up when your Nest thermostat’s wiring needs to be reconfigured. More specifically, you’ll need the technician to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not just a software error. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start looking at connectors.
They’ll detach the power and progressively check each wire, making sure they are fully inserted into the connector with the proper amount of bare copper. Once 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 particularly hot. The HVAC system can shut down and stop delivering power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat drains and the thermostat will subsequently shut down. Presuming the breakers are on, you can check a few other places before calling a professional technician.
Since this error can deplete your thermostat’s battery, the first step could be providing enough power to find out if this specific error code is what you’re dealing with. You can detach the thermostat from its base and provide power with a USB cable. Assuming it presents error code 195, you may continue to visually inspect components including the wiring as well as your air conditioner’s air filter or drainage system. If you can’t uncover anything wrong with these components, it will probably be best to contact a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical error with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is receiving more power than needed. This will sometimes stem from the breaker box, an error from the control board or through a defective connection in the thermostat. Your technician should cautiously examine 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
Even though this error code isn’t critical, it can still keep you from using the Nest thermostat how you prefer to. Error code n260 refers to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from receiving enough power. You can examine the Nest’s C connector for the presence of a C wire and adapt the wiring itself if there is. If not, you can get a Nest Power Connector.
Due to 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 was already installed, you’ll instead be required 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 stemming from an overcurrent. If too much power is sent using the Nest’s wiring, it can damage internal components and may even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s recommended to turn the power off straightaway. You can then contact a professional technician with the necessary experience diagnosing and resolving electrical damage.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This could be as easy as the breaker being switched off, but it could also be something with the wiring. After switching off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure nothing is loose or damaged. If nothing appears to be out of place, it’s best to get in touch with a local professional.