Using a Nest thermostat is one of the best ways to perfect the daily schedule of your comfort system. This smart thermostat can be taught your preferences and automatically make improvements. But as you can expect, it won’t work correctly or at all if you see an error code show up. The precise error code provides useful information about the underlying problem, something a trained technician can use to provide solutions that much quicker.
Let’s consider seven of the most common error codes you may encounter on your Nest thermostat. We’ll review the basics of each error code as well as how you might address it and the projected cost to do so. Keep in mind that while the costs will ultimately hinge on the exact Nest model, you can expect to pay about $75-$200 for repairs. This should include travel and labor costs on top of any specific components required to complete repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and shows up when the power is detached from the system. Because 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 problem is dealt with.
Losing power to your Nest thermostat can be for numerous reasons. The wiring might have disconnected or become damaged, or a disconnection might have occurred further along in your electrical system. This might be the circuit breaker, fuse box or system switch. A knowledgeable technician should check electrical connections and wiring until they locate 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, the technician will need to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not just a software issue. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and begin looking at connectors.
They’ll detach the power and progressively check each wire, ensuring they are fully inserted into the connector with the proper amount of bare copper. Once they find the problem connector, it can be replaced 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 delivering power to your Nest thermostat. When this problem persists, the backup battery in your thermostat depletes and the thermostat will eventually power down. Presuming the breakers are on, you can examine a couple of other places before contacting a professional technician.
Since this error can deplete your thermostat’s battery, the first step may be supplying enough power to find out if this specific error code is what you’re working with. You can separate the thermostat from its base and deliver power by using a USB cable. If it presents error code 195, you may continue to visually examine components such as the wiring as well as your air conditioner’s air filter or drainage system. If you don’t find anything wrong with these components, it will probably be best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical issue with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is experiencing more power than needed. This can stem from the breaker box, an error from the control board or because of a faulty connection in the thermostat. Your technician needs to cautiously investigate and test the Nest’s electrical system to determine 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 may still stop you from using the Nest thermostat how you want to. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from receiving adequate power. You can inspect 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 may notice error code E297 show up. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead need 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 sent inside the Nest’s wiring, it can damage internal components and can even be a fire hazard. If you see this error code show up on your Nest thermostat and want to take steps to prevent electrical damage, it’s recommended to shut the power off as soon as you can. You can then get in touch with a professional technician with the appropriate experience identifying and solving electrical damage.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not receiving power.
This might be as easy as the breaker being turned off, but it can also be something with the wiring. After turning off the power to your HVAC system and thermostat, you can visually examine the wires to make sure nothing is loose or damaged. If nothing appears to be out of place, it’s best to speak with a local professional.