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 adjustments. But as you might expect, it won’t work properly or at all if you see an error code appear. The specific error code supplies useful information about the source of the problem, something a trained technician can use to present solutions that much sooner.
Here are seven of the most common error codes you might discover on your Nest thermostat. We’ll review the basics of each error code as well as how you can fix it and the projected cost to do so. Don’t forget that while the costs will ultimately hinge on the specific Nest model, you can anticipate paying about $75-$200 for repairs. This should include things like travel and labor costs as well as any specific parts necessary to wrap up repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and appears when the power is shut off. Since this is a critical power error, the thermostat will switch to the backup battery system. The error message will remain on display until the problem is dealt with.
Losing power to your Nest thermostat can be for numerous reasons. The wiring may have disconnected or become damaged, or a disconnection might have appeared further along in the electrical system. This might be the circuit breaker, fuse box or system switch. A trained technician should check electrical connections and wiring until they locate the root of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring has to be reconfigured. More specifically, you’ll need the technician 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 begin checking connectors.
They’ll detach the power and progressively look at each wire, seeing to it that they are fully attached into the connector with the proper amount of exposed copper. Once they locate the damaged connector, it can be replaced for a new one.
e195 – Critical
This critical error code can surface when the weather outside is particularly hot. The HVAC system can shut down and stop giving power to your Nest thermostat. When this problem persists, the backup battery in your thermostat drains and the thermostat will finally shut down. Presuming the breakers are on, you can search a few other places before contacting a professional technician.
Because this error can consume your thermostat’s battery, the first step could be providing enough power to determine if this specific error code is what you’re dealing with. You can disconnect the thermostat from its base and supply power by using a USB cable. In the event it reveals 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 don’t uncover anything wrong with these components, it will probably be best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical issue with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is receiving more power than what is safe and normal. This may stem from the breaker box, an error from the control board or because of a bad connection in the thermostat. A technician can meticulously investigate and test the Nest’s electrical system to understand where the power is surging or why the thermostat believes there’s an overcurrent problem.
Even though this error code isn’t critical, it can still stop you from using the Nest thermostat like normal. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from receiving sufficient power. You can examine 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.
During installation of a Nest Power Connector, you will sometimes notice error code E297 be displayed. This can be resolved by updating your thermostat in Settings -> Software -> Update. If the Power Connector was 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 too much power is being delivered through the Nest’s wiring, it could damage internal components and can even be a fire hazard. If you see this error code appear 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 in touch with a professional technician with the necessary experience detecting and fixing electrical malfunctions.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This could be as straightforward as the breaker being shut 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 time to contact a local professional.