Operating 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 may 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 underlying problem, something a trained technician can use to present solutions that much sooner.
Listed below are seven of the most likely error codes you may find on your Nest thermostat. We’ll explain the basics of each error code along with how you could fix it and the projected cost to do so. Keep in mind that while the costs will ultimately be dependent on the exact Nest model, you can count on paying around $75-$200 for repairs. This should include travel and labor costs as well as any specific parts necessary to wrap up repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and is displayed when the power is shut off. As this is a critical power error, the thermostat will switch to the backup battery system. The error message will remain on display until the issue is resolved.
Losing power to your Nest thermostat can be for several reasons. The wiring might have disconnected or become damaged, or a disconnection may have happened further along in your home’s electrical system. This might be the circuit breaker, fuse box or system switch. A trained technician will check electrical connections and wiring until they locate the root 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 merely a software problem. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin checking connectors.
They’ll shut off the power and progressively look at each wire, ensuring they are fully attached into the connector with the correct amount of bare copper. After they pinpoint the problem connector, it can be swapped for a new one.
e195 – Critical
This critical error code can surface when the weather outside is especially 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 subsequently power down. Assuming the breakers are on, you can check a handful of other places before consulting a professional technician.
Because this error can drain your thermostat’s battery, the first step may be restoring enough power to determine if this specific error code is what you’re facing. You can detach the thermostat from its base and supply power through a USB cable. Assuming it reveals error code 195, you should continue to visually inspect components including the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to uncover anything wrong with these components, it’s maybe best to call a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical malfunction with your Nest thermostat. More specifically, e103 will 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 through a faulty connection in the thermostat. Your technician needs to meticulously inspect and test the Nest’s electrical system to understand where the power is surging or why the thermostat thinks there’s an overcurrent problem.
n260
Although this error code isn’t critical, it can still keep you from using the Nest thermostat like normal. Error code n260 concerns the lack of a C wire or Nest Power Connector, as missing 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 modify the wiring itself if there is. If not, you’ll need a Nest Power Connector.
With installation of a Nest Power Connector, you might notice error code E297 be displayed. This can be resolved 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
Just like error code e103, e104 is a critical error stemming from an overcurrent. If excessive power is sent through the Nest’s wiring, it may damage internal components and can even be a fire hazard. If you notice this error code show up on your Nest thermostat and want to take steps to prevent electrical damage, it’s a good idea to switch the power off as soon as possible. You can then contact a professional technician with the necessary experience detecting and resolving electrical damage.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This may be as simple as the breaker being turned off, but it could also be an issue with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually examine the wires to make sure they’re not loose or damaged. If nothing looks to be out of place, it’s time to contact a local professional.