Using a Nest thermostat is one of the most convenient ways to improve the everyday schedule of your comfort system. This smart thermostat can recognize your preferences and automatically make adjustments. But as you can expect, it won’t work properly or at all if you see an error code appear. The exact error code offers useful information about the underlying problem, something a trained technician can use to offer solutions that much faster.
Let’s consider seven of the most frequent error codes you could encounter on your Nest thermostat. We’ll review the basics of each error code on top of how you could solve it and the approximate cost to do so. Remember that while the investment will ultimately hinge on the specific Nest model, you can expect to pay about $75-$200 for repairs. This should also cover travel and labor costs along with any specific components necessary to wrap up repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and shows up when the power is shut off. As this is a critical power error, the thermostat will swap to the backup battery system. The error message will remain on the screen until the issue 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 occurred further along in the electrical system. This could be the circuit breaker, fuse box or system switch. A trained technician should examine 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 make sure it’s not merely a software issue. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and begin checking connectors.
They’ll disconnect the power and gradually check each wire, seeing to it that they are fully placed into the connector with the correct amount of uncovered copper. When they locate the problem 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 sending power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will finally turn off. Assuming the breakers are on, you can inspect a handful of other places before consulting a professional technician.
Because this error can deplete your thermostat’s battery, the first step might be supplying enough power to determine if this specific error code is what you’re working with. You can disconnect the thermostat from its base and deliver power with a USB cable. If 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 don’t find anything wrong with these components, it’s maybe best to call a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical issue with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is experiencing more power than necessary. This will sometimes stem from the breaker box, an error from the control board or thanks to a bad connection in the thermostat. Your technician needs to meticulously 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 may still prevent you from using the Nest thermostat like normal. Error code n260 concerns the lack of a C wire or Nest Power Connector, as not having one can block your Nest from obtaining 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’ll need a Nest Power Connector.
With installation of a Nest Power Connector, you may notice error code E297 show up. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector was already installed, you’ll instead have 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 too much power is being delivered inside the Nest’s wiring, it may damage internal components and may even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to take steps to prevent electrical damage, it’s recommended to turn the power off as soon as possible. You can then get in touch with a professional technician with the proper experience detecting and resolving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not receiving power.
This will sometimes be as simple as the breaker being turned off, but it can also be an issue with the wiring. After switching off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure they’re not loose or damaged. If nothing appears to be out of place, it’s time to contact a local professional.
