Using a Nest thermostat is one of the most convenient ways to optimize the daily schedule of your heating and cooling. 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 exact error code provides useful information about the root of the problem, something a professional technician can use to offer solutions that much faster.
Let’s consider seven of the most likely error codes you might discover on your Nest thermostat. We’ll review the basics of each error code along with how you could fix it and the estimated cost to do so. Remember that while the price will ultimately hinge on the precise Nest model, you can count on paying about $75-$200 for repairs. This should include travel and labor costs on top of any specific hardware needed to finish repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and is displayed when the power is detached from the system. Since 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 numerous reasons. The wiring might have disconnected or become damaged, or a disconnection might have occurred further along in your electrical system. This could be the circuit breaker, fuse box or system switch. A knowledgeable technician should inspect 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 should 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 simply a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin inspecting connectors.
They’ll disconnect the power and progressively inspect each wire, ensuring they are fully attached into the connector with the correct amount of exposed copper. Once they locate the malfunctioning connector, it can be replaced for a new one.
e195 – Critical
This critical error code can appear when the weather outside is particularly hot. The HVAC system can shut down and stop delivering power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat drains and the thermostat will eventually turn off. Presuming the breakers are on, you can check a couple of other places before consulting a professional technician.
As this error can deplete your thermostat’s battery, the first step could be supplying enough power to figure out if this specific error code is what you’re facing. You can separate the thermostat from its base and supply power with a USB cable. Assuming it presents error code 195, you may continue to visually check components such as 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 likely be best to call a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical issue with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is getting more power than needed. This can stem from the breaker box, an error from the control board or because of a bad connection in the thermostat. The technician can cautiously 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.
Although this error code isn’t critical, it might still stop 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 missing one can block your Nest from obtaining sufficient power. You can check 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.
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 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 that’s the result of an overcurrent. If too much power is sent inside the Nest’s wiring, it could 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 protect from electrical damage, it’s suggested to switch the power off straightaway. You can then get in touch with a professional technician with the appropriate experience identifying and resolving electrical malfunctions.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This may be as simple as the breaker being switched off, but it can also be a problem with the wiring. After switching 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 seems to be out of place, it’s time to get in touch with a local professional.