Operating a Nest thermostat is one of the best ways to perfect the everyday schedule of your comfort system. This smart thermostat can learn your preferences and automatically make changes. But as you can expect, it won’t work correctly or at all if you see an error code on the display. The exact error code supplies useful information about the root of the problem, something a professional technician can use to offer solutions that much sooner.
Here are seven of the most frequent error codes you might discover on your Nest thermostat. We’ll review the basics of each error code as well as 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 precise Nest model, you can count on paying between $75-$200 for repairs. This should also cover travel and labor costs along with any specific parts necessary to wrap up repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and is displayed when the power is shut off. Because this is a critical power error, the thermostat will switch to the backup battery system. The error message will continue to be displayed until the issue 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 may have appeared further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A professional technician will check electrical connections and wiring until they uncover the root of the problem.
e294 – Critical
Critical error code e294 shows up when your Nest thermostat’s wiring has to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to ensure it’s not just a software problem. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and begin inspecting connectors.
They’ll disconnect the power and gradually check each wire, ensuring they are fully placed into the connector with the proper amount of bare copper. After they locate the problem connector, it can be swapped for a new one.
e195 – Critical
This critical error code can show up when the weather outside is severely 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 drains and the thermostat will eventually power down. In the event the breakers are on, you can search a few other places before consulting a professional technician.
Since this error can drain your thermostat’s battery, the first step might be providing enough power to determine if this specific error code is what you’re dealing with. You can separate the thermostat from its base and provide power through a USB cable. In the event it presents 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 can’t find anything wrong with these components, it will probably be best to contact a pro.
e103 – Critical
Another critical error code, e103 indicates an electrical issue with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is getting 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. A technician will 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.
n260
Even though this error code isn’t critical, it might still keep you from using the Nest thermostat how you want to. Error code n260 refers to the lack of a C wire or Nest Power Connector, as the absence of one can block your Nest from obtaining sufficient power. You can inspect the Nest’s C connector for the presence of a C wire and adapt 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 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 through the Nest’s wiring, it may damage internal components and can even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to protect from electrical damage, it’s a good idea to shut the power off as soon as possible. You can then contact a professional technician with the appropriate experience identifying and resolving electrical problems.
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 switched off, but it could also be a problem with the wiring. After switching off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure none of them are loose or damaged. If nothing seems to be out of place, it’s time to speak with a local professional.
