Installing a Nest thermostat is one of the best ways to optimize the day-to-day schedule of your heating and cooling. This smart thermostat can be taught your preferences and automatically make improvements. But as you might expect, it won’t work correctly or at all if you see an error code show up. The exact error code supplies useful information about the source of the problem, something a professional technician can use to present solutions that much quicker.
Here are seven of the most common error codes you may find on your Nest thermostat. We’ll review the basics of each error code on top of how you can solve it and the approximate cost to do so. Keep in mind that while the price will ultimately hinge on the specific Nest model, you can anticipate paying around $75-$200 for repairs. This should include travel and labor costs on top of any specific parts required to finish repairs.
e298 - Critical
This critical error code is limited to new models of the Nest thermostat and shows up when the power is disconnected from the system. Since this is a critical power error, the thermostat will switch 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 could have disconnected or become damaged, or a disconnection might have happened further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A knowledgeable technician should examine electrical connections and wiring until they find the root of the problem.
e294 - Critical
Critical error code e294 is displayed when your Nest thermostat’s wiring should be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first perform 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 inspecting connectors.
They’ll shut off the power and progressively check each wire, making sure they are fully placed into the connector with the correct amount of uncovered copper. When they locate the malfunctioning connector, it can be exchanged for a new one.
e195 - Critical
This critical error code can appear when the weather outside is particularly hot. The HVAC system can break down and stop delivering power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will eventually turn off. In the event the breakers are on, you can check a couple of other places before contacting a professional technician.
As this error can drain your thermostat’s battery, the first step could be providing enough power to find out if this specific error code is what you’re dealing with. You can disconnect the thermostat from its base and supply power with a USB cable. In the event it displays error code 195, you may 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 likely be best to call a pro.
e103 - Critical
Another critical error code, e103 signifies an electrical problem with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is getting more power than what is safe and normal. This will sometimes stem from the breaker box, an error from the control board or through a bad connection in the thermostat. The technician should meticulously examine and test the Nest’s electrical system to determine where the power is surging or why the thermostat is convinced there’s an overcurrent problem.
While this error code isn’t critical, it may still stop you from using the Nest thermostat how you prefer to. Error code n260 concerns the lack of a C wire or Nest Power Connector, as not having one can block your Nest from receiving enough power. You can inspect 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.
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 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 excess 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 appear on your Nest thermostat and want to protect from electrical damage, it’s a good idea to turn the power off straightaway. You can then get in touch with a professional technician with the necessary experience detecting and solving electrical malfunctions.
e73 - Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not getting power. This could 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 check the wires to make sure they’re not loose or damaged. If nothing appears to be out of place, it’s time to speak with a local professional.