Operating a Nest thermostat is one of the easiest ways to perfect the everyday schedule of your comfort system. This smart thermostat can recognize your preferences and automatically make changes. But as you might expect, it won’t work well or at all if you see an error code show up. The specific error code offers useful information about the underlying problem, something a knowledgeable technician can use to present solutions that much faster.
Here are seven of the most common error codes you may find on your Nest thermostat. We’ll explain the basics of each error code on top of how you might address it and the approximate cost to do so. Remember that while the price will ultimately depend on the exact Nest model, you can count on paying between $75-$200 for repairs. This should also cover 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 detached from the system. Because this is a critical power error, the thermostat will change to the backup battery system. The error message will remain on display until the problem is fixed.
Losing power to your Nest thermostat can be for a number of reasons. The wiring could have disconnected or become damaged, or a disconnection might have happened further along in the electrical system. This may 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 shows up 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 ensure it’s not just 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, making sure they are fully placed into the connector with the proper amount of exposed copper. After they pinpoint 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 fail and stop delivering power to your Nest thermostat. When this problem persists, the backup battery in your thermostat drains and the thermostat will finally power down. Assuming the breakers are on, you can inspect a few other places before consulting a professional technician.
Since 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 provide power with a USB cable. Assuming it displays error code 195, you can continue to visually inspect components including the wiring as well as your air conditioner’s air filter or drainage system. If you can’t detect anything wrong with these components, it will probably be best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical malfunction with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is experiencing more power than needed. This will sometimes stem from the breaker box, an error from the control board or through a defective connection in the thermostat. The technician should meticulously investigate 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.
Although this error code isn’t critical, it may still stop you from using the Nest thermostat how you want to. Error code n260 pertains 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 adapt the wiring itself if there is. If not, you’ll need a Nest Power Connector.
During installation of a Nest Power Connector, you might notice error code E297 be displayed. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead need 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 originating from an overcurrent. If excess power is transported using 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 guard against electrical damage, it’s suggested to switch the power off as soon as possible. You can then get in touch with a professional technician with the necessary experience identifying and resolving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This will sometimes be as simple as the breaker being switched off, but it may also be something with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually check the wires to make sure none of them are loose or damaged. If nothing appears to be out of place, it’s time to speak with a local professional.