Using a Nest thermostat is one of the most convenient ways to improve the everyday 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 well or at all if you see an error code appear. The specific error code provides useful information about the underlying problem, something a knowledgeable technician can use to provide solutions that much faster.
Listed below are seven of the most frequent error codes you may encounter on your Nest thermostat. We’ll walk you through the basics of each error code along with how you might fix it and the estimated cost to do so. Keep in mind that while the costs will ultimately hinge on the specific Nest model, you can expect to pay around $75-$200 for repairs. This should include things like travel and labor costs along with any specific hardware required to complete 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 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 a number of reasons. The wiring could have disconnected or become damaged, or a disconnection could have appeared further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A knowledgeable technician should check electrical connections and wiring until they locate 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 will need to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to make sure it’s not merely a software problem. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start inspecting connectors.
They’ll disconnect the power and gradually inspect each wire, ensuring they are fully placed into the connector with the proper amount of exposed copper. When they find the malfunctioning connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can surface when the weather outside is severely hot. The HVAC system can fail and stop delivering power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat depletes and the thermostat will subsequently turn off. Assuming the breakers are on, you can inspect a few other places before consulting a professional technician.
As this error can consume your thermostat’s battery, the first step may be restoring enough power to figure out if this specific error code is what you’re facing. You can detach the thermostat from its base and provide power by using a USB cable. In the event it reveals 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 struggle to find anything wrong with these components, it will probably be best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 indicates an electrical error with your Nest thermostat. More specifically, e103 can 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 can 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.
n260
Even though 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 not having one can block your Nest from getting enough 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 be displayed. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already 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 excessive power is sent through the Nest’s wiring, it could damage internal components and can even be a fire hazard. If you notice this error code show up on your Nest thermostat and want to take steps to prevent electrical damage, it’s suggested to shut the power off straightaway. You can then get a hold of a professional technician with the proper experience detecting and solving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not receiving power.
This could be as easy as the breaker being shut off, but it can also be something with the wiring. After switching off the power to your HVAC system and thermostat, you can visually examine the wires to make sure none of them are loose or damaged. If nothing appears to be out of place, it’s time to contact a local professional.