Using a Nest thermostat is one of the easiest ways to perfect the daily 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 well or at all if you see an error code appear. The precise error code offers useful information about the root of the problem, something a knowledgeable technician can use to provide solutions that much faster.
Let’s consider seven of the most common error codes you may discover on your Nest thermostat. We’ll explain the basics of each error code on top of how you could solve it and the estimated cost to do so. Keep in mind that while the price will ultimately be dependent on the specific Nest model, you can anticipate paying around $75-$200 for repairs. This should also cover travel and labor costs as well as any specific components needed to wrap up repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and appears when the power is disconnected from the system. Because this is a critical power error, the thermostat will change to the backup battery system. The error message will continue to be displayed until the issue is fixed.
Losing power to your Nest thermostat can be for several reasons. The wiring could have disconnected or become damaged, or a disconnection could have happened further along in your home’s electrical system. This could 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 is displayed when your Nest thermostat’s wiring has to be reconfigured. More specifically, the technician will need to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not merely a software issue. If that doesn’t work, they’ll check the wiring diagram of the thermostat and start looking at connectors.
They’ll disconnect the power and slowly inspect each wire, making sure they are fully attached into the connector with the correct amount of bare copper. Once they locate the problem 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 shut down 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. Presuming the breakers are on, you can search a couple of other places before contacting a professional technician.
Because this error can deplete your thermostat’s battery, the first step could be restoring enough power to determine if this specific error code is what you’re working with. You can disconnect the thermostat from its base and deliver 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 can’t find anything wrong with these components, it will likely be best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical malfunction with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is receiving more power than necessary. This can stem from the breaker box, an error from the control board or thanks to a bad connection in the thermostat. The technician can carefully inspect and test the Nest’s electrical system to figure out 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 keep you from using the Nest thermostat like normal. Error code n260 refers to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from receiving adequate 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 can get a Nest Power Connector.
During installation of a Nest Power Connector, you might notice error code E297 be displayed. This can be resolved 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
Similar to error code e103, e104 is a critical error originating from an overcurrent. If excessive power is being delivered through the Nest’s wiring, it can damage internal components and may 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 suggested to turn the power off as soon as you can. You can then get in touch with a professional technician with the proper experience identifying and resolving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This could be as simple as the breaker being shut off, but it could also be an issue with the wiring. After turning 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 looks to be out of place, it’s best to get in touch with a local professional.