Using a Nest thermostat is one of the best ways to perfect the daily 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 exact error code offers 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 likely error codes you may encounter on your Nest thermostat. We’ll review the basics of each error code on top of how you might solve it and the estimated cost to do so. Remember that while the costs will ultimately hinge on the precise Nest model, you can count on paying about $75-$200 for repairs. This should also cover travel and labor costs on top of any specific components necessary to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and is displayed when the power is detached from the system. Because this is a critical power error, the thermostat will switch to the backup battery system. The error message will remain on display until the problem is dealt with.
Losing power to your Nest thermostat can be for a number of reasons. The wiring could have disconnected or become damaged, or a disconnection may have happened further along in your home’s electrical system. This could be the circuit breaker, fuse box or system switch. A professional technician will inspect 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, you’ll need the technician to reconfigure the R wire. They’ll first perform a factory reset of your thermostat to ensure it’s not simply a software issue. If that doesn’t work, they’ll check 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 attached into the connector with the correct amount of bare copper. Once they locate the damaged connector, it can be replaced for a new one.
e195 – Critical
This critical error code can appear when the weather outside is particularly hot. The HVAC system can shut down and stop delivering power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will finally turn off. In the event the breakers are on, you can search a few other places before calling a professional technician.
As this error can consume your thermostat’s battery, the first step may be supplying enough power to determine if this specific error code is what you’re dealing with. You can detach the thermostat from its base and deliver power through a USB cable. If it presents error code 195, you can continue to visually examine 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 signifies an electrical problem with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is experiencing more power than needed. This may stem from the breaker box, an error from the control board or because of a defective connection in the thermostat. Your technician should cautiously investigate 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.
Even though this error code isn’t critical, it could still prevent you from using the Nest thermostat how you prefer to. Error code n260 refers to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from obtaining sufficient power. You can examine 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.
With installation of a Nest Power Connector, you might notice error code E297 appear. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector was 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 that’s the result of an overcurrent. If too much power is transported inside the Nest’s wiring, it may damage internal components and may even be a fire hazard. If you see this error code pop up on your Nest thermostat and want to protect from electrical damage, it’s recommended to switch the power off as soon as you can. You can then get in touch with a professional technician with the proper experience diagnosing and solving electrical damage.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This might be as straightforward as the breaker being switched off, but it could also be something with the wiring. After shutting 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 looks to be out of place, it’s a good idea to get in touch with a local professional.