Here's What These 7 Nest Thermostat Error Codes Mean

Installing a Nest thermostat is one of the most convenient ways to perfect the day-to-day schedule of your HVAC system. This smart thermostat can learn your preferences and automatically make improvements. But as you might expect, it won’t work well or at all if you see an error code appear. The exact error code provides useful information about the underlying problem, something a knowledgeable technician can use to provide solutions that much sooner.

Here are seven of the most frequent error codes you may find on your Nest thermostat. We’ll explain the basics of each error code along with how you can address it and the approximate cost to do so. Don’t forget that while the costs will ultimately be dependent on the precise Nest model, you can expect to pay between $75-$200 for repairs. This should include things like travel and labor costs on top of any specific components required to complete repairs.

e298 – Critical

This critical error code is limited to new models of the Nest thermostat and appears when the power is shut off. Because 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 could have appeared further along in your electrical system. This could be the circuit breaker, fuse box or system switch. A certified technician can examine electrical connections and wiring until they uncover the root of the problem.

e294 – Critical

Critical error code e294 appears 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 make sure it’s not simply a software problem. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and begin checking connectors.

They’ll disconnect the power and progressively inspect each wire, seeing to it that they are fully attached into the connector with the correct amount of exposed copper. When they locate the damaged connector, it can be exchanged for a new one.

e195 – Critical

This critical error code can show up when the weather outside is especially hot. The HVAC system can shut down and stop sending power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will eventually power down. Assuming the breakers are on, you can inspect a couple of other places before contacting a professional technician.

As this error can consume your thermostat’s battery, the first step could be restoring enough power to figure out if this specific error code is what you’re working with. You can disconnect the thermostat from its base and supply power through a USB cable. If it presents error code 195, you can continue to visually inspect components like the wiring as well as your air conditioner’s air filter or drainage system. If you can’t uncover anything wrong with these components, it’s maybe best to contact a pro.

e103 – Critical

Another critical error code, e103 signifies an electrical error with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is experiencing more power than what is safe and normal. This can stem from the breaker box, an error from the control board or through a defective connection in the thermostat. The technician should cautiously 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.

n260

Although this error code isn’t critical, it can 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 the absence of 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 adjust the wiring itself if there is. If not, you’ll need a Nest Power Connector.

With installation of a Nest Power Connector, you will sometimes notice error code E297 show up. This can be resolved by updating your thermostat in Settings -> Software -> Update. If the Power Connector was already installed, you’ll instead have 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 sent inside the Nest’s wiring, it could damage internal components and may 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 a good idea to shut the power off as soon as possible. You can then get in touch with a professional technician with the proper experience diagnosing and solving electrical malfunctions.

e73 – Critical

When your thermostat displays error code e73, it means that the Rc wire is not getting power.

This might be as simple as the breaker being shut off, but it could also be something with the wiring. After turning off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure none of them are loose or damaged. If nothing looks to be out of place, it’s best to get in touch with a local professional.