Here's What These 7 Nest Thermostat Error Codes Mean

Operating a Nest thermostat is one of the best ways to improve the daily schedule of your HVAC system. This smart thermostat can learn 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 exact error code supplies useful information about the root of the problem, something a professional technician can use to offer solutions that much sooner.

Listed below are seven of the most common error codes you might encounter on your Nest thermostat. We’ll review the basics of each error code along with how you could solve it and the estimated cost to do so. Keep in mind that while the price will ultimately hinge on the precise Nest model, you can expect to pay between $75-$200 for repairs. This should include travel and labor costs as well as any specific components required to complete repairs.

e298 – Critical

This critical error code is limited to the latest models of the Nest thermostat and shows up when the power is shut off. As this is a critical power error, the thermostat will swap to the backup battery system. The error message will remain on display until the problem is resolved.

Losing power to your Nest thermostat can be for several reasons. The wiring could have disconnected or become damaged, or a disconnection may have appeared further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A trained technician should examine 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 should be reconfigured. More specifically, the technician will need to reconfigure the R wire. They’ll first perform a factory reset of your thermostat to make sure it’s not just a software issue. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start inspecting connectors.

They’ll shut off the power and gradually inspect each wire, making sure they are fully placed into the connector with the proper amount of bare copper. After they locate the damaged connector, it can be exchanged for a new one.

e195 – Critical

This critical error code can appear when the weather outside is particularly hot. The HVAC system can break down and stop sending power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will finally power down. In the event the breakers are on, you can examine a couple of other places before consulting a professional technician.

Since this error can consume your thermostat’s battery, the first step may be providing enough power to determine if this specific error code is what you’re working with. You can separate the thermostat from its base and supply power through a USB cable. Assuming it presents 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’s maybe best to get in touch with a pro.

e103 – Critical

Another critical error code, e103 signifies an electrical issue with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is receiving more power than needed. This will sometimes stem from the breaker box, an error from the control board or through a faulty connection in the thermostat. Your technician will meticulously examine 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

Even though this error code isn’t critical, it might still prevent you from using the Nest thermostat like normal. Error code n260 refers to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from receiving adequate power. You can examine the Nest’s C connector for the presence of a C wire and modify the wiring itself if there is. If not, you’ll need a Nest Power Connector.

Due to installation of a Nest Power Connector, you might notice error code E297 show up. 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

Like error code e103, e104 is a critical error stemming from an overcurrent. If excessive power is transported using the Nest’s wiring, it could damage internal components and may even be a fire hazard. If you see this error code appear on your Nest thermostat and want to protect from electrical damage, it’s suggested to turn the power off as soon as possible. You can then get a hold of a professional technician with the appropriate experience diagnosing and solving electrical issues.

e73 – Critical

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

This may be as straightforward as the breaker being turned off, but it can also be a problem 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 a good idea to contact a local professional.