Here's What These 7 Nest Thermostat Error Codes Mean

Installing a Nest thermostat is one of the easiest ways to improve the daily schedule of your comfort system. This smart thermostat can learn your preferences and automatically make adjustments. But as you can expect, it won’t work properly or at all if you see an error code appear. The specific error code supplies useful information about the underlying problem, something a knowledgeable technician can use to present solutions that much sooner.

Let’s consider seven of the most common error codes you may encounter on your Nest thermostat. We’ll walk you through the basics of each error code as well as how you can address it and the projected cost to do so. Don’t forget that while the price will ultimately depend on the exact Nest model, you can expect to pay about $75-$200 for repairs. This should include things like travel and labor costs as well as any specific parts required to complete repairs.

e298 – Critical

This critical error code is limited to newer 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 continue to be displayed until the issue is resolved.

Losing power to your Nest thermostat can be for several reasons. The wiring might have disconnected or become damaged, or a disconnection could have occurred further along in the electrical system. This could be the circuit breaker, fuse box or system switch. A knowledgeable technician can examine electrical connections and wiring until they locate 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, 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 merely a software issue. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin checking connectors.

They’ll shut off the power and progressively check each wire, ensuring they are fully placed into the connector with the proper amount of bare copper. When they pinpoint the problem connector, it can be replaced for a new one.

e195 – Critical

This critical error code can appear when the weather outside is especially hot. The HVAC system can break down and stop delivering power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat drains and the thermostat will finally shut down. Assuming the breakers are on, you can examine a couple of other places before contacting a professional technician.

Because this error can consume your thermostat’s battery, the first step could be supplying enough power to find out 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 displays 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’s maybe best to get in touch with a pro.

e103 – Critical

Another critical error code, e103 indicates an electrical malfunction with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is receiving more power than needed. This can stem from the breaker box, an error from the control board or through a defective connection in the thermostat. A technician needs to carefully examine 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

While this error code isn’t critical, it could still keep 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 enough power. You can check the Nest’s C connector for the presence of a C wire and modify the wiring itself if there is. If not, you need a Nest Power Connector.

During installation of a Nest Power Connector, you may notice error code E297 show up. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead have 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 originating from an overcurrent. If excessive power is being delivered through the Nest’s wiring, it could damage internal components and may even be a fire hazard. If you see this error code show up on your Nest thermostat and want to protect from electrical damage, it’s suggested 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 fixing electrical malfunctions.

e73 – Critical

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

This may be as easy as the breaker being switched off, but it may also be a problem with the wiring. After shutting 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 seems to be out of place, it’s a good idea to contact a local professional.