Using a Nest thermostat is one of the easiest ways to optimize the daily schedule of your heating and cooling. This smart thermostat can be taught your preferences and automatically make adjustments. But as you can expect, it won’t work well or at all if you see an error code show up. The precise error code provides useful information about the underlying problem, something a professional technician can use to offer solutions that much quicker.

Let’s consider seven of the most common error codes you may encounter on your Nest thermostat. We’ll review the basics of each error code as well as how you could solve it and the approximate cost to do so. Remember that while the costs will ultimately depend on the precise Nest model, you can expect to pay between $75-$200 for repairs. This should also cover travel and labor costs as well as any specific components required to finish repairs.

e298 – Critical

This critical error code is limited to the latest models of the Nest thermostat and shows up when the power is disconnected from the system. Because this is a critical power error, the thermostat will swap to the backup battery system. The error message will remain on the screen until the problem is fixed.

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 the electrical system. This could be the circuit breaker, fuse box or system switch. A trained technician can examine electrical connections and wiring until they locate 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 should reconfigure the R wire. They’ll first complete a factory reset of your thermostat to make sure it’s not merely a software issue. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin inspecting connectors.

They’ll disconnect the power and slowly inspect each wire, seeing to it that they are fully inserted into the connector with the proper amount of bare copper. After they pinpoint the problem connector, it can be replaced for a new one.

e195 – Critical

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

Because this error can deplete your thermostat’s battery, the first step might be restoring enough power to determine if this specific error code is what you’re facing. You can separate the thermostat from its base and provide power with a USB cable. If it displays error code 195, you should continue to visually check components such as 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 will probably be best to get in touch with a pro.

e103 – Critical

Another critical error code, e103 signifies an electrical error with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is getting more power than what is safe and normal. This may stem from the breaker box, an error from the control board or because of a faulty connection in the thermostat. A technician will meticulously 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 could still prevent you from using the Nest thermostat how you prefer to. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from receiving enough power. You can check 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.

During installation of a Nest Power Connector, you may notice error code E297 appear. This can be resolved 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 too much power is transported using the Nest’s wiring, it may 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 guard against electrical damage, it’s a good idea to turn the power off as soon as possible. You can then get in touch with a professional technician with the appropriate experience identifying and resolving electrical problems.

e73 – Critical

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

This might be as easy as the breaker being turned off, but it could also be something 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 appears to be out of place, it’s a good idea to get in touch with a local professional.