How to Resolve These Seven Error Codes on Your Nest Thermostat

Installing a Nest thermostat is one of the easiest ways to optimize the day-to-day schedule of your comfort system. This smart thermostat can be taught 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 show up. The exact error code supplies useful information about the source of the problem, something a trained technician can use to present solutions that much sooner.

Here are seven of the most frequent error codes you may encounter on your Nest thermostat. We’ll explain the basics of each error code as well as how you might fix it and the approximate cost to do so. Remember that while the costs will ultimately depend on the precise Nest model, you can count on paying about $75-$200 for repairs. This should include things like travel and labor costs along with any specific parts needed to finish repairs.

e298 – Critical

This critical error code is limited to new models of the Nest thermostat and shows up when the power is detached 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 issue is fixed.

Losing power to your Nest thermostat can be for several reasons. The wiring may have disconnected or become damaged, or a disconnection might have appeared further along in the electrical system. This could be the circuit breaker, fuse box or system switch. A professional technician will examine electrical connections and wiring until they uncover the source of the problem.

e294 – Critical

Critical error code e294 is displayed when your Nest thermostat’s wiring needs to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first perform a factory reset of your thermostat to ensure it’s not merely a software problem. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and begin inspecting connectors.

They’ll disconnect the power and progressively inspect each wire, ensuring they are fully placed into the connector with the correct amount of exposed copper. Once they pinpoint the problem connector, it can be swapped for a new one.

e195 – Critical

This critical error code can show up when the weather outside is severely hot. The HVAC system can break down and stop sending power to your Nest thermostat. When this problem persists, the backup battery in your thermostat drains and the thermostat will subsequently power down. Presuming the breakers are on, you can search a handful of other places before consulting a professional technician.

As this error can consume your thermostat’s battery, the first step might be supplying enough power to find out if this specific error code is what you’re facing. You can disconnect the thermostat from its base and supply power by using a USB cable. In the event it reveals error code 195, you may continue to visually check components such as 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 will likely be best to call a pro.

e103 – Critical

Another critical error code, e103 signifies 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 necessary. This will sometimes stem from the breaker box, an error from the control board or thanks to a defective connection in the thermostat. Your technician can 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

Even though this error code isn’t critical, it might 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 missing one can block your Nest from receiving adequate power. You can inspect 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.

With installation of a Nest Power Connector, you might 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

Similar to error code e103, e104 is a critical error originating from an overcurrent. If excess power is transported inside the Nest’s wiring, it may damage internal components and could even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s a good idea to turn the power off as soon as you can. You can then get in touch with a professional technician with the proper experience identifying and resolving electrical problems.

e73 – Critical

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

This could be as easy as the breaker being switched 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 check the wires to make sure none of them are loose or damaged. If nothing seems to be out of place, it’s time to get in touch with a local professional.