Operating a Nest thermostat is one of the most convenient ways to perfect the everyday schedule of your comfort system. This smart thermostat can recognize 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 show up. The exact error code supplies useful information about the root of the problem, something a trained technician can use to offer solutions that much quicker.
Here are seven of the most likely error codes you could encounter on your Nest thermostat. We’ll explain the basics of each error code along with how you could solve it and the projected cost to do so. Keep in mind that while the price will ultimately hinge on the precise Nest model, you can anticipate paying about $75-$200 for repairs. This should also cover travel and labor costs as well as any specific hardware required to wrap up repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and is displayed when the power is shut off. Since 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 a number of reasons. The wiring might have disconnected or become damaged, or a disconnection may have happened further along in your home’s electrical system. This may be the circuit breaker, fuse box or system switch. A certified technician should check electrical connections and wiring until they find the root 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 will need to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not merely a software issue. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and begin looking at connectors.
They’ll detach the power and progressively inspect each wire, seeing to it that they are fully inserted into the connector with the correct amount of uncovered copper. When they pinpoint the problem connector, it can be swapped for a new one.
e195 – Critical
This critical error code can surface when the weather outside is especially hot. The HVAC system can break down and stop delivering power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat drains and the thermostat will subsequently shut down. Assuming the breakers are on, you can check a handful of other places before calling a professional technician.
Since this error can drain your thermostat’s battery, the first step may be supplying enough power to find out if this specific error code is what you’re working with. You can detach the thermostat from its base and provide power by using a USB cable. If it presents error code 195, you should continue to visually examine components such as the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to uncover anything wrong with these components, it will probably be best to call a pro.
e103 – Critical
Another critical error code, e103 indicates an electrical error with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is receiving more power than needed. This may stem from the breaker box, an error from the control board or through a bad connection in the thermostat. A technician can carefully examine and test the Nest’s electrical system to determine where the power is surging or why the thermostat is convinced there’s an overcurrent problem.
Although this error code isn’t critical, it could still keep you from using the Nest thermostat like normal. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from getting sufficient power. You can inspect 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 might notice error code E297 show up. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector is 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 originating from an overcurrent. If excessive power is transported using the Nest’s wiring, it can damage internal components and could 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 a good idea to shut the power off as soon as possible. You can then get in touch with a professional technician with the appropriate experience detecting and solving electrical damage.
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 may also be an issue with the wiring. After switching off the power to your HVAC system and thermostat, you can visually check 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 contact a local professional.