Using a Nest thermostat is one of the most convenient ways to optimize the day-to-day schedule of your comfort system. This smart thermostat can learn your preferences and automatically make adjustments. But as you may expect, it won’t work properly or at all if you see an error code show up. The specific error code provides useful information about the root of the problem, something a professional technician can use to provide solutions that much sooner.
Let’s consider seven of the most common error codes you could encounter on your Nest thermostat. We’ll walk you through the basics of each error code along with how you could solve it and the estimated cost to do so. Don’t forget that while the investment will ultimately hinge on the specific Nest model, you can anticipate paying around $75-$200 for repairs. This should include things like travel and labor costs along with any specific parts required to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and is displayed when the power is detached from the system. As this is a critical power error, the thermostat will swap to the backup battery system. The error message will continue to be displayed until the problem is resolved.
Losing power to your Nest thermostat can be for numerous reasons. The wiring may have disconnected or become damaged, or a disconnection could have happened further along in your electrical system. This could be the circuit breaker, fuse box or system switch. A professional technician can examine electrical connections and wiring until they locate 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 should reconfigure the R wire. They’ll first perform a factory reset of your thermostat to ensure it’s not just a software problem. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin looking at connectors.
They’ll detach the power and progressively look at each wire, seeing to it that they are fully attached into the connector with the correct amount of uncovered copper. When they locate the malfunctioning connector, it can be swapped for a new one.
e195 – Critical
This critical error code can show up when the weather outside is especially hot. The HVAC system can fail and stop giving power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat drains and the thermostat will eventually power down. In the event the breakers are on, you can search a couple of other places before calling a professional technician.
Because this error can consume your thermostat’s battery, the first step might be supplying enough power to figure out if this specific error code is what you’re facing. You can detach the thermostat from its base and supply power with a USB cable. In the event it displays error code 195, you should continue to visually check components like 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’s maybe best to contact a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical error with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is getting more power than necessary. This may stem from the breaker box, an error from the control board or thanks to a bad connection in the thermostat. Your technician can carefully 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
While this error code isn’t critical, it could still prevent 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 obtaining enough 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 can get a Nest Power Connector.
Due to 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
Just 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 could even be a fire hazard. If you see this error code appear on your Nest thermostat and want to take steps to prevent electrical damage, it’s suggested to turn the power off as soon as possible. You can then contact a professional technician with the proper experience detecting and resolving electrical damage.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not receiving power.
This will sometimes be as straightforward as the breaker being shut off, but it can also be an issue with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually examine the wires to make sure nothing is loose or damaged. If nothing appears to be out of place, it’s time to contact a local professional.
