Operating a Nest thermostat is one of the most convenient ways to improve the day-to-day schedule of your heating and cooling. This smart thermostat can learn your preferences and automatically make changes. But as you can expect, it won’t work well or at all if you see an error code show up. The exact error code offers useful information about the root of the problem, something a trained technician can use to offer solutions that much faster.
Here are seven of the most common error codes you could discover on your Nest thermostat. We’ll explain the basics of each error code along with how you can solve it and the estimated cost to do so. Remember that while the price will ultimately hinge on the precise Nest model, you can count on paying between $75-$200 for repairs. This should include things like travel and labor costs as well as any specific hardware necessary to wrap up repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and appears when the power is detached from the system. Since this is a critical power error, the thermostat will change 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 might have disconnected or become damaged, or a disconnection may have occurred further along in your electrical system. This could be the circuit breaker, fuse box or system switch. A knowledgeable technician can check electrical connections and wiring until they uncover the root of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring needs to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to make sure it’s not just a software error. If that doesn’t work, they’ll check the wiring diagram of the thermostat and start inspecting connectors.
They’ll shut off the power and slowly inspect each wire, seeing to it that they are fully attached into the connector with the correct amount of uncovered copper. Once they find the damaged connector, it can be replaced for a new one.
e195 – Critical
This critical error code can surface when the weather outside is severely hot. The HVAC system can break down and stop giving power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will subsequently power down. In the event the breakers are on, you can inspect a handful of other places before calling a professional technician.
Since this error can deplete your thermostat’s battery, the first step could be supplying enough power to find out if this specific error code is what you’re dealing with. You can separate the thermostat from its base and supply power by using a USB cable. In the event it presents error code 195, you can continue to visually check components like the wiring as well as your air conditioner’s air filter or drainage system. If you can’t detect 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 experiencing more power than necessary. This may stem from the breaker box, an error from the control board or through a faulty connection in the thermostat. The technician will meticulously inspect and test the Nest’s electrical system to understand where the power is surging or why the thermostat thinks there’s an overcurrent problem.
n260
Even though this error code isn’t critical, it may still prevent you from using the Nest thermostat how you want to. Error code n260 refers to the lack of a C wire or Nest Power Connector, as missing one can block your Nest from getting sufficient power. You can examine 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.
During installation of a Nest Power Connector, you may 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
Just like error code e103, e104 is a critical error originating from an overcurrent. If too much power is being delivered using the Nest’s wiring, it may damage internal components and may even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to guard against electrical damage, it’s suggested to shut the power off straightaway. You can then get a hold of a professional technician with the necessary experience identifying and fixing electrical damage.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This could be as simple as the breaker being switched off, but it can also be an issue with the wiring. After turning off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure nothing is loose or damaged. If nothing looks to be out of place, it’s a good idea to get in touch with a local professional.