Using a Nest thermostat is one of the easiest ways to improve the day-to-day schedule of your heating and cooling. This smart thermostat can recognize your preferences and automatically make changes. But as you might expect, it won’t work correctly or at all if you see an error code appear. The precise error code provides useful information about the underlying problem, something a trained technician can use to offer solutions that much faster.
Let’s consider seven of the most common error codes you could encounter on your Nest thermostat. We’ll explain the basics of each error code along with how you can fix it and the estimated cost to do so. Don’t forget that while the investment will ultimately depend on the exact 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 hardware needed to finish repairs.
e298 – Critical
This critical error code is limited to newer 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 dealt with.
Losing power to your Nest thermostat can be for a number of reasons. The wiring may have disconnected or become damaged, or a disconnection could have occurred further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A certified technician can examine electrical connections and wiring until they find the source of the problem.
e294 – Critical
Critical error code e294 shows up when your Nest thermostat’s wiring has 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 simply a software issue. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start inspecting connectors.
They’ll shut off the power and progressively check each wire, ensuring they are fully inserted into the connector with the correct amount of bare copper. When they pinpoint the problem connector, it can be replaced for a new one.
e195 – Critical
This critical error code can appear when the weather outside is particularly hot. The HVAC system can shut down and stop delivering 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 few other places before contacting a professional technician.
As this error can deplete your thermostat’s battery, the first step could be providing 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 with a USB cable. If it reveals error code 195, you can continue to visually examine components including 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 contact a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical problem with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is getting more power than what is safe and normal. This can stem from the breaker box, an error from the control board or because of a defective connection in the thermostat. A technician will meticulously investigate and test the Nest’s electrical system to understand 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 keep you from using the Nest thermostat like normal. Error code n260 concerns the lack of a C wire or Nest Power Connector, as missing one can block your Nest from getting adequate 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 need a Nest Power Connector.
During installation of a Nest Power Connector, you will sometimes 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 have 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 that’s the result of an overcurrent. If excessive power is being delivered through the Nest’s wiring, it could damage internal components and can even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to guard against electrical damage, it’s recommended to shut the power off as soon as you can. You can then get in touch with a professional technician with the appropriate experience detecting and resolving 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 easy as the breaker being switched off, but it may also be a problem with the wiring. After shutting 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 speak with a local professional.