Using a Nest thermostat is one of the easiest ways to optimize the everyday schedule of your heating and cooling. This smart thermostat can be taught your preferences and automatically make changes. But as you might expect, it won’t work properly or at all if you see an error code appear. The exact error code offers useful information about the underlying problem, something a knowledgeable technician can use to present solutions that much sooner.
Here are seven of the most common error codes you could find on your Nest thermostat. We’ll explain the basics of each error code on top of how you could solve it and the projected cost to do so. Remember that while the price will ultimately hinge on the precise Nest model, you can anticipate paying about $75-$200 for repairs. This should include things like travel and labor costs as well as any specific parts needed to wrap up 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 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 numerous reasons. The wiring may have disconnected or become damaged, or a disconnection might have appeared further along in your home’s electrical system. This may be the circuit breaker, fuse box or system switch. A professional technician can check electrical connections and wiring until they locate the source of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring should be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not simply a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin inspecting 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 exposed copper. When they find the problem connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can appear when the weather outside is particularly hot. The HVAC system can break down and stop delivering power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat depletes and the thermostat will subsequently power down. In the event the breakers are on, you can check a handful of other places before consulting a professional technician.
Since this error can consume your thermostat’s battery, the first step could be supplying enough power to find out if this specific error code is what you’re working with. You can separate the thermostat from its base and provide power through a USB cable. If it displays error code 195, you may continue to visually inspect components like the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to detect anything wrong with these components, it’s maybe best to get in touch with 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 getting more power than needed. This may stem from the breaker box, an error from the control board or because of a bad connection in the thermostat. A technician needs to carefully investigate and test the Nest’s electrical system to figure out where the power is surging or why the thermostat believes there’s an overcurrent problem.
n260
While this error code isn’t critical, it can still stop you from using the Nest thermostat how you prefer to. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from obtaining enough power. You can inspect the Nest’s C connector for the presence of a C wire and adapt the wiring itself if there is. If not, you’ll need a Nest Power Connector.
Due to installation of a Nest Power Connector, you might notice error code E297 appear. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector was 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 inside 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 guard against electrical damage, it’s recommended to switch the power off as soon as you can. You can then contact a professional technician with the appropriate experience diagnosing and resolving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not getting power.
This might be as straightforward as the breaker being turned off, but it can also be something with the wiring. After switching off the power to your HVAC system and thermostat, you can visually check the wires to make sure nothing is loose or damaged. If nothing appears to be out of place, it’s time to get in touch with a local professional.