Using a Nest thermostat is one of the easiest ways to optimize the daily schedule of your HVAC system. This smart thermostat can learn 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 on the display. The precise error code offers useful information about the source of the problem, something a knowledgeable technician can use to offer solutions that much quicker.
Let’s consider seven of the most frequent error codes you might find on your Nest thermostat. We’ll walk you through the basics of each error code as well as how you might address it and the estimated cost to do so. Keep in mind that while the investment will ultimately hinge on the precise Nest model, you can count on paying between $75-$200 for repairs. This should also cover travel and labor costs along with any specific components 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 disconnected 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 issue is fixed.
Losing power to your Nest thermostat can be for numerous reasons. The wiring might have disconnected or become damaged, or a disconnection may have appeared further along in the 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 root of the problem.
e294 – Critical
Critical error code e294 shows up when your Nest thermostat’s wiring has to be reconfigured. More specifically, you’ll need the technician to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to make sure it’s not just a software error. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start checking connectors.
They’ll detach the power and progressively inspect each wire, seeing to it that they are fully placed into the connector with the proper amount of bare copper. After they find the damaged connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can show up when the weather outside is particularly hot. The HVAC system can break down and stop sending power to your Nest thermostat. When this problem persists, the backup battery in your thermostat drains and the thermostat will eventually turn off. Presuming 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 might be supplying enough power to figure 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. In the event it presents error code 195, you may continue to visually check 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 contact a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical error with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is getting more power than needed. This will sometimes stem from the breaker box, an error from the control board or thanks to a defective connection in the thermostat. Your technician will cautiously inspect 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
Even though this error code isn’t critical, it may still stop you from using the Nest thermostat like normal. Error code n260 refers 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 adjust the wiring itself if there is. If not, you’ll need a Nest Power Connector.
With installation of a Nest Power Connector, you will sometimes notice error code E297 show up. This can be resolved by updating your thermostat in Settings -> Software -> Update. If the Power Connector was already installed, you’ll instead need 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 that’s the result of an overcurrent. If excessive power is sent 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 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 diagnosing and solving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not receiving power.
This might be as simple as the breaker being switched off, but it may also be something with the wiring. After shutting 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 seems to be out of place, it’s best to speak with a local professional.
