Operating a Nest thermostat is one of the most convenient ways to improve the day-to-day schedule of your comfort system. This smart thermostat can recognize your preferences and automatically make improvements. But as you may expect, it won’t work well or at all if you see an error code show up. The precise error code provides useful information about the source of the problem, something a professional technician can use to provide solutions that much quicker.
Let’s consider seven of the most likely error codes you could encounter on your Nest thermostat. We’ll review the basics of each error code on top of how you might fix it and the projected cost to do so. Remember that while the investment will ultimately depend on the exact Nest model, you can anticipate paying between $75-$200 for repairs. This should also cover travel and labor costs on top of any specific hardware needed to wrap up repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and is displayed when the power is shut off. Since this is a critical power error, the thermostat will swap 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 may have occurred further along in your home’s electrical system. This might 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 shows up when your Nest thermostat’s wiring should be reconfigured. More specifically, the technician will need to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not simply a software issue. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start inspecting connectors.
They’ll disconnect the power and progressively inspect each wire, seeing to it that they are fully attached into the connector with the proper amount of uncovered copper. When they find the problem connector, it can be replaced 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 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 couple of other places before calling a professional technician.
Because this error can deplete your thermostat’s battery, the first step might be restoring enough power to figure out if this specific error code is what you’re dealing with. You can separate 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 struggle to detect anything wrong with these components, it will probably be best to contact a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical issue with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is receiving 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 bad connection in the thermostat. A technician can meticulously examine and test the Nest’s electrical system to determine where the power is surging or why the thermostat is convinced there’s an overcurrent problem.
Although this error code isn’t critical, it may still keep you from using the Nest thermostat how you prefer to. Error code n260 concerns the lack of a C wire or Nest Power Connector, as not having one can block your Nest from obtaining adequate power. You can inspect 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.
Due to installation of a Nest Power Connector, you may notice error code E297 appear. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead need to update the wiring info in the app from Settings -> Thermostat -> Wiring -> Update wiring.
e104 – Critical
Similar to error code e103, e104 is a critical error originating from an overcurrent. If excessive power is transported through the Nest’s wiring, it may damage internal components and may even be a fire hazard. If you see this error code pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s a good idea to switch the power off as soon as possible. You can then contact a professional technician with the necessary 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 will sometimes be as easy as the breaker being shut off, but it may also be a problem with the wiring. After turning off the power to your HVAC system and thermostat, you can visually examine the wires to make sure none of them are loose or damaged. If nothing seems to be out of place, it’s a good idea to speak with a local professional.