Installing a Nest thermostat is one of the best ways to improve the daily schedule of your comfort system. This smart thermostat can be taught your preferences and automatically make adjustments. But as you can expect, it won’t work well or at all if you see an error code appear. The specific error code offers useful information about the source of the problem, something a professional technician can use to present solutions that much quicker.
Listed below are seven of the most likely error codes you may encounter on your Nest thermostat. We’ll explain the basics of each error code on top of how you could address it and the estimated cost to do so. Remember that while the costs will ultimately depend on the precise Nest model, you can expect to pay around $75-$200 for repairs. This should include things like travel and labor costs along with any specific parts necessary to complete repairs.
e298 – Critical
This critical error code is limited to the latest 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 continue to be displayed until the problem is resolved.
Losing power to your Nest thermostat can be for several reasons. The wiring might have disconnected or become damaged, or a disconnection could have occurred further along in your home’s electrical system. This may be the circuit breaker, fuse box or system switch. A knowledgeable technician will check 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 should be reconfigured. More specifically, the technician will need to reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to ensure 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 slowly look at each wire, ensuring they are fully placed into the connector with the proper amount of bare copper. When they locate the damaged connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can surface when the weather outside is especially hot. The HVAC system can break down and stop delivering power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat depletes and the thermostat will eventually power down. Presuming the breakers are on, you can inspect a handful of other places before consulting a professional technician.
Since this error can drain your thermostat’s battery, the first step may be restoring enough power to determine if this specific error code is what you’re working with. You can disconnect the thermostat from its base and supply power with a USB cable. Assuming it displays error code 195, you can continue to visually examine components like the wiring as well as your air conditioner’s air filter or drainage system. If you don’t detect anything wrong with these components, it will likely be best to get in touch with 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 getting more power than needed. This can stem from the breaker box, an error from the control board or through a bad connection in the thermostat. A technician should meticulously inspect and test the Nest’s electrical system to determine where the power is surging or why the thermostat thinks there’s an overcurrent problem.
n260
While this error code isn’t critical, it could 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 not having one can block your Nest from receiving sufficient power. You can inspect 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 will sometimes notice error code E297 be displayed. This can be remedied 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
Just like error code e103, e104 is a critical error stemming from 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 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 straightaway. You can then get a hold of a professional technician with the appropriate experience detecting and fixing electrical issues.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power.
This could be as straightforward as the breaker being shut 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 examine the wires to make sure none of them are loose or damaged. If nothing appears to be out of place, it’s a good idea to speak with a local professional.