Operating a Nest thermostat is one of the easiest ways to improve the day-to-day schedule of your HVAC system. This smart thermostat can learn your preferences and automatically make improvements. But as you can expect, it won’t work properly or at all if you see an error code on the display. The precise error code provides useful information about the root of the problem, something a knowledgeable technician can use to present solutions that much sooner.
Let’s consider seven of the most likely error codes you might encounter on your Nest thermostat. We’ll explain the basics of each error code along with how you could solve it and the projected cost to do so. Keep in mind that while the investment will ultimately hinge on the exact Nest model, you can expect to pay about $75-$200 for repairs. This should include things like travel and labor costs as well as any specific hardware necessary to finish repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and is displayed when the power is shut off. Because 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 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 might have appeared further along in your electrical system. This might be the circuit breaker, fuse box or system switch. A trained technician will check electrical connections and wiring until they find the root of the problem.
e294 – Critical
Critical error code e294 is displayed 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 ensure it’s not just a software problem. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin checking connectors.
They’ll shut off the power and slowly look at each wire, seeing to it that they are fully attached into the connector with the correct amount of exposed copper. After they find the damaged connector, it can be swapped for a new one.
e195 – Critical
This critical error code can appear when the weather outside is especially hot. The HVAC system can shut down and stop delivering power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat drains and the thermostat will eventually turn off. In the event the breakers are on, you can inspect a few other places before contacting a professional technician.
Since this error can deplete your thermostat’s battery, the first step might be supplying enough power to determine if this specific error code is what you’re facing. You can detach the thermostat from its base and provide power by using a USB cable. Assuming it presents error code 195, you can continue to visually inspect components like the wiring as well as your air conditioner’s air filter or drainage system. If you can’t find 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 problem with your Nest thermostat. More specifically, e103 can 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 because of a faulty connection in the thermostat. The technician needs to carefully investigate and test the Nest’s electrical system to figure out 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 prevent 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 missing one can block your Nest from receiving enough 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’ll need a Nest Power Connector.
During installation of a Nest Power Connector, you may notice error code E297 appear. 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
Like error code e103, e104 is a critical error stemming from an overcurrent. If excess power is sent through the Nest’s wiring, it could damage internal components and could even be a fire hazard. If you see this error code pop up on your Nest thermostat and want to protect from electrical damage, it’s a good idea to shut the power off straightaway. You can then get in touch with a professional technician with the necessary experience detecting and solving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not getting power.
This may be as easy as the breaker being turned off, but it can also be an issue 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 best to get in touch with a local professional.