Operating a Nest thermostat is one of the best ways to improve the everyday schedule of your HVAC system. This smart thermostat can learn your preferences and automatically make changes. But as you can expect, it won’t work properly or at all if you see an error code on the display. The specific error code supplies useful information about the source of the problem, something a knowledgeable technician can use to present solutions that much quicker.
Here are seven of the most frequent error codes you might encounter on your Nest thermostat. We’ll explain the basics of each error code along with how you might solve it and the approximate cost to do so. Keep in mind that while the costs will ultimately hinge on the exact Nest model, you can expect to pay about $75-$200 for repairs. This should also cover travel and labor costs along with any specific parts 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 detached from the system. As 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 a number of reasons. The wiring may have disconnected or become damaged, or a disconnection might have occurred further along in your home’s electrical system. This could be the circuit breaker, fuse box or system switch. A trained technician should check electrical connections and wiring until they uncover the source of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring needs 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 merely a software error. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin checking connectors.
They’ll detach the power and gradually look at each wire, ensuring they are fully inserted into the connector with the correct amount of bare copper. When they find the problem connector, it can be replaced 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 persists, the backup battery in your thermostat drains and the thermostat will subsequently power down. Presuming the breakers are on, you can search a couple of other places before calling a professional technician.
Because this error can consume your thermostat’s battery, the first step might be providing enough power to find out if this specific error code is what you’re dealing with. You can detach the thermostat from its base and supply power by using a USB cable. In the event it reveals error code 195, you can continue to visually check components including the wiring as well as your air conditioner’s air filter or drainage system. If you struggle to uncover anything wrong with these components, it will probably be best to contact a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical problem with your Nest thermostat. More specifically, e103 will refer to an overcurrent problem, which means the wiring is getting more power than necessary. This will sometimes stem from the breaker box, an error from the control board or thanks to a bad connection in the thermostat. The technician needs to carefully inspect 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.
n260
While this error code isn’t critical, it might still prevent you from using the Nest thermostat how you want 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 receiving sufficient power. You can check the Nest’s C connector for the presence of a C wire and adapt the wiring itself if there is. If not, you need a Nest Power Connector.
During installation of a Nest Power Connector, you may notice error code E297 show up. This can be remedied 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
Like error code e103, e104 is a critical error originating from an overcurrent. If excess power is transported inside the Nest’s wiring, it may damage internal components and could even be a fire hazard. If you notice this error code appear on your Nest thermostat and want to take steps to prevent electrical damage, it’s suggested 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 issues.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power.
This may be as simple as the breaker being shut off, but it can also be a problem with the wiring. After switching 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 get in touch with a local professional.
