Operating a Nest thermostat is one of the most convenient ways to improve the everyday schedule of your HVAC system. This smart thermostat can be taught your preferences and automatically make changes. But as you can expect, it won’t work correctly or at all if you see an error code appear. The precise error code supplies useful information about the source of the problem, something a knowledgeable technician can use to offer solutions that much quicker.
Here are seven of the most likely error codes you could encounter on your Nest thermostat. We’ll review the basics of each error code as well as how you could solve it and the projected cost to do so. Keep in mind that while the investment will ultimately depend on the specific 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 components necessary to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and appears when the power is shut off. As 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 numerous reasons. The wiring could have disconnected or become damaged, or a disconnection may have happened further along in your electrical system. This might be the circuit breaker, fuse box or system switch. A knowledgeable technician can inspect electrical connections and wiring until they locate the source of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring has to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first complete a factory reset of your thermostat to ensure it’s not just a software error. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin checking connectors.
They’ll detach the power and gradually inspect each wire, making sure they are fully inserted into the connector with the correct amount of exposed copper. When they locate the problem connector, it can be exchanged 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 lasts, the backup battery in your thermostat depletes and the thermostat will finally turn off. Presuming the breakers are on, you can search a handful of other places before contacting a professional technician.
As this error can deplete your thermostat’s battery, the first step might be restoring enough power to determine if this specific error code is what you’re dealing with. You can detach the thermostat from its base and deliver power with a USB cable. Assuming it displays 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 uncover anything wrong with these components, it will probably be best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical error with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is experiencing more power than necessary. This can stem from the breaker box, an error from the control board or through a faulty connection in the thermostat. Your technician will meticulously 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
Although this error code isn’t critical, it could still keep 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 not having one can block your Nest from obtaining enough 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 can get 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 be required 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 too much power is being delivered through the Nest’s wiring, it could damage internal components and may even be a fire hazard. If you see this error code appear on your Nest thermostat and want to protect from electrical damage, it’s suggested to shut the power off as soon as possible. You can then contact 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 getting power.
This will sometimes be as straightforward as the breaker being turned off, but it may also be a problem with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure nothing is loose or damaged. If nothing seems to be out of place, it’s time to get in touch with a local professional.