Using a Nest thermostat is one of the most convenient ways to perfect the daily schedule of your comfort system. This smart thermostat can recognize your preferences and automatically make improvements. But as you can expect, it won’t work well or at all if you see an error code show up. The specific error code supplies useful information about the source of the problem, something a knowledgeable technician can use to provide solutions that much sooner.
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 might solve it and the approximate cost to do so. Keep in mind that while the investment will ultimately be dependent on the specific Nest model, you can expect to pay around $75-$200 for repairs. This should also cover travel and labor costs as well as any specific components necessary 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 detached from the system. Since this is a critical power error, the thermostat will switch to the backup battery system. The error message will remain on display until the problem is resolved.
Losing power to your Nest thermostat can be for a number of reasons. The wiring could have disconnected or become damaged, or a disconnection could have occurred further along in your electrical system. This might be the circuit breaker, fuse box or system switch. A certified technician should examine electrical connections and wiring until they locate the source of the problem.
e294 – Critical
Critical error code e294 is displayed when your Nest thermostat’s wiring should be reconfigured. More specifically, you’ll need the technician to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to make sure it’s not merely a software issue. If that doesn’t work, they’ll review the wiring diagram of the thermostat and begin looking at connectors.
They’ll shut off the power and gradually look at each wire, ensuring they are fully attached into the connector with the correct amount of bare copper. After they pinpoint the damaged connector, it can be replaced for a new one.
e195 – Critical
This critical error code can show up when the weather outside is particularly 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 depletes and the thermostat will eventually turn off. Presuming the breakers are on, you can inspect a few other places before contacting a professional technician.
Because this error can deplete your thermostat’s battery, the first step could be restoring enough power to figure out if this specific error code is what you’re working with. You can detach the thermostat from its base and deliver power with a USB cable. If it reveals error code 195, you can continue to visually inspect components including the wiring as well as your air conditioner’s air filter or drainage system. If you can’t detect anything wrong with these components, it’s maybe best to contact a pro.
e103 – Critical
Another critical error code, e103 indicates an electrical problem 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 may stem from the breaker box, an error from the control board or because of a faulty connection in the thermostat. The technician can carefully investigate and test the Nest’s electrical system to understand where the power is surging or why the thermostat is convinced there’s an overcurrent problem.
n260
Even though this error code isn’t critical, it can still prevent you from using the Nest thermostat how you want to. Error code n260 refers to the lack of a C wire or Nest Power Connector, as the absence of one can block your Nest from getting adequate power. You can inspect the Nest’s C connector for the presence of a C wire and adapt the wiring itself if there is. If not, you’ll need a Nest Power Connector.
Due to installation of a Nest Power Connector, you will sometimes notice error code E297 show up. This can be remedied by updating your thermostat in Settings -> Software -> Update. If the Power Connector is 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 that’s the result of an overcurrent. If excessive 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 pop up on your Nest thermostat and want to protect from electrical damage, it’s suggested to switch the power off as soon as you can. You can then get a hold of a professional technician with the appropriate experience diagnosing and solving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not getting power.
This may be as straightforward as the breaker being turned off, but it can also be something with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually inspect the wires to make sure none of them are loose or damaged. If nothing appears to be out of place, it’s best to speak with a local professional.