Operating a Nest thermostat is one of the most convenient ways to improve the everyday schedule of your heating and cooling. This smart thermostat can learn your preferences and automatically make changes. But as you may expect, it won’t work well or at all if you see an error code appear. The precise error code provides useful information about the root of the problem, something a trained technician can use to offer solutions that much sooner.
Here are seven of the most common error codes you may discover on your Nest thermostat. We’ll explain the basics of each error code as well as how you can fix it and the estimated cost to do so. Don’t forget that while the costs will ultimately depend on the precise Nest model, you can anticipate paying about $75-$200 for repairs. This should include travel and labor costs as well as any specific components required to finish repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and shows up when the power is detached from the system. Since this is a critical power error, the thermostat will swap to the backup battery system. The error message will continue to be displayed 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 appeared further along in the electrical system. This may be the circuit breaker, fuse box or system switch. A trained technician can inspect electrical connections and wiring until they find the source 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 will need to reconfigure the R wire. They’ll first complete a factory reset of your thermostat to make sure it’s not just a software problem. If that doesn’t work, they’ll review the wiring diagram of the thermostat and start inspecting connectors.
They’ll detach the power and gradually inspect each wire, seeing to it that they are fully attached into the connector with the correct amount of bare copper. After they locate the problem connector, it can be exchanged 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 sending power to your Nest thermostat. When this problem lingers, the backup battery in your thermostat drains and the thermostat will subsequently shut down. Presuming the breakers are on, you can check a handful of other places before contacting a professional technician.
As this error can consume your thermostat’s battery, the first step might be restoring enough power to find out if this specific error code is what you’re dealing with. You can separate the thermostat from its base and deliver power through a USB cable. Assuming it displays error code 195, you should continue to visually check components like the wiring as well as your air conditioner’s air filter or drainage system. If you can’t uncover anything wrong with these components, it will probably be best to call a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical issue with your Nest thermostat. More specifically, e103 may 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 thanks to a bad connection in the thermostat. A technician should cautiously inspect and test the Nest’s electrical system to determine where the power is surging or why the thermostat believes there’s an overcurrent problem.
Although this error code isn’t critical, it might still prevent you from using the Nest thermostat how you want to. Error code n260 concerns 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 adjust the wiring itself if there is. If not, you’ll need a Nest Power Connector.
During installation of a Nest Power Connector, you might 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 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 originating from an overcurrent. If excess power is being delivered using the Nest’s wiring, it can damage internal components and can even be a fire hazard. If you notice this error code show up on your Nest thermostat and want to protect from electrical damage, it’s a good idea to turn the power off as soon as possible. You can then contact a professional technician with the appropriate experience detecting and resolving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This may be as simple as the breaker being shut off, but it could also be a problem with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually check 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 get in touch with a local professional.