Installing a Nest thermostat is one of the most convenient ways to improve the everyday schedule of your comfort system. This smart thermostat can recognize 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 show up. The exact error code provides useful information about the underlying problem, something a knowledgeable technician can use to provide solutions that much quicker.
Listed below are seven of the most frequent error codes you may discover on your Nest thermostat. We’ll review the basics of each error code along with how you can fix it and the approximate cost to do so. Remember that while the investment will ultimately hinge on the precise Nest model, you can expect to pay about $75-$200 for repairs. This should include travel and labor costs on top of any specific components required to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and shows up when the power is shut off. 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 problem 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 might be the circuit breaker, fuse box or system switch. A knowledgeable technician should inspect electrical connections and wiring until they locate the root of the problem.
e294 – Critical
Critical error code e294 shows up when your Nest thermostat’s wiring needs to be reconfigured. More specifically, you’ll need the technician to reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to make sure it’s not simply a software issue. If that doesn’t work, they’ll check the wiring diagram of the thermostat and begin looking at connectors.
They’ll disconnect the power and progressively inspect each wire, ensuring they are fully inserted into the connector with the correct amount of exposed copper. After they locate the problem connector, it can be swapped for a new one.
e195 – Critical
This critical error code can surface when the weather outside is particularly hot. The HVAC system can shut down and stop giving power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat drains and the thermostat will eventually shut down. Assuming the breakers are on, you can search a handful of other places before consulting a professional technician.
As this error can consume your thermostat’s battery, the first step may be restoring enough power to determine if this specific error code is what you’re working with. You can detach the thermostat from its base and supply power by using a USB cable. Assuming it displays error code 195, you may continue to visually examine 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’s maybe best to get in touch with 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 what is safe and normal. This may stem from the breaker box, an error from the control board or thanks to a defective connection in the thermostat. Your technician needs to meticulously inspect 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.
Even though this error code isn’t critical, it might still stop 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 adequate power. You can check the Nest’s C connector for the presence of a C wire and modify the wiring itself if there is. If not, you need a Nest Power Connector.
With installation of a Nest Power Connector, you may notice error code E297 appear. This can be resolved by updating your thermostat in Settings -> Software -> Update. If the Power Connector has already been installed, you’ll instead be required 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 that’s the result of an overcurrent. If excessive power is transported using the Nest’s wiring, it may 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 guard against 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 proper experience identifying and resolving electrical problems.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not receiving power.
This will sometimes 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 inspect the wires to make sure none of them are loose or damaged. If nothing seems to be out of place, it’s time to speak with a local professional.