Installing a Nest thermostat is one of the most convenient ways to perfect the daily schedule of your HVAC system. This smart thermostat can recognize your preferences and automatically make changes. But as you might expect, it won’t work properly or at all if you see an error code appear. The specific error code offers useful information about the root of the problem, something a professional technician can use to provide solutions that much quicker.
Let’s consider seven of the most likely error codes you might find on your Nest thermostat. We’ll review the basics of each error code on top of how you could fix it and the estimated cost to do so. Remember that while the price will ultimately hinge on the specific Nest model, you can count on paying about $75-$200 for repairs. This should also cover travel and labor costs on top of any specific components necessary to complete repairs.
e298 – Critical
This critical error code is limited to the latest models of the Nest thermostat and shows up when the power is disconnected from the system. Because this is a critical power error, the thermostat will switch to the backup battery system. The error message will remain on the screen until the issue is resolved.
Losing power to your Nest thermostat can be for numerous reasons. The wiring might have disconnected or become damaged, or a disconnection could have appeared further along in your electrical system. This may be the circuit breaker, fuse box or system switch. A knowledgeable technician should examine 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 should be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to make sure it’s not just a software problem. If that doesn’t work, they’ll check the wiring diagram of the thermostat and start inspecting connectors.
They’ll shut off the power and slowly look at each wire, making sure they are fully attached into the connector with the correct amount of bare copper. When they pinpoint the malfunctioning connector, it can be exchanged for a new one.
e195 – Critical
This critical error code can surface when the weather outside is severely hot. The HVAC system can break down and stop giving power to your Nest thermostat. When this problem persists, the backup battery in your thermostat drains and the thermostat will eventually power down. In the event the breakers are on, you can inspect a handful of other places before calling a professional technician.
Because this error can drain your thermostat’s battery, the first step may be restoring enough power to figure out if this specific error code is what you’re working with. You can separate the thermostat from its base and supply power by using 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 find anything wrong with these components, it will likely be best to contact a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical malfunction 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 can stem from the breaker box, an error from the control board or because of a faulty connection in the thermostat. Your technician needs to cautiously examine 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
Although this error code isn’t critical, it might still prevent you from using the Nest thermostat like normal. Error code n260 pertains to the lack of a C wire or Nest Power Connector, as not having one can block your Nest from getting enough power. You can examine 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.
During installation of a Nest Power Connector, you will sometimes 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 have 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 being delivered through the Nest’s wiring, it could damage internal components and could even be a fire hazard. If you see this error code pop up on your Nest thermostat and want to take steps to prevent 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 appropriate experience diagnosing and resolving 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 simple as the breaker being switched 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 check the wires to make sure they’re not loose or damaged. If nothing appears to be out of place, it’s a good idea to speak with a local professional.