Installing a Nest thermostat is one of the most convenient ways to optimize the everyday schedule of your heating and cooling. This smart thermostat can be taught your preferences and automatically make adjustments. But as you can expect, it won’t work well or at all if you see an error code on the display. The precise error code provides useful information about the source of the problem, something a trained technician can use to offer solutions that much faster.
Listed below are seven of the most frequent error codes you may discover on your Nest thermostat. We’ll walk you through the basics of each error code as well as how you might address it and the projected cost to do so. Remember that while the investment will ultimately hinge on the specific Nest model, you can anticipate paying between $75-$200 for repairs. This should include things like travel and labor costs on top of any specific parts 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 disconnected from the system. Because this is a critical power error, the thermostat will swap to the backup battery system. The error message will remain on display until the issue is resolved.
Losing power to your Nest thermostat can be for several reasons. The wiring could have disconnected or become damaged, or a disconnection could have appeared further along in your home’s electrical system. This could be the circuit breaker, fuse box or system switch. A certified technician can check electrical connections and wiring until they locate the source 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 complete a factory reset of your thermostat to make sure it’s not simply a software error. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start checking connectors.
They’ll shut off the power and slowly inspect each wire, making sure they are fully placed into the connector with the proper amount of uncovered copper. When they locate the damaged connector, it can be replaced for a new one.
e195 – Critical
This critical error code can appear when the weather outside is especially hot. The HVAC system can break down and stop sending 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 couple of other places before contacting a professional technician.
As this error can consume your thermostat’s battery, the first step might be supplying enough power to determine if this specific error code is what you’re dealing with. You can separate the thermostat from its base and provide power through a USB cable. Assuming it displays error code 195, you should continue to visually examine components like 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 will probably be best to call a pro.
e103 – Critical
Another critical error code, e103 signifies an electrical malfunction with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is receiving more power than necessary. This may stem from the breaker box, an error from the control board or because of a defective connection in the thermostat. The technician should cautiously inspect and test the Nest’s electrical system to understand where the power is surging or why the thermostat believes there’s an overcurrent problem.
n260
Although this error code isn’t critical, it may 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 missing 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 modify the wiring itself if there is. If not, you’ll need a Nest Power Connector.
During installation of a Nest Power Connector, you may notice error code E297 be displayed. This can be resolved 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
Just like error code e103, e104 is a critical error that’s the result of an overcurrent. If excess power is transported through the Nest’s wiring, it can damage internal components and may even be a fire hazard. If you notice 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 you can. You can then get in touch with a professional technician with the proper experience diagnosing and fixing electrical malfunctions.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not receiving power.
This could be as easy as the breaker being shut 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 seems to be out of place, it’s time to contact a local professional.
