Using a Nest thermostat is one of the best ways to perfect the daily schedule of your heating and cooling. This smart thermostat can recognize 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 appear. The specific error code offers useful information about the root of the problem, something a knowledgeable technician can use to offer solutions that much sooner.
Listed below are seven of the most frequent error codes you might discover on your Nest thermostat. We’ll explain the basics of each error code along with how you can address it and the estimated cost to do so. Remember that while the investment will ultimately depend on the precise Nest model, you can expect to pay between $75-$200 for repairs. This should include things like travel and labor costs along with any specific parts necessary to finish 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 change to the backup battery system. The error message will remain on display until the issue is dealt with.
Losing power to your Nest thermostat can be for several reasons. The wiring could have disconnected or become damaged, or a disconnection might have happened further along in the electrical system. This might be the circuit breaker, fuse box or system switch. A certified technician will 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 needs to be reconfigured. More specifically, the technician will need to reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to ensure it’s not simply a software problem. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start inspecting connectors.
They’ll disconnect the power and slowly inspect each wire, seeing to it that they are fully inserted into the connector with the proper amount of uncovered copper. When they find the malfunctioning connector, it can be replaced for a new one.
e195 – Critical
This critical error code can surface when the weather outside is severely hot. The HVAC system can shut down and stop sending power to your Nest thermostat. When this problem lasts, the backup battery in your thermostat drains and the thermostat will eventually shut down. In the event the breakers are on, you can check a few other places before calling a professional technician.
Because this error can drain your thermostat’s battery, the first step might be restoring enough power to determine if this specific error code is what you’re facing. You can disconnect the thermostat from its base and supply power by using a USB cable. In the event 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 struggle to find anything wrong with these components, it’s maybe best to get in touch with a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical error with your Nest thermostat. More specifically, e103 may refer to an overcurrent problem, which means the wiring is experiencing more power than needed. This may stem from the breaker box, an error from the control board or thanks to a defective connection in the thermostat. A technician needs to cautiously investigate and test the Nest’s electrical system to determine where the power is surging or why the thermostat thinks there’s an overcurrent problem.
n260
Even though this error code isn’t critical, it might still prevent you from using the Nest thermostat how you prefer 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 receiving enough 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.
Due to installation of a Nest Power Connector, you may notice error code E297 be displayed. 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
Just like error code e103, e104 is a critical error that’s the result of an overcurrent. If excessive power is being delivered using the Nest’s wiring, it can damage internal components and may even be a fire hazard. If you notice this error code pop up on your Nest thermostat and want to protect from electrical damage, it’s suggested to shut the power off as soon as possible. You can then get a hold of a professional technician with the appropriate experience detecting and fixing electrical problems.
e73 – Critical
When your thermostat displays error code e73, it means that the Rc wire is not getting power.
This could be as easy as the breaker being turned off, but it can also be a problem with the wiring. After shutting off the power to your HVAC system and thermostat, you can visually examine the wires to make sure none of them are loose or damaged. If nothing seems to be out of place, it’s a good idea to get in touch with a local professional.