Using a Nest thermostat is one of the most convenient ways to perfect the daily schedule of your comfort system. This smart thermostat can be taught your preferences and automatically make changes. But as you may expect, it won’t work properly or at all if you see an error code on the display. The specific error code offers useful information about the underlying problem, something a trained technician can use to offer solutions that much faster.
Let’s consider seven of the most common error codes you may discover on your Nest thermostat. We’ll review the basics of each error code on top of how you can address it and the projected 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 include things like travel and labor costs on top of any specific parts needed to complete repairs.
e298 – Critical
This critical error code is limited to new models of the Nest thermostat and appears when the power is shut off. Because this is a critical power error, the thermostat will swap to the backup battery system. The error message will remain on the screen until the problem is fixed.
Losing power to your Nest thermostat can be for a number of reasons. The wiring could have disconnected or become damaged, or a disconnection could have occurred further along in your home’s electrical system. This could be the circuit breaker, fuse box or system switch. A knowledgeable technician can check electrical connections and wiring until they locate 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, you’ll need the technician to reconfigure the R wire. They’ll first conduct a factory reset of your thermostat to ensure it’s not just a software issue. If that doesn’t work, they’ll examine the wiring diagram of the thermostat and start looking at connectors.
They’ll shut off the power and gradually check each wire, making sure they are fully placed into the connector with the correct amount of exposed copper. Once they locate the problem connector, it can be swapped for a new one.
e195 – Critical
This critical error code can appear when the weather outside is particularly 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 finally shut down. Presuming the breakers are on, you can examine a handful of other places before consulting a professional technician.
As this error can deplete your thermostat’s battery, the first step may be supplying enough power to find out if this specific error code is what you’re facing. You can separate the thermostat from its base and supply power by using a USB cable. In the event it presents error code 195, you may continue to visually check components such as 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’s maybe best to call a pro.
e103 – Critical
Another critical error code, e103 indicates an electrical error with your Nest thermostat. More specifically, e103 can 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 faulty connection in the thermostat. A technician should carefully examine and test the Nest’s electrical system to determine where the power is surging or why the thermostat thinks there’s an overcurrent problem.
While this error code isn’t critical, it could 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 receiving sufficient power. You can inspect the Nest’s C connector for the presence of a C wire and adapt the wiring itself if there is. If not, you need a Nest Power Connector.
During installation of a Nest Power Connector, you will sometimes notice error code E297 be displayed. This can be dealt with by updating your thermostat in Settings -> Software -> Update. If the Power Connector is already installed, you’ll instead have to update the wiring info in the app from Settings -> Thermostat -> Wiring -> Update wiring.
e104 – Critical
Like error code e103, e104 is a critical error that’s the result of an overcurrent. If too much power is being delivered through 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 take steps to prevent electrical damage, it’s recommended to turn the power off as soon as possible. You can then get a hold of a professional technician with the appropriate experience identifying and resolving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it indicates that the Rc wire is not receiving power.
This will sometimes be as straightforward as the breaker being turned off, but it can also be an issue with the wiring. After turning off the power to your HVAC system and thermostat, you can visually check the wires to make sure nothing is loose or damaged. If nothing seems to be out of place, it’s time to contact a local professional.