Operating a Nest thermostat is one of the most convenient ways to optimize the daily schedule of your HVAC system. This smart thermostat can recognize your preferences and automatically make adjustments. But as you may expect, it won’t work properly or at all if you see an error code appear. The precise error code supplies useful information about the source of the problem, something a professional technician can use to offer solutions that much quicker.
Let’s consider seven of the most likely error codes you may discover on your Nest thermostat. We’ll review the basics of each error code on top of how you can solve it and the projected cost to do so. Keep in mind that while the costs will ultimately hinge on the precise Nest model, you can count on paying about $75-$200 for repairs. This should include travel and labor costs as well as any specific components required to finish repairs.
e298 – Critical
This critical error code is limited to newer models of the Nest thermostat and appears when the power is shut off. As this is a critical power error, the thermostat will change 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 might have disconnected or become damaged, or a disconnection might have occurred further along in your electrical system. This might be the circuit breaker, fuse box or system switch. A certified technician can examine electrical connections and wiring until they uncover the source of the problem.
e294 – Critical
Critical error code e294 appears when your Nest thermostat’s wiring has to be reconfigured. More specifically, the technician should reconfigure the R wire. They’ll first perform a factory reset of your thermostat to ensure it’s not just a software issue. If that doesn’t work, they’ll check the wiring diagram of the thermostat and start checking connectors.
They’ll detach the power and progressively look at each wire, making sure they are fully inserted into the connector with the correct amount of exposed copper. After they find the malfunctioning 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 lingers, the backup battery in your thermostat drains and the thermostat will subsequently power down. In the event the breakers are on, you can inspect a few other places before calling a professional technician.
Because 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 dealing with. You can detach the thermostat from its base and deliver power through a USB cable. In the event it presents 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 detect anything wrong with these components, it will likely be best to contact a pro.
e103 – Critical
Another critical error code, e103 suggests an electrical issue with your Nest thermostat. More specifically, e103 can refer to an overcurrent problem, which means the wiring is getting more power than necessary. This will sometimes stem from the breaker box, an error from the control board or because of a defective connection in the thermostat. The technician should meticulously inspect and test the Nest’s electrical system to understand 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 may still stop you from using the Nest thermostat how you want to. Error code n260 concerns the lack of a C wire or Nest Power Connector, as missing one can block your Nest from receiving enough power. You can check 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.
With installation of a Nest Power Connector, you might notice error code E297 show up. This can be remedied 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
Similar to error code e103, e104 is a critical error stemming from an overcurrent. If too much 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 pop up on your Nest thermostat and want to take steps to prevent electrical damage, it’s suggested to shut the power off as soon as you can. You can then get a hold of a professional technician with the appropriate experience diagnosing and solving electrical issues.
e73 – Critical
When your thermostat displays error code e73, it signifies that the Rc wire is not receiving power.
This may be as easy as the breaker being shut off, but it could also be something with the wiring. After switching off the power to your HVAC system and thermostat, you can visually examine the wires to make sure nothing is loose or damaged. If nothing seems to be out of place, it’s time to get in touch with a local professional.