Wyze Thermostat: Missing Y1 Error

[clemensstepho]

I’ve had my wyze thermostat setup for about 4 years now and just recently had an issue with the AC unit not turning on.

No changes were made to the wiring, it just stopped turning on.

I reset the device, disconnected and restarting the setup / pairing process. During this process I keep getting an error that says Y1 wire is missing. I believe this would prevent the AC unit from turning on?

Additionally, when I skip the error code, since I recognize the y1 is connected, when I get to the test stage, no air comes out of the vents.

As you can in the attached photo, the y1 wire is still connected to the thermostat terminal.

[clemensstepho]

Does anyone know what could cause this problem?

[speadie]

When you reset it did you tell it that you had a C wire or a G wire? Because you need to tell it that you have a G wire so that it knows you have a C adapter and outputs the correct signals.