Edit: can’t believe I didn’t describe the issue. The thermostat itself is just unresponsive, blank screen. It’s not receiving power. It doesn’t appear to be a model with batteries btw, as I see no way to open any of the back portion of it.

Edit 2Am I an idiot? I don’t see a battery compartment anywhere:

https://ibb.co/hYDhVYH

Also I can see from the voltmeter that the C-R labeled wiring is receiving roughly the required voltage. https://ibb.co/Yfh5W1C

Heading to the hardware store to buy a multimeter.

I threw some circuit breakers in the house last night while investigating a light, but they all should’ve just been in the kitchen.

The user manual says nothing of real value to me. I’ve thrown the AC, heater, and other circuit breakers. Anything I can do other than check with a multimeter and then call a technician?

https://digitalassets.resideo.com/damroot/Original/10014/33-00182EFS.pdf?_ga=2.88827611.1567563007.1669391413-594870340.1669391413