Ac just shut off and thermostat went black. Checked the circuit breaker and that' fine. What else could it be?

Battery in the 'stat? Checked or changed?

I am experiencing the same issue. There are no batteries in the Bryant Evolution Thermostat/Control. I have flipped breakers, checked internal fuses on the furnace and AC, and replaced the stat with a new one. I am still without AC - still no power to my Bryant Evolution Thermostat/Control. I am going on the third repair guy now to see if he can figure it out. Any input on a resolution to this is appreciated!

I'm having the same problem. Any chance you got yours fixed or figured out what the problem is? I was told $830 for someone to replace the thermostat for me or $480 for a new one with no warranty. I'd really like to just buy a cheap one at least for the winter if I know that's all it is.

Check the GFI outlet that the condensate collector (little black and red box) is plugged into. If that trips, it shuts down the furnace.