Wife found the control setting flashing. Lights out. Normally (default) is 0°F for freezer side and 37°F for fresh food side. Lights were off. Power is on as I can get the lights back on and hear what seems like a normal running unit. I can't get the control off/on button to get a complete reset nor am I able to adjust the temps when trying. The up and down will not change when trying to do so.
This unit does not have a total reset button for alarms like some models of the same vintage do.
The temp control setting acts like it resets, lights come back on (fresh food side) and then goes back to 0°F for both sides. Freezer side "seems" normal to me (lights on).
Unplug this critter for a short while? Control board or something - as I RTFM :)
...Controls Parts for Frigidaire FSC23F7DSB3
No lightning storms today. No power outages, etc.