Is the Aroma rice cooker reset really just an unplug cycle?

yeah that's the one. It's a curie point magnet, when the rice reaches around 100C the magnetic switch loses its grip on the metal and the spring snaps the relay open. It wears out after 40 years of repeated spring action and arcing at the metal contacts. Classic failure.

curie point magnet on a rice cooker is the kind of trivia I came here for
 
alot of people dont realize the digital aromas with the LCD will sometimes seem stuck because they're in delay timer mode not because they're broken. Press cancel and hold it for a few seconds.
 
To answer your actual question OP: yes, if unplug doesn't fix it you're looking at hardware. Thermal fuse first, then the magnetic thermostat, then the heating element itself, board last. That's the order of likelihood.
 
To answer your actual question OP: yes, if unplug doesn't fix it you're looking at hardware. Thermal fuse first, then the magnetic thermostat, then the heating element itself, board last. That's the order of likelihood.

board failure is super rare on these. Ive been fixing small appliances for 15 years and ive maybe seen 2 dead control boards on rice cookers ever. Its always the fuse or the thermostat.