It is possible that the micro switch below the ufo may be dislodged from the clip that holds it in place. This happens when little kids play with the ufo thingy lol

Thats it! My mother in laws was obstructed with grime inside the plunger assembly it was tricking the dishwasher into thinking it was empty all the time.

Most dishwashers have a float in the bottom of the tub. Possibly yours is faulty or obstructed in some way? Usually its just a plastic dome float with a electrical micro switch below the water.