In the ice-making state, when the evaporator plate temperature drops below a sub-freezing setpoint (set by the front-panel ice-thickness control), the unit switches to the harvesting state, reversing the refrigeration and thus heating the plate so that the ice slab thaws slightly and slides ...
all in all, i am very pleased. the only reason i did not give it 5 stars is the ice maker has gotten off to a slow start. at about two weeks in it is still making very small ice pellets and not in great quantity. perhaps the installer did not properly purge the water line....