Abstract: A control system for a tray type refrigerator ice maker having a motor driven programmer for controlling ice harvest by means of tray rotation and twist for ejecting cubes to a collector bin. The programmer also drives an arm for bin level sweep, which, if interrupted by the presence of accumulated bin ice, opens a cutout switch in series with the motor. A temperature sensing curie effect magnetic switch is series connected with the bin switch and motor for delaying harvest cycle motor drive until the surrounding tray temperature is sufficiently below freezing to indicate ice presence in the tray. A heater is series connected with the motor and disposed to cause opening of the temperature sensing switch shortly after motor start. A programmer actuated by-pass switch in parallel with the temperature sensing switch is held close to continue motor drive through the remainder of the harvest cycle.