An ice machine includes an evaporator with a plurality of individual ice-forming cells. Each ice-forming cell is open at a lower end. A water distributor is coupled to the evaporator and configured to deliver water to the upper end of each ice-forming cell. A refrigeration system in the ice machine is configured to cool each of the plurality of ice-forming cells, such that individual ice cubes are formed in each ice-forming cell. A water recirculation system includes a water collection unit positioned between the evaporator and a water sump. The water collection unit collects water flowing from the ice-forming cells in first and second chambers. A water detection probe is positioned in the second chamber. A harvest cycle is initiated when the water level in the second chamber falls below a specified level. A method of operating the ice machine is also provided.