Why Ice Cubes Are Too Small? Check the ice maker. Is it leveled? Check the fill tube. Is it frozen? Check the water supply. Check the ice maker water valve. Check the water pressure: Is it between 20 and 120 psi? Check for a self-piercing saddle valve. Mineral deposits will restrict the opening. Cycle the ice maker, and catch the fill water in a glass. Measure the amount of water. Are there at least 140 cc of water in the glass? Test for openings in the mold heater. Check the ice maker thermostat. There might be insufficient thermal bond between the thermostat and the ice maker mold. Still having an issues?