An automatic residential refrigerator ice maker determines when to drop and harvest ice cubes using a built-in bimetal thermostat sensor, a thermistor, or a digital control board timer linked to the mold temperature. Once the water in the mold tray freezes solid and the surrounding temperature drops down to the proper sub-zero threshold (typically around fifteen degrees Fahrenheit), the thermostat closes an electrical circuit or signals the microchip control board. This triggers the mold heating element to warm slightly and activates the harvest motor. You can troubleshoot temperature settings using a standalone thermometer. You can verify that your sensor is working correctly when reaching the proper freezing threshold initiates the harvest cycle automatically, causing the ejector blades to sweep ice into the storage bin.
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