ice maker says it's making ice but the basket is empty after hours. it just keeps running cycles and dumping water.

Diagnosis

The core issue is a failure in the thermal exchange process. While the control board is triggering the cooling cycle (which is why you hear the compressor and fan running), the evaporator plates are failing to reach the critical freezing point necessary to solidify the water. Instead of freezing, the water remains liquid; when the timer hits the "harvest" phase, the machine assumes ice has formed and dumps the liquid water back into the reservoir, creating an endless loop of empty cycles. This is typically caused by "thermal saturation" or insufficient heat dissipation. If the internal condenser coils cannot shed heat into the surrounding air, the refrigerant cannot cool the evaporator plates. This happens frequently if the unit is placed too close to a wall, sitting on a heat-generating surface (like a microwave or dishwasher), or operating in a room where the ambient temperature exceeds 85°F. Another common cause is a "priming" failure where air pockets in the refrigerant lines prevent the cooling agent from circulating efficiently, often occurring if the unit was tilted during transport or turned on immediately after being moved.

How to Fix It

To resolve the cooling failure and restore ice production, follow these precise steps to reset the thermal equilibrium of the machine:

1. Complete Power Flush: Unplug the power cord from the wall outlet. Do not just turn it off via the control panel. Leave the unit unplugged for exactly 30 minutes to allow the refrigerant pressures to equalize and the compressor to cool down completely.
2. Optimize Ventilation: Move the machine to a hard, flat surface. Ensure there is a minimum of 6 inches (15cm) of open air space on all sides and the rear of the unit. If it is currently inside a tight cabinet or pushed against a backsplash, move it to an open countertop.
3. Reservoir Reset: Drain all existing water from the reservoir. Wipe the interior walls of the reservoir with a clean cloth to remove any mineral buildup that might be affecting water flow. Refill the reservoir with fresh, filtered water—do not fill it past the "MAX" line, as overfilling can interfere with the water pump's ability to push water onto the freezing pins.
4. Thermal Stabilization: Ensure the room temperature is between 60°F and 80°F. If the room is too hot, run a fan or air conditioner to lower the ambient temperature before restarting.
5. The First Cycle Test: Plug the unit back in and press the "Start" button. Close the lid completely and do not open it for at least 15 minutes. This allows the machine to complete two full cycles without introducing warm room air into the freezing chamber.

If That Didn't Work

• Check for Scale Buildup: If you have hard water, calcium deposits can coat the evaporator pins, acting as an insulator that prevents the cold from reaching the water. Mix a solution of 2 tablespoons of white distilled vinegar with 1 quart of warm water. Pour it into the reservoir and run the "Auto-Cleaning" cycle. Let the solution sit for 10 minutes before finishing the cycle and rinsing with fresh water.
• Verify Fan Operation: Listen closely to the back of the unit. You should hear a distinct whirring sound from the condenser fan. If the compressor is humming but the fan is silent, the unit will overheat and stop freezing within minutes. Check for dust or pet hair clogging the rear vents and clear them with a vacuum or compressed air.
• Refrigerant Settling: If the unit is brand new, it may have a "gas lock." Turn the machine completely upside down for 5 minutes, then right-side up, and let it sit unplugged for 24 hours. This ensures the refrigerant oil has settled in the compressor and not blocked the capillary tubes.
• Water Level Sensor Calibration: Sometimes the sensor misreads the water level, causing the pump to deliver too little water to the pins, which then evaporates rather than freezes. Ensure the machine is perfectly level using a bubble level; a slight tilt can cause the sensor to malfunction.

Heads Up

• Avoid Distilled Water: Using 100% distilled water can actually lead to poor ice formation because the lack of minerals can occasionally interfere with the sensors and the freezing process. Use filtered tap water for best results.
• Lid Discipline: Opening the lid frequently to "check" if ice is forming introduces warm, humid air that raises the temperature of the evaporator plates, often causing the current cycle to fail.
• Avoid Overloading: Once the basket is 75% full, the ice cubes begin to touch the cooling pins. This can cause the cubes to fuse together and may trigger the "Ice Full" sensor prematurely or slow down the cooling efficiency.
• Cleaning Frequency: Run the auto-cleaning function once every two weeks to prevent biofilm and mineral buildup on the freezing elements, which is the leading cause of long-term cooling degradation.