ice maker runs but the cubes are super thin and hollow, they melt instantly.

Diagnosis

The production of thin, hollow, or "shell-like" ice cubes in the Kismile Countertop Bullet Ice Maker typically indicates a failure in the water-to-cooling ratio. In a healthy cycle, the pump should inject a precise volume of water into the freezing prongs (evaporator pins) just as they reach the target temperature. If the cubes are hollow, the pump is either under-delivering water or the water is being displaced by air bubbles, leaving the center of the bullet empty. Another primary cause is "thermal lag." If the input water is too warm (above 75°F), the refrigerant cannot pull heat away fast enough. The exterior of the cube freezes instantly, creating a thin wall of ice that traps warm water inside. Because the core never fully freezes, the resulting cube is structurally weak, contains a pocket of liquid, and melts almost immediately upon contact with room-temperature air. You can confirm this by weighing a "thin" cube against a standard commercial cube; a significant weight deficit confirms a volume delivery issue rather than just a temperature issue.

How to Fix It

To resolve this, you must optimize both the fluid temperature and the internal pump efficiency. Follow these steps precisely:

1. Implement Chilled Input: Empty the reservoir and refill it with filtered water that has been chilled in a refrigerator to approximately 40°F–50°F. This reduces the workload on the compressor and ensures the water freezes from the outside-in more uniformly.
2. Perform a Deep Descale: Mineral buildup (calcium/magnesium) inside the small pump intake and the evaporator pins can restrict water flow. Mix a solution of 50% white distilled vinegar and 50% warm water. Fill the reservoir to the max line and let it sit for 60 minutes. Run one full ice-making cycle, then discard the ice.
3. Clear the Intake Filter: Locate the small mesh filter at the bottom of the water reservoir. Use a soft toothbrush to scrub away any biofilm or sediment that may be throttling the pump's intake capacity.
4. Optimize Ambient Airflow: Ensure there is at least 6 inches of open space on all sides of the unit. If the Kismile is tucked under a cabinet or pushed against a wall, the condenser coils cannot shed heat, raising the internal temperature and resulting in "soft" ice.
5. Reset the Cycle: Power the unit off, unplug it for 10 minutes to allow the refrigerant to stabilize, then restart it using the chilled water.

If That Didn't Work

• Check for Air Locks: If the pump makes a loud rattling sound but the cubes remain hollow, air may be trapped in the line. Gently tilt the machine 15 degrees to the left and right while the pump is running to help "burp" the air bubbles out of the water line.
• Inspect the Evaporator Pins: Look closely at the metal prongs. If you see a white, chalky residue that didn't come off with vinegar, use a cotton swab dipped in a stronger citric acid solution to manually scrub the pins. Any coating on these pins acts as an insulator, preventing the water from freezing solidly.
• Verify Voltage Stability: If the unit is plugged into a crowded power strip or an extension cord, the compressor may be under-volted, leading to insufficient cooling power. Plug the Kismile directly into a dedicated 120V wall outlet to ensure the compressor reaches maximum RPM.
• Test with Distilled Water: If you are in a hard-water area, try one full cycle with distilled water. If the cubes suddenly become solid, your local water chemistry is causing "flash-freezing" shells that prevent the core from solidifying.

Heads Up

• Avoid Hot Water: Never use hot or warm water to "clean" the reservoir while the machine is in cooling mode, as this can cause thermal shock to the evaporator pins.
• Daily Emptying: Always empty the reservoir and refill with fresh water every 24 hours. Stagnant water develops a biofilm that can clog the pump intake, leading to the exact "thin cube" issue described.
• Avoid Overfilling: Do not exceed the "MAX" line. Overfilling can occasionally cause pressure issues in the reservoir that interfere with the pump's ability to draw a consistent volume of water.
• Storage Warning: If not using the machine for more than three days, drain all water completely and leave the lid open to prevent mold growth in the pump assembly.