it's making ice but the cubes are tiny and hollow or look like slush, not solid squares.

Diagnosis

This issue occurs when the thermal exchange between the aluminum freezing pins and the water is inefficient, preventing the water from freezing from the outside-in in a solid structure. When the water entering the mold is too warm, or the ambient air around the machine is too hot, the machine cannot pull heat away fast enough. This results in "shelling," where only the outer layer freezes quickly while the center remains liquid or slushy, leading to hollow or shrunken cubes. Furthermore, this is often exacerbated by mineral buildup (scale) on the freezing pins. Calcium and magnesium deposits act as an insulator, creating a physical barrier between the cold metal pin and the water. If you see white chalky residue on the pins or the bottom of the reservoir, the heat transfer is compromised, and the machine will struggle to produce solid, clear squares even if the water is cold.

How to Fix It

To resolve this and restore full-sized, solid ice cubes, follow these precise steps to optimize the thermal environment and clean the system:

1. Empty the current water reservoir completely. Scrub the bottom of the tank with a soft brush to remove any loose sediment.
2. Fill the reservoir with distilled or filtered water that has been pre-chilled in the refrigerator (ideally between 35°F and 42°F). Using room-temperature water forces the compressor to work harder and often results in the first 2-3 batches being hollow.
3. Ensure the machine has at least 6 inches of open air space on all sides. If the machine is pushed against a wall or tucked under a low cabinet, the condenser coils cannot dissipate heat, which raises the internal temperature of the freezing tray.
4. Power the machine on and let it idle for 15 to 20 minutes before initiating the first ice-making cycle. This allows the refrigerant to fully saturate the evaporator plates.
5. Set the machine to the "Fast" mode if available, but only after the initial chilling period. This ensures the compressor is running at maximum capacity to lock in the cube structure.

If That Didn't Work

• Perform a deep descaling cycle using a 50/50 mixture of white distilled vinegar and warm water. Fill the reservoir to the max line, let the solution sit for 30 minutes, and then run a full cycle. This removes the mineral scale from the freezing pins that inhibits heat transfer.
• Check the intake vent at the rear of the unit for dust accumulation. Use a vacuum or compressed air to clear the vents. If the fan cannot pull air through the condenser, the freezing pins will never reach the sub-zero temperatures required for solid cubes.
• Verify your water hardness. If you are using hard tap water, the "slushy" consistency is often caused by dissolved solids preventing a clean crystalline structure. Switch to bottled purified water for three cycles to see if the cube density improves.
• Inspect the rubber gasket around the freezing tray. If the seal is leaking or warped, cold air escapes and warm air enters the mold area, causing the ice to melt from the inside out during the freezing process.

Heads Up

• Never use boiling or hot water to clean the reservoir while the machine is powered on, as this can cause thermal shock to the aluminum freezing pins and lead to permanent warping.
• Avoid filling the reservoir past the "MAX" line; overfilling can lead to water seepage into the motor housing or uneven ice distribution across the pins.
• Clean the ice basket and the interior walls weekly with a damp cloth to prevent biofilm buildup, which can affect the taste and clarity of the ice.
• If you live in a high-humidity environment, run a dehumidifier in the room; high ambient humidity makes the condenser coils work significantly harder, reducing the overall ice density.