Why Your Ice Maker Makes Small or Hollow Ice Cubes

Quick answer

Small or hollow ice cubes are usually caused by low water supply, clogged filters, or incorrect freezer temperature. Start by checking your water line pressure and cleaning the ice maker's filter. If the problem persists, inspect the water inlet valve and ensure the freezer stays at 0°F (-18°C) or colder.

Why ice cubes come out small or hollow

Ice makers rely on a steady flow of water into the mold. If the water pressure is too low (below 20 psi), the mold fills only partially, producing undersized cubes. A partially clogged water filter or a kinked supply line can cause the same issue.

Freezer temperature also matters. If the freezer is warmer than 0°F (-18°C), the ice freezes too slowly, allowing trapped air to form hollow centers. Conversely, a freezer that's too cold can cause the ice to freeze before the mold fills completely.

Over time, mineral deposits and mold can build up inside the ice maker, restricting water flow. Regular cleaning every six months helps prevent this. If you have hard water, consider using a water softener or a dedicated ice maker filter.

When to check the water inlet valve

The water inlet valve opens to let water into the ice mold. If the valve is partially stuck or has a weak solenoid, it may not open fully, reducing water volume. You can test the valve by disconnecting the water line and checking for consistent flow. If the flow is weak or intermittent, the valve likely needs replacement.

For portable ice makers like the Antarctic Star Nugget Ice Maker with Soft Chewable Pellet Ice 34lbs/24H, the water reservoir must be filled manually. If the reservoir runs low or the pump fails, the machine will produce small or hollow nuggets. Always check the water level indicator first.

How to fix small or hollow ice cubes

Start with the easiest fix: replace the water filter if your ice maker has one, and straighten any kinks in the supply line. Next, check the freezer temperature with a standalone thermometer and adjust the thermostat to 0°F (-18°C). Allow 24 hours for the ice to stabilize.

If the cubes are still small, clean the ice maker thoroughly. Use a manufacturer-approved cleaner or a vinegar solution to remove scale and biofilm. For stubborn mineral buildup, you may need to descale the water inlet valve.

For countertop nugget ice makers, such as the Antarctic Star Nugget Ice Maker with Soft Chewable Ice 44 Lbs/24H, ensure the drain plug is secure and the water pump is working. A failing pump will not circulate enough water, leading to hollow or misshapen nuggets.

Diagnosis: Small or Hollow Ice Cubes

• Symptom: Ice cubes are noticeably smaller than normal, or have a hollow center with thin walls. Check water supply and freezer temperature first.
• Likely cause: Low water pressure (below 20 psi), clogged filter, kinked line, or freezer temperature above 0°F (-18°C). Replace filter, straighten line, and verify temp with a thermometer.
• Corrective action: Clean the ice maker, descale the water inlet valve, and ensure the water reservoir is full (for portable units). If cubes improve after cleaning, continue regular maintenance every 6 months.
• When to stop or choose another option: If cubes remain hollow after cleaning and checking water flow, the water inlet valve or pump may be failing. Consider replacing the part or upgrading to a new ice maker. For persistent issues, a new unit like the Antarctic Star 44 lbs nugget ice maker may be more cost-effective than repeated repairs.

Products that can help

• Antarctic Star Nugget Ice Maker with Soft Chewable Pellet Ice 34lbs/24H: The nugget ice maker produces up to 34 pounds of pellet ice within 24 hours, ensuring a steady supply of fresh, high-quality ice for your home, parties, or gatherings. If your current ice maker struggles with water flow, a dedicated countertop unit with a visible water reservoir makes troubleshooting easier and reduces the risk of hollow cubes.
• Antarctic Star Nugget Ice Maker with Soft Chewable Ice 44 Lbs/24H: Designed for efficiency, this machine produces soft, chewable nugget ice in just 15 minutes and can make up to 44 pounds of ice in 24 hours. A self-dispensing model eliminates scooping and reduces the chance of contamination that can clog water pathways and cause small ice.