it's making a loud grinding or rattling noise when it's trying to drop the ice into the basket

Diagnosis

The loud grinding or rattling noise in the Costway EP24744US occurs during the harvest cycle, specifically when the motor engages the plastic ejector spirals to twist the ice cubes out of the evaporator plate. This noise is typically caused by "ice bridging," where a cube has frozen to the side of the mold or failed to release during a previous cycle. When the motor attempts to rotate the spiral blades, it forces the plastic against a frozen obstruction, creating a high-pitched grinding sound or a rhythmic rattling as the motor struggles against the resistance.

Another common cause is the accumulation of mineral scale (calcium buildup) on the silver evaporator pins. When scale builds up, the ice doesn't slide off the pins smoothly; instead, it clings to the metal. This forces the ejector blades to apply more torque than intended, causing the internal gears to strain or the plastic blades to vibrate violently against the ice mass. You can confirm this by observing the harvest cycle: if the noise occurs only for 5-10 seconds while the blades are turning and then stops once the ice drops, it is a mechanical obstruction issue.

How to Fix It

To resolve this, you must clear the mechanical path and reset the harvest mechanism. Follow these steps precisely:

1. Unplug the unit from the wall outlet and remove the ice basket to get a clear view of the evaporator plate.
2. Open the top lid and inspect the silver evaporator pins. If you see a "stuck" cube or a shard of ice wedged between the plastic spiral and the metal plate, do not use a metal knife or screwdriver, as this will puncture the refrigerant lines.
3. Use a plastic utensil or a warm, damp cloth to gently melt and remove any ice remnants clinging to the evaporator pins or the sides of the mold.
4. Gently rotate the plastic ejector blades by hand in a clockwise direction. They should move smoothly. If you feel a "catch," continue to rotate slowly until the obstruction clears.
5. Clean the evaporator pins using a solution of 50% white vinegar and 50% warm water. Dip a soft cloth in the solution and wipe the silver pins to remove mineral deposits that cause ice to stick.
6. Rinse the area with fresh water, dry it with a lint-free cloth, and replace the ice basket.
7. Plug the unit back in and run one full cycle to ensure the noise has subsided.

If That Didn't Work

• Perform a Hard System Reset: Unplug the machine for at least 30 minutes. This allows any internal "ghost" ice—small slivers frozen inside the mechanical housing—to melt completely, which often clears the path for the ejector blades.
• Check Water Level and Quality: Low water levels can cause "thin" cubes that don't have enough mass to be pushed out cleanly, causing the blades to rattle. Ensure the reservoir is filled to the "Max" line. If you have very hard water, switch to distilled water for three cycles to see if the noise disappears, confirming mineral buildup as the cause.
• Inspect the Drive Gear: If the grinding persists and sounds metallic, the plastic gear connecting the motor to the spiral blades may be stripped or misaligned. Check for any plastic shavings at the bottom of the unit; if found, the drive assembly may need replacement.
• Adjust Ambient Temperature: If the machine is placed in an extremely cold room (below 60°F/15°C), the ice may freeze too aggressively to the plate. Move the unit to a warmer area to allow the harvest cycle to function with less resistance.

Heads Up

• Never use sharp metal objects to clear ice from the evaporator plate; a single puncture in the silver lining will leak refrigerant and permanently destroy the unit.
• Run a descaling cycle with white vinegar once every two weeks to prevent the mineral buildup that leads to "sticky" ice and motor strain.
• Avoid overfilling the ice basket; when the basket is too full, the ice cannot drop freely, causing the ejector blades to push against a wall of ice, which triggers the grinding noise.
• Always ensure the unit is on a completely level surface. An angled machine causes ice to freeze unevenly, leading to off-center cubes that jam the spiral ejectors.