it's making a loud grinding or rattling noise, mostly during the harvest cycle when it twists the ice off.

Diagnosis

The grinding or rattling noise during the harvest cycle of the Aglucky HZB-12B is typically caused by mechanical interference during the rotation of the evaporator spikes. In this model, the harvest cycle involves a motor twisting the metal evaporator rods to release the ice cubes. When the noise occurs specifically during this phase, it indicates that the rotating assembly is either colliding with accumulated "ice bridges" (excess frozen water that has leaked and frozen outside the mold) or the plastic drive gear is slipping due to a lack of lubrication or a physical obstruction. Another common cause is the misalignment of the evaporator plate relative to the plastic housing. If the unit was bumped or if the internal supports have shifted, the metal spikes may be scraping against the interior plastic walls of the machine as they rotate. You can confirm this by observing the cycle through the top vent; if the noise coincides exactly with the moment the spikes begin to turn and you see the ice cubes struggling to drop, the issue is likely an ice blockage or a gear misalignment.

How to Fix It

To resolve the grinding noise, you must perform a deep mechanical reset and a full thermal defrost to clear any hidden obstructions.

1. Unplug the unit from the wall outlet immediately to prevent the motor from overheating while it is struggling against the obstruction.
2. Remove the ice basket and dump all remaining ice. Use a soft cloth and lukewarm water to wipe down the interior walls, specifically focusing on the area where the evaporator spikes meet the plastic casing.
3. Perform a "Deep Defrost": Leave the unit unplugged with the lid open for at least 3 to 4 hours. This ensures that any ice built up behind the plastic housing or inside the gear assembly—which isn't visible from the top—completely melts.
4. Inspect the evaporator spikes for any bent metal. If a spike is slightly skewed, it will rattle against the housing. Carefully straighten any bent rods using small needle-nose pliers, applying very gentle pressure to avoid snapping the metal.
5. Clear the drainage port. Use a pipe cleaner or a thin flexible wire to ensure the drain hole at the bottom of the reservoir is clear. If water backs up, it freezes around the rotating base, causing the grinding noise.
6. Dry the unit completely with a microfiber cloth, plug it back in, and run one full cycle without adding extra ice to the basket to ensure the rotation is smooth.

If That Didn't Work

• The gear motor drive assembly may have developed a flat spot or a stripped tooth. If the noise persists after a full defrost, the plastic gear that connects the motor to the evaporator plate is likely worn. This requires a partial teardleown of the chassis to inspect the white nylon gear. If you see plastic shavings (white powder) near the motor, the gear needs replacement.
• The internal refrigerant lines may have shifted, causing them to vibrate against the outer shell during the high-torque harvest phase. Check if the noise is a "metallic rattle" rather than a "plastic grind." If so, you can often dampen this by ensuring the unit is on a perfectly level, hard surface, as tilting the unit changes the center of gravity for the internal components.
• The water pump may be cavitating or sucking in air, which creates a rattling sound that mimics a gear grind. Try adding a small amount of distilled water and a teaspoon of white vinegar to the reservoir to clear any mineral scale buildup from the pump intake, which can cause erratic vibrations during the cycle transition.
• The unit may be suffering from "over-freezing" due to a faulty thermostat. If the ice cubes are too large or fused together, the motor will strain and grind to break them apart. Try lowering the ambient temperature of the room or moving the unit away from other heat-generating appliances to see if the harvest cycle becomes quieter.

Heads Up

• Never use sharp metal objects or screwdrivers to chip away ice from the evaporator spikes; you will puncture the refrigerant lines, which will permanently destroy the unit.
• Always use filtered water. Calcium and magnesium buildup from hard water create "scale" on the spikes, which increases friction and makes the harvest motor work harder, leading to premature gear wear.
• Ensure there is at least 6 inches of clearance around all sides of the machine. If the condenser coils overheat, the internal plastics can warp slightly, leading to the very scraping noises you are experiencing.
• Avoid overloading the ice basket. If ice piles up too high and touches the rotating spikes, it creates an immense amount of torque resistance, which can strip the plastic drive gears instantly.