Diagnosis
The formation of "shell-like" or hollow ice cubes in the Aglucky HZB-12B is a direct result of insufficient water volume reaching the evaporator fingers during the filling cycle. In a healthy unit, the water pump pushes a precise volume of water into the freezing chamber, filling the molds to the brim. When the ice is thin, it means the water is either draining too quickly or not filling the mold completely before the freezing cycle begins, leaving only a thin layer of ice clinging to the chilled metal pins. This is typically caused by mineral buildup (limescale) or debris obstructing the narrow water inlet nozzle or the internal pump filter. When calcium deposits narrow the aperture of the spray nozzle, the flow rate drops. Consequently, the sensor triggers the freezing process based on timing rather than volume, resulting in "ghost" cubes that lack a solid core. You can confirm this by listening to the pump; if you hear a strained humming sound but see only a trickle of water entering the mold, you have a blockage.
How to Fix It
To restore full cube density, you must perform a deep chemical descale of the water delivery system.
- Unplug the unit from the wall outlet and remove the ice basket and the removable water reservoir.
- Mix a solution of 50% distilled white vinegar and 50% warm distilled water in a separate container.
- Pour approximately 500ml of this solution directly into the water reservoir and slide it back into the machine.
- Locate the water spray nozzle—the small aperture located just above the evaporator fingers. Use a soft-bristled interdental brush or a thin pipe cleaner dipped in the vinegar solution to gently scrub the opening of the nozzle to remove hardened calcium flakes.
- Plug the unit in and run a "Clean" cycle if available, or simply start a standard ice-making cycle. Let the vinegar solution circulate through the pump and the evaporator for at least two full cycles.
- Drain the vinegar solution completely by removing the rubber drain plug located at the bottom of the machine.
- Fill the reservoir with fresh, filtered water and run one final cycle to flush out any remaining acetic acid smell.
If That Didn't Work
- Check the Water Level Sensor: If the sensor probes are coated in mineral film, the machine may "think" the reservoir is empty or full when it isn't, cutting the pump cycle short. Use a cotton swab dipped in rubbing alcohol to gently clean the two metal sensor prongs located inside the water tank area.
- Inspect the Pump Intake Filter: There is a small mesh screen where the pump draws water from the reservoir. If this is clogged with slime or sediment, the pump cannot move enough water to fill the molds. Use a toothpick to gently remove any debris from the mesh.
- Verify Ambient Temperature: If the room is excessively hot (above 90°F), the evaporator plate may not be reaching the critical temperature required to freeze the water quickly, causing the water to slide off the fingers before it can solidify, resulting in thin shells. Move the unit to a cooler area with at least 6 inches of clearance on all sides.
- Test Water Hardness: If you are using high-mineral tap water, the buildup happens almost instantly. Switch to bottled or RO (Reverse Osmosis) water for three cycles to see if the cube density improves. If it does, your local water is too hard for the standard pump flow.
Heads Up
- Avoid using dish soap or abrasive scrubbing pads on the evaporator fingers; scratching the coating can lead to "ice sticking," which prevents the cubes from dropping and can eventually bend the metal pins.
- Perform a vinegar descale every 30 days if you live in a hard-water area to prevent the nozzle from clogging permanently.
- Always ensure the rubber drain plug at the bottom is seated firmly; a slow leak here can cause the pump to suck in air, leading to inconsistent water levels and hollow cubes.
- Never use boiling water in the reservoir, as this can warp the plastic internal tubing and compromise the pump's seal.