the ice cubes from my della are really thin and hollow, like shells, they melt instantly

Diagnosis

Thin, hollow, or "shell-like" ice cubes in a Della Portable Ice Maker are almost always the result of an insufficient water volume being pumped into the freezing mold during the filling phase. In these units, the water pump operates for a precise number of seconds to fill the trays. If the pump is struggling or the water flow is restricted, the mold only partially fills. When the freezing cycle begins, the outer edges freeze first, trapping a small amount of water in the center that eventually freezes into a thin, fragile shell rather than a solid bullet.

This is typically caused by one of three things: mineral buildup (scaling) in the small internal intake tubes, air bubbles trapped in the pump line (vapor lock), or an overheating compressor that cannot maintain the necessary temperature to freeze the core of the cube. You can confirm this by observing the filling cycle; if you don't see the water reach the top of the mold's "fingers" before the cooling cycle starts, you have a flow issue. If the water level looks correct but the ice is still thin, your ambient room temperature is likely too high, preventing the unit from reaching the required -10°F to -15°F internal temperature needed for solid cores.

How to Fix It

To resolve the flow restriction and restore solid ice production, follow these precise steps to deep-clean the system and reset the pump:

1. Perform a Vinegar Flush: Mix a solution of 50% white distilled vinegar and 50% warm water. Pour 2 liters of this solution into the reservoir. Run the machine through two full ice-making cycles. The acetic acid breaks down the calcium and magnesium deposits that clog the narrow pump intake.
2. Manual Pump Prime: To clear air pockets (vapor lock), fill the reservoir to the MAX line. While the machine is running, gently tilt the unit 15 degrees forward and backward. This movement helps displace air bubbles trapped in the pump housing, allowing water to flow freely into the trays.
3. Clear the Intake Screen: Use a cotton swab dipped in vinegar to scrub the small mesh filter located at the bottom of the water reservoir. Even a thin layer of slime or mineral scale here can reduce the GPM (gallons per minute) flow enough to cause hollow cubes.
4. Optimize Water Temperature: Replace any room-temperature water with chilled, filtered water (approx 40°F). Using cold water reduces the workload on the compressor, allowing the unit to reach the freezing threshold faster and create a denser ice structure.
5. Clear the Vent Space: Ensure there is at least 6 inches of open air space around the side and rear vents. If the condenser coils cannot dissipate heat, the refrigerant doesn't reach the necessary temperature to freeze the center of the cube.

If That Didn't Work

• Check for Refrigerant Leaks: If the unit runs continuously but the ice remains thin and slushy, there may be a micro-leak in the evaporator coils. Check for any oily residue around the base of the unit. If a leak is present, the compressor cannot reach the target temperature, and the unit will require professional servicing or replacement.
• Hard Reset the Control Board: Unplug the unit from the wall outlet for exactly 30 minutes. This allows the internal capacitors to discharge and the refrigerant pressures to equalize. Plugging it back in can sometimes reset the timing of the water pump cycle.
• Upgrade the Environment: Move the unit to a room with a temperature below 75°F. Portable ice makers are not designed for high-heat environments like garages or outdoors in summer; the ambient heat fights the cooling process, resulting in thin-walled ice.
• Inspect the Pump Impeller: If you hear a grinding or clicking noise during the filling phase, the pump impeller may be partially obstructed by a piece of plastic or scale. If you are comfortable with basic tools, remove the bottom panel and ensure the pump motor is spinning freely.

Heads Up

• Avoid Distilled Water: While it seems counterintuitive, using 100% distilled water can actually lead to "soft" ice that melts faster. A small amount of mineral content (from filtered tap water) helps the ice structure form more solidly.
• Empty the Basket Frequently: If you let the ice basket overflow, the "warm" ice at the top melts and drips back onto the freezing tray, which can disrupt the freezing cycle and lead to irregular, thin shapes.
• Monthly Descaling: To prevent the return of hollow cubes, perform the vinegar flush every 30 days, especially if you live in a hard-water area.
• Avoid Direct Sunlight: Never place the unit in direct sunlight. The UV heat hitting the plastic chassis raises the internal temperature of the coolant, drastically reducing the density of the ice produced.