it takes forever to make ice now, like 20 minutes for a few cubes, used to be much faster

Diagnosis

The Newair AI-100SS is experiencing a significant drop in thermal efficiency, typically caused by calcium and magnesium carbonate buildup on the evaporator prongs. Because this model uses a direct-contact freezing method where water is splashed onto cold metal fingers, any mineral film creates a thermal barrier. This "scaling" acts as an insulator, preventing the refrigerant in the evaporator from rapidly absorbing heat from the water. Instead of the water freezing instantly upon contact, it lingers on the prongs, extending the cycle time from the standard 7-12 minutes to 20 minutes or more. You can confirm this by inspecting the evaporator prongs (the silver spikes) with a flashlight. If you see a white, chalky, or cloudy residue instead of a mirror-like polished finish, the unit is scaled. Additionally, if you notice the "Ice Full" sensor triggering prematurely or the cubes appearing smaller and more irregular than they were when the unit was new, it confirms that the heat exchange process is compromised.

How to Fix It

To restore the factory-speed freezing cycles, you must perform a deep chemical descale of the evaporator and the internal water lines.

1. Empty all existing ice from the basket and drain the water reservoir completely using the drain plug at the rear of the unit.
2. Mix a descaling solution: use 16oz of warm distilled water mixed with 4oz of food-grade citric acid powder or a commercial descaler. Avoid using straight white vinegar as it can leave a scent that permeates future ice batches.
3. Pour the solution into the water reservoir.
4. Initiate the automated cleaning mode by pressing and holding the "Ice Size" and "Power" buttons simultaneously for 5 seconds. The indicator light will flash to confirm the cycle has started.
5. Allow the unit to run through the full cleaning cycle. This process takes approximately 15-20 minutes as the pump circulates the solution through the evaporator.
6. Once the cycle finishes, drain the solution completely.
7. Fill the reservoir with fresh, filtered water and run two "test" cycles of ice production. Discard these first two batches to ensure all chemical residues are flushed from the prongs.

If That Didn't Work

• Check the Condenser Airflow: If the back vents are clogged with dust or the unit is pushed against a wall (less than 6 inches of clearance), the refrigerant cannot cool down. Use a vacuum or compressed air to clear the intake vents. If the condenser is overheating, the evaporator won't reach the critical temperature needed for fast freezing.
• Inspect the Water Pump: If the water is not being splashed onto the prongs with full force, the "blanket" of water is too thin or inconsistent. Listen for a humming sound; if the pump sounds labored, there may be a physical blockage in the pump intake. Flush the reservoir with a high-pressure water stream to clear debris.
• Verify Ambient Temperature: The AI-100SS is sensitive to room temperature. If the unit is sitting in a hot garage or next to a dishwasher/oven, the cooling cycle will naturally slow down. Move the unit to a cooler environment (below 75°F) to see if the cycle time returns to normal.
• Check the Refrigerant Level: If the prongs are clean and the airflow is clear, but the ice still takes 20+ minutes, the unit may have a slow refrigerant leak. Check if the sides of the machine feel unusually cool or if the compressor is running constantly without cycling off. If the compressor is hot but the prongs are barely cold, the unit requires professional recharging.

Heads Up

• Use Filtered Water: To prevent scaling from returning, always use distilled or filtered water. Tap water high in minerals will cause the unit to slow down again within 30-60 days.
• Monthly Maintenance: Perform a "light" descale once a month even if the unit seems to be working fine. This prevents the mineral layers from hardening into a crust that is harder to remove.
• Avoid Overfilling: Do not add ice to the basket manually to "speed things up." Overfilling the basket can trick the infrared sensor into thinking the unit is full, causing it to shut off prematurely.
• Power Cycle: If the machine glitches, unplug it for 10 full minutes to allow the internal pressures to equalize before restarting.