DIAGNOSIS Overcrowding the basket. This blocks air circulation, which is the core cooking mechanism. Moisture cannot escape.
FIX Cook in single, even layers. Do not stack or pile food. Shake the basket vigorously at the halfway point of cooking. For frozen fries, use 400°F for 12-15 minutes. Shake at the 6-minute mark. Ensure the basket is dry before adding food.
IF THAT DIDN'T WORK Verify the heating element is functioning. Run the air fryer empty at 400°F for 3 minutes. You should feel intense, consistent heat from the top vent. If not, the heating element may be faulty.
HEADS UP Pat wet food dry with a paper towel before cooking. Adding a light mist of oil (using a pump sprayer, not aerosol) can significantly improve crispiness for vegetables and potatoes.