Safety first: Allow the unit to cool before cleaning or internal inspection.

Do not overload: Cook in smaller batches and shake the basket halfway through cooking to improve evenness.
Clean basket holes: Ensure all perforations in the basket are clear of food residue.
Clean fan and heater: Remove grease and debris from the fan guard and heater area to restore proper airflow.
Check sensor location: Confirm the NTC sensor is correctly positioned to sense average cavity temperature, not pressed against a wall or shield.

Food cooks unevenly; some areas are burnt while others are undercooked.

Possible Causes