Air fryer emits a high-pitched whine or electrical buzzing sound.

Safety first: Unplug the unit before opening the housing. Do not touch capacitors immediately after unplugging; they may retain charge.

Steps to reduce electrical noise:

• 1. Identify when noise occurs: Note if the noise is present only during heating, only when the fan runs, or continuously.
• 2. Inspect fan motor: If noise changes with fan speed, inspect and, if necessary, replace the fan motor.
• 3. Inspect main PCB: Open the housing and locate the power supply transformer or inductors. Ensure they are firmly mounted and that any securing glue has not cracked.
• 4. Tighten or re-secure components: Carefully tighten mounting screws or apply high-temperature-safe adhesive (if qualified) to reduce vibration.
• 5. Replace main PCB: If noise is accompanied by flickering display or erratic behavior, replace the main control board.

Warning: Persistent loud buzzing can indicate impending component failure; monitor closely or seek service.