Oven emits a high-pitched whine or humming noise from the control area during operation.

Safety first: Disconnect power before tightening any internal components.

• 1. Isolate source: Listen carefully to determine whether the noise comes from the fan, transformer area, or a vibrating panel.
• 2. Tighten fixings: Remove the top cover and gently tighten screws securing the control board, transformer, and metal shields.
• 3. Check cooling fan: Ensure the cooling fan blades are clean and the motor is firmly mounted.
• 4. Damping: In some cases, adding manufacturer-approved damping pads or washers under panels can reduce resonance.

If the noise is accompanied by burning smell or erratic operation, discontinue use and seek service.