Microwave produces an unusual chemical or plastic smell during operation, even when empty.

Safety note: A mild odor is normal for a new microwave during the first few uses. Strong burning smells are not normal.

Step-by-step checks:

• 1. Initial burn-in (new units): Heat a large bowl of water with lemon slices for 5–10 minutes to help remove new-appliance odors.
• 2. Clean thoroughly: Clean the cavity, door, and turntable with mild detergent to remove manufacturing residues or food spills.
• 3. Check ventilation: Ensure vents are clear and the unit has proper clearance.
• 4. Inspect internally (advanced): If the smell is strong and localized, a technician should inspect for overheated wiring, discolored plastic, or components running too hot.