Microwave emits a strong chemical, plastic, or electrical burning smell during first uses or after a long period of disuse.

Safety: If you see smoke or the smell is very strong and persistent, stop using the microwave and unplug it.

User-level steps:

• 1. Initial burn-in: For new or long-unused units, run the microwave empty on LOW power for a few minutes with a cup of water inside, then ventilate the kitchen. For grill/convection, run those modes per the manual's initial burn-in instructions.
• 2. Clean interior: Wipe the cavity, door, and accessories with a mild detergent solution and dry thoroughly.
• 3. Ventilate: Open windows or use an exhaust fan during initial uses.

If the smell persists after several uses and cleanings, or if it smells like burning plastic or wiring, discontinue use and have a technician inspect internal components such as the wiring harness, magnetron, and heater elements.