Microwave produces unusual odors (chemical, plastic, or electrical) during operation.

Safety first: If the smell is strong and acrid (burning plastic or wiring), stop using the microwave and unplug it.

• New unit: For a new Hotpoint microwave, run it empty (or with a cup of water) for several short cycles to burn off manufacturing residues, following the manual.
• Clean interior: Thoroughly clean the cavity, door, and turntable components to remove old food and grease.
• Inspect externally: Remove the outer cabinet and look for discolored or melted plastic parts, especially near the magnetron, transformer, and wiring harness.
• Professional inspection: If you detect an electrical burning smell or see melted insulation, have a technician inspect and replace any overheated components.