Microwave makes a crackling or popping sound and may show sparks inside the cavity.

Immediate action: Stop the microwave and unplug it. Do not continue to run it while arcing occurs.

Internal cavity inspection:

• Remove all items from the cavity, including racks and accessories.
• Inspect the waveguide cover (usually a small rectangular panel on the side or top interior) for burns, holes, or heavy grease.
• Look for metal objects, twist ties, or foil that may have been left inside.
• Check for heavy, dried-on food splatter or grease, especially near the waveguide cover.

Cleaning and repair:

• Clean the cavity thoroughly with a mild detergent and soft cloth; remove all carbonized food.
• If the waveguide cover is burned or damaged, replace it with the correct Magic Chef waveguide cover.
• Touch up small paint chips or rust spots with microwave-safe cavity paint to prevent further arcing.

Test: After cleaning and replacing damaged parts, run the microwave with a cup of water and observe for any further arcing.