Microwave produces sparks or arcing inside the cavity during cooking.

Safety: Immediately stop the microwave if you see sparks. Unplug the unit and allow it to cool before inspection.

User steps:

• 1. Remove metal objects: Ensure there is no metal cookware, twist ties, or foil touching the cavity walls.
• 2. Clean thoroughly: Wipe the interior with a mild detergent to remove grease and burnt food. Pay special attention to corners and around the waveguide cover.
• 3. Inspect waveguide cover: The small mica or plastic panel on the side or top wall should be intact and clean. If it is burned, cracked, or has holes, it must be replaced.
• 4. Check cavity paint: Look for chipped or bare metal areas. Touch up with microwave-safe cavity paint if recommended by Blomberg, or have the cavity professionally repaired.