Microwave interior is sparking or arcing during cooking; bright flashes may appear on the walls or near the waveguide cover.

Safety: Stop the microwave immediately and unplug it if you see sparks or arcing.

• Remove metal: Ensure no metal utensils, foil, or twist ties are inside the Viking microwave.
• Inspect waveguide cover: Locate the mica or plastic waveguide cover on the side or top interior wall. If it is burned, cracked, or has holes, it must be replaced.
• Clean cavity: Thoroughly clean the interior, especially around the waveguide cover, to remove grease and food splatter that can cause arcing.
• Touch up paint: If cavity paint is chipped down to bare metal, use a microwave-safe cavity touch-up paint to cover exposed metal after cleaning and drying.
• Replace waveguide cover: Install a new Viking waveguide cover cut to the correct size and shape for your model.
• Test carefully: After repairs, test with a cup of water and observe for any further arcing.