Visible sparks or arcing inside the microwave cavity during cooking.

Safety: Stop the microwave immediately if you see sparks. Unplug before cleaning or inspection.

• Step 1 – Remove metal items: Ensure no metal cookware, foil, or utensils are inside. Use only microwave-safe containers.
• Step 2 – Clean the cavity: Wipe the interior thoroughly with a mild detergent solution, focusing on the area around the waveguide cover. Remove all grease and food splatters.
• Step 3 – Inspect waveguide cover: Check the mica waveguide cover (usually a small rectangular panel on the side wall). If it is burnt, cracked, or has holes, replace it with a Swan-compatible waveguide cover.
• Step 4 – Check for exposed metal: Look for chipped paint or rust exposing bare metal. Touch-up with microwave-safe cavity paint if minor; if severe, consult a technician.

Do not operate the microwave with a damaged or missing waveguide cover.