If you experience popping sounds and see lightning-like sparks inside your microwave oven while cooking, it indicates a potential safety issue that needs to be addressed immediately. This behavior could be caused by several factors:
Metallic objects: The most common reason for sparking in the microwave is the presence of metallic objects inside the oven. Metals reflect microwave radiation, and when microwaves encounter metal, they can cause the electric charges to accumulate and discharge, leading to sparks. This can be dangerous and may damage the microwave. Never put any metal objects, aluminum foil, or dishes with metallic elements into the microwave.
Damaged waveguide cover: The microwave's interior is lined with a waveguide cover made of Mica or other materials that protect the magnetron from food splatters and debris. If this cover is damaged, it can cause sparking inside the microwave. Inspect the waveguide cover for any signs of wear, burns, or damage and replace it if needed.
Contaminated interior: Grease, food particles, or other residues on the walls, ceiling, or floor of the microwave can absorb microwave energy and cause sparking. Make sure to clean the interior of the microwave regularly using a mild detergent or microwave-safe cleaning products.
Overcooked or overheated food: If food is overheated or cooked for too long, the water content inside it can evaporate rapidly, causing the remaining moisture to superheat and produce steam. When the food is disturbed or removed from the microwave, this superheated water can erupt, leading to sudden popping or sparking. To avoid this, use microwave-safe containers and follow recommended cooking times.
Damaged magnetron or other components: If the magnetron (the component responsible for generating microwaves) or other crucial microwave components are faulty or damaged, it can lead to irregular microwave emission, resulting in sparking and unusual behavior. In such cases, it is essential to have the microwave inspected and repaired by a qualified technician.
To ensure safety, stop using the microwave immediately if you encounter sparking or popping. If the issue persists after checking for and eliminating potential causes like metallic objects and cleaning the microwave, it's best to have a professional technician examine the appliance for any internal malfunctions or damage. Never attempt to troubleshoot or repair a microwave yourself, as it involves high voltages and can be hazardous without proper training and equipment.