If you notice sparking or arcing inside a microwave oven, it is important to address the issue promptly, as it can be hazardous. Several possible causes can lead to sparking or arcing inside a microwave oven:
Metallic objects: Metallic materials, such as aluminum foil, metal utensils, or aluminum containers, should not be placed inside a microwave oven. When these objects come into contact with the microwave's interior walls or the oven's metal rack, they can cause sparks or arcing.
Damaged waveguide cover: A microwave oven has a waveguide cover that protects the opening where microwaves enter the cooking area. If the waveguide cover is damaged, it can cause sparks. Damages can occur due to food splatters, overheating, or general wear and tear.
Food debris or moisture: Food particles or liquid spills inside the microwave can create a conductive path for electricity, resulting in sparking or arcing. It is essential to keep the microwave clean and promptly wipe away any spills or food debris.
Deteriorated or dirty interior surfaces: Over time, the interior surfaces of a microwave oven can deteriorate or become dirty. If the oven's paint or coating has worn off or if there is excessive dirt or grime, it can lead to arcing. Regular cleaning and maintenance of the interior are necessary to prevent this issue.
Malfunctioning components: In some cases, faulty or malfunctioning components within the microwave oven can cause sparking or arcing. This could include issues with the magnetron (the component that produces microwaves), the high voltage diode, or the capacitor. If you suspect a component malfunction, it is best to seek professional repair or consult the manufacturer.
If you experience sparking or arcing in your microwave oven, it is recommended to turn off and unplug the appliance immediately. Continuing to use a microwave with such issues can pose a fire hazard. It is advisable to have the appliance inspected and repaired by a qualified technician or contact the manufacturer for further guidance.