Sparking inside microwave while heating is a serious issue and should be repaired immediately. There is a wave guide cover over the magnetron, sometimes food particles stick to its surface and get burned.
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What causes sparking inside microwave?
Sparking inside microwave is a common problem. It requires you to immediately switch off the microwave and perform necessary inspection before calling a professional for microwave repair.
Possible reasons behind microwave sparking problem are:
Metal scarp inside microwave: A small metal piece is enough to cause a spark inside microwave. For example you may have cleaned the microwave with steel wool and left behind some metal scrap from the wool. Also sometime the food which you heat has a foil covering over it that catches fire. If the heating dish is not microwave safe, there are fair chances of sparking inside microwave. So make sure that there is no metal scrap and your heating dish is microwave safe before you start cooking food in microwave. In case of microwave sparking problem inspect the microwave for metal scrapes before calling a professional for microwave repair.
Damaged wave guide cover: A very common reason of sparking inside microwave is a damaged wave guide cover. Waveguide covers the magnetron which guides the heat waves to the central area where food is kept. This prevents any food particle or bug from entering the magnetron. It is very common that during cooking, some food particles escape the food and stick to the wave guide. The heat emitted from the magnetron burns these stuck food particles, which appears as spark. The spark damages the wave guide cover of microwave. The solution is to replace the burned wave guide cover with a new one. In case of microwave sparking problem inspect the waveguide cover before calling a microwave repair professional.
Damaged Rack support: Microwave sparking can also be due to faulty rack support. A rack support is a hook like part inside microwave. If the microwave is sparking near one of the support rack, this means that the paint on the rack has worn out.
Diode burn: The high voltage diodes could be shorted or burned causing sparking inside microwave.
If you see spark inside microwave immediately switch off the microwave and perform the necessary inspection before calling a microwave repair professional.