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Conducting periodic inspections for electrical malfunctions:
When conducting periodic inspections of your microwave unit, be sure to also thoroughly inspect the cord and the plug. Make sure there is no physical damage to the cord itself, and that the plug fits the outlet securely and tightly. Keep in mind that the cord and plug can be damaged by the heat produced by your microwave and by the heat produced by other appliances in close proximity. Should you discover any signs of overheating at the plug outlet, then the outlet and/or the plug itself should be replaced. Contact an appliance repair technician.
Also, check for built up dust and dirt in and around the ventilation holes and grills. If necessary, use a vacuum cleaner to collect dust and dirt. Periodically cleaning out the ventilation holes will greatly reduce the risk of overheating.
CAUTION: Your microwave oven is capable of giving you a serious electrical shock, even when it is unplugged. We strongly suggest you seek the assistance of an appliance repair technician when conducting any microwave oven repair.