KitchenAid · Microwave Ovens
The microwave oven's auto hood fan will automatically activate at high speed if the temperature from the range or cooktop below gets too hot. During this time, the fan cannot be manually turned off by the user.
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Understand that this is a normal safety feature to prevent overheating.
Allow the fan to run until the temperature below the microwave oven decreases.
The fan will turn off automatically once the temperature returns to a safe level.