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Hi JohnEB, To keep the WMH53521HZ from overheating, the auto vent fan will automatically turn on at high speed if the temperature from the range or cooktop below the microwave oven gets too hot. When this occurs, the vent fan cannot be turned off. “AUTO FAN ON for heat circulation” appears in the display.
Sorry, there was a problem. Please try again later.This is a deal breaker for me . It could run for and hour on high and you can't turn it off ? NO DEAL
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