Our over the range microwave blows all the air out the top of the microwave back into the house instead of exhausting it to the outside via the duct connected to the top of the unit hidden in the top cupboard above the microwave. I took the duct off of the top and checked the damper and its fine and the duct is connected to the outside.
The exhaust motor was not installed properly - it has to be turned 90 degrees so that the blower openings face up instead of the front. Whoever installed it didn't read the directions:)
Unfortunately, the unit will have to be taken down from the wall to correct the motor.
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