I am having the same problem with an LG over the range microwave. The vent will just turn on by itself when its not being used. The only way to turn it off is to unplug it. None of the controls wotk and opening and shutting the door doesnt help.We are not cooking when this happens and have even woken up in the morning to find it running. ve had repairmen out and all have different ideas but not one pat answer.
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