“Just bought this model yesterday to replace an ancient microwave... disappointed to notice that the Insignia makes a high pitched hum when door is open. Might be lightbulb. Is this normal or a defect? So heavy to take back! :(”

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• I haven't heard anything, it sounds like you might have a factory defect. Mine is really quiet when running. No noise at all with just the door open.

  Answered by Rose 7 years ago

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• Must be a defect, mine is extremely quiet with no “hum” on opening door.

  Answered by Hunta 7 years ago

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• I think it's a defect because mine doesn't has that sound.

  Answered by DRBILL 5 years ago

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