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crwdns2893792:0crwdne2893792:0 john.lorne.andrews ,

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There is a safety switch (thermostat) that is often located just behind the user interface. If there is an issue with the thermostat or connection it can cause a hum in the motor of the fan motor. Give the safety switches a test for continuity.   This was the issue with a humming Samsung microwave I just repaired.

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open