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Please make sure the reverse switch is fully engaged to one side or the other. If it is not engaged this can emit a humming noise as it is not making a good electrical contact. Finally, make sure the switch on the wall controlling the power to the fan is not a dimmer switch, it needs to be a single pole switch. If the humming is still present then we sill need to get the fan without the blades or down-rod back to us for review and warranty. You will need to ship it to us at the following address and we repair or replace if needed. Address: Troposair C/O Dan's Fan City 300 Dunbar Avenue Oldsmar, FL 34677 Phone 1-855-326-7352 Thank you, Michael Troposair