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1) If you temporarily relocate the appliances to other wall receptacles in the home, does the humming noise follow or go away?
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If you are still in need of assistance on the situation.
1. The receptacles being used on these kettles are on their own circuits at the panel?
2. Are the receptacles GFCI protected?
3. Can you do a temporary test at the washing machine receptacle perhaps for the same noise?
Let me know and we can continue,