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Is there a water purifier installed in the kitchen? If it is installed, it may be the noise generated by the water purifier in water treatment.
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Because there is no trip, it means that the wiring and equipment are normal, and it should be sent by some of your electrical appliances such as refrigerators.
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Our kitchen is the same as yours, unplug all the power plugs or tick non-stop, pull the kitchen gate and it doesn't ring, may I ask, have you found out the reason?
Toilets have ventilated areas, and when the wind blows in from outside, an air flow circuit is formed, and a buzzing sound occurs, like a whistle. Find out where the sound is coming from, seal it and eliminate it. Hope to adopt.
If you can rotate, the capacitor is burned, and if you can't rotate flexibly, then clean it up and add some sewing oil, and turn it a few times with your hand until you can turn it flexibly.
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During the day, I guess it's sunburned. It's hard to say at night.