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1. Refrigerator makes humming noise.
1. If refrigerator temperature is not cool enough, motor and fan motor run at high speed to cool causing a high noise.
2. Noise level may differ by house structure, location of the refrigerator, floor material, and floor level.
How to fix
1. Speed is controlled depending on inside temperature causing irregular noise. It is not a defective sign, and the product is normal.
[Inner fan in the refrigerator]