While your dishwasher is running, you will hear the motor and the pump working throughout the cycle. There are normal humming sounds you'll hear during operation. Below are some examples.
The fan that cools the main pump motor is rotating.
The soft food disposer may be grinding up food waste.
The drain pump may be operating.
The following video also provides a short overview of normal operating sounds.
Dishwasher Normal Operating Sounds
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