I regularly clean my dishwasher. I remove the sprayers and clean them out. I have run a cycle with drano and then a cycle with an empty dishwasher. It makes a loud humming/roaring noise in the cleaning cycle. Normal sounding when it's filling with water and draining. The top rack doesn't clean well and leaves a greasy white film on my dishes.
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Cause 1
Drain Pump
First, check the drain pump to ensure that it is clear of debris. If the drain pump is clean but it is still noisy, replace it.
Cause 2
Circulation Pump
The circulation pump motor has bearings that wear out over time. When the motor bearings fail, they generate a continuous drone. If the motor bearings have failed, you must replace the entire circulation pump.
Cause 3
Drain Impeller
The drain impeller pushes water through the drain hose and into the garbage disposer or drain line. If the impeller is broken, replace it.
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