KitchenAid Dishwashers Making Unusual Noise: How to Fix It Yourself
Grinding, humming, or rattling noises in a KitchenAid dishwasher are usually caused by something caught in the chopper blade area, a loose spray arm, or dishes vibrating against each other. A quick check inside usually reveals the cause.
⚠️ Safety First
- Turn off the dishwasher and disconnect power before inspecting internals.
- Be careful around the chopper blade — it has sharp edges.
Parts You May Need
Step-by-Step Repair
- 1
Identify when the noise happens
Listen during different phases. Noise during fill = water inlet valve. Noise during wash = spray arm, pump, or foreign object. Noise during drain = drain pump issue. Rattling throughout = dishes bumping or a loose rack.
- 2
Check for foreign objects
Remove the bottom rack and inspect the tub floor. Look for broken glass, bones, fruit pits, or other debris around the drain area and under the spray arm. Remove anything that does not belong.
- 3
Inspect the spray arms
Spin each spray arm by hand. They should rotate freely without wobbling or clicking. If a spray arm is loose, tighten the retaining nut or replace the bearing ring. A cracked spray arm will also flap and make noise.
- 4
Check the chopper blade area
Remove the lower spray arm and the filter assembly. Under the filter you will find the chopper blade that grinds food particles. Check for cracked blades or debris stuck around them. Clean the area and replace the blade if damaged.
- 5
Rearrange the dishes
Ensure nothing is sticking out of the racks and hitting the spray arms. Make sure tall items on the bottom rack are not blocking the spray arm rotation. Load glasses securely so they do not rattle. Run a test cycle.
If That Didn't Work
- Worn wash pump motor bearings
- Failing drain pump
- Water hammer from household plumbing
When to Call a Professional
If the noise is a loud buzzing or grinding from the pump area and cleaning did not help, the wash pump motor may be failing. Pump replacement runs $150–$250 with labor.
Related Repairs
Disclaimer: This guide is for informational and educational purposes only and does not constitute professional repair advice. All repairs are performed at your own risk. RepairItFree.com is not liable for any personal injury, property damage, device damage, voided warranties, or other losses resulting from the use of this information.
If you are unsure about any step — especially anything involving electricity, gas, water, or refrigerant — stop and consult a qualified professional. Your safety is more important than saving money.
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