KitchenAid Cross-Flow Between Dishwasher and Disposal

Garbage disposal runs but occasionally spits water and debris out when the dishwasher drains.

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Possible Causes

Improper air gap or high loop, Partially blocked disposal outlet, Incorrect baffle tee orientation

How to Fix / Troubleshooting

Safety First: Turn OFF power to the disposal and dishwasher.

Step-by-step:

  • 1. Verify air gap/high loop: Ensure the dishwasher drain hose is routed with a high loop or through an air gap to prevent backflow.
  • 2. Clean disposal outlet: Remove and clean the discharge elbow and check for restrictions.
  • 3. Inspect baffle tee: Confirm the under-sink baffle tee is oriented to direct flow downward, not toward the disposal opening.
  • 4. Secure splash guard: Make sure the KitchenAid splash guard fits snugly to reduce upward spray.
  • 5. Test: Run a dishwasher drain cycle and observe the sink opening.

When to call a technician: Persistent cross-flow may require reconfiguring the under-sink plumbing.

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Repair Difficulty

Easy 2/5

Required Part

Dishwasher Drain Hose
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