Bertazzoni
Lower Spray Arm / Sump Blockage
Dishwasher bottom rack dishes remain dirty while upper rack is clean.
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Possible Causes
Clogged lower spray arm, Debris blocking lower spray arm hub, Diverter valve stuck in upper-only position (if equipped), Weak circulation pump
How to Fix / Troubleshooting
Safety first: Disconnect power before removing spray arms.
- 1. Clean lower spray arm: Remove and flush the lower spray arm, clearing all jets.
- 2. Check hub and bearing: Ensure the lower arm hub is free of debris and allows free rotation.
- 3. Diverter valve: If your model has zone wash, inspect the diverter valve for sticking and clean or replace as needed.
Persistent lower rack issues may indicate a circulation pump problem.
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Repair Difficulty
Easy
2/5
Required Part
Lower Spray Arm
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