Bosch Dishwasher: making loud noise

Professional Repair Guide

What is this symptom?

Is your Bosch dishwasher making loud noises like grinding, buzzing, or knocking during operation? This can indicate issues such as debris in the pump, improper loading, or worn bearings. Addressing these problems promptly can help restore your dishwasher's quiet efficiency.

Urgency: Medium

Important Tips for Bosch Models

  • Bosch official support highlights debris in pump and improper loading as common noise causes.
  • Bosch documentation advises proper utensil placement to avoid noise from spray arms.

Possible Causes

Foreign objects or debris in pump or impellers

How to Identify: Grinding or harsh noise during wash or drain; inspect lower filter and pump area for glass, hard food particles, utensils blocking impellers.

Part: Drain pump impeller / Wash impeller

Improper loading causing spray arm contact

How to Identify: Knocking or rattling noise during wash cycle; spray arms hitting dishes because of poor loading.

Part: Spray arms

Worn or failing circulation pump motor bearings

How to Identify: Loud humming/whining or grinding during wash or circulation; persistent noise that continues after debris cleared.

Part: Circulation pump motor

Light or uneven load causing loud water impact

How to Identify: Loud swishing or banging when load is small or uneven; water jets striking tank directly.

Part: Operational load distribution

DIY Solutions

Check and Remove Debris from Pump Area

Moderate 15–30 minutes
Tools Needed: Flashlight, Work gloves
  1. Turn off power and water supply.
  2. Remove lower rack and dishwasher filter assembly.
  3. Remove pump cover and inspect for debris blocking pump impellers.
  4. Use gloves to remove visible objects and reassemble filter and rack.
  5. Run short empty cycle to check noise reduction.
⚠️ Safety First: Disconnect power at breaker before accessing pump area.

Rearrange Dishes to Avoid Spray Arm Contact

Easy 5–10 minutes
  1. Pause the dishwasher and open door.
  2. Ensure spray arms can spin freely without hitting dishes.
  3. Place large items in bottom rack, smaller items on top with even distribution.
  4. Avoid overloading or placing tall items that block spray arms.
  5. Restart and observe noise reduction.

Fill Dishwasher to Moderate Load to Reduce Impact Noise

Easy 2–5 minutes
  1. Ensure dishwasher has a reasonably full load; avoid very light loads.
  2. Distribute dishes evenly across racks.
  3. Avoid clusters of lightweight items that can shift.
  4. Run cycle and note quieter operation.

Professional Repairs

Replace Drain Pump or Impeller

Estimated Cost: $80–$250

Replace Circulation Pump Motor

Estimated Cost: $150–$400

Inspect and Replace Spray Arms or Bearing Rings

Estimated Cost: $30–$100

When to Call a Professional

Noise persists after clearing debris and proper loading
Drain or wash pumps making grinding or loud buzzing noises
Circulation pump suspected damaged or failed bearings
Dishwasher not draining properly alongside noise

Preventive Maintenance

  • Clean filters and pump area: Debris buildup causing pump noise
    Frequency: Monthly
  • Load dishes properly: Spray arm obstruction and rattling noise
    Frequency: Every wash
  • Inspect spray arms for clogs: Uneven water flow noise
    Frequency: Quarterly

Frequently Asked Questions

Why is my Bosch Dishwasher making loud noise?
Common causes include foreign objects in the pump, improper loading, or worn circulation pump motor bearings.
How do I fix Bosch Dishwasher making loud noise myself?
Check for debris in the pump area, rearrange dishes to avoid spray arm contact, and ensure a moderate load.
How much does it cost to fix making loud noise?
Professional repairs can range from $30 to $400 depending on the issue, like replacing the pump or motor.
When should I call a technician for making loud noise?
If DIY solutions don't resolve the issue or if you suspect serious mechanical failure, call a technician.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

65%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Worn or damaged motor bearings
  • Loose or damaged spray arm
  • Debris or foreign objects in the pump or filter

User Suggested Solutions

  1. Inspect and replace motor bearings if worn or damaged. Disconnect power, remove the dishwasher from the cabinet, and access the motor to check the bearings. Replace if necessary.

  2. Check the spray arm for looseness or damage. Ensure it is securely attached and free of blockages. If damaged, replace the spray arm.

  3. Clean the pump and filter to remove any debris or foreign objects. Access the filter and pump area, remove any blockages, and reassemble.

Analysis based on 1 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Bosch Dishwasher making loud noise?

Community Discussions

making loud noise

Noise stopped after running a cycle, likely due to stiffness from lack of use.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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