Bosch Dishwasher: making loud noises

Professional Repair Guide

What is this symptom?

Is your Bosch dishwasher making loud, unusual noises during wash or drain cycles? If you hear grinding, rattling, or excessive vibration, it could indicate improper loading, clogged spray arms, or issues with the drain pump. Addressing these noises promptly can help maintain your appliance's efficiency and prolong its lifespan.

Urgency: Medium

Important Tips for Bosch Models

  • Bosch notes that some noise is normal and louder operation doesn’t always indicate a fault; check manufacturer’s spec for expected noise levels.

Possible Causes

Improper loading or loose items contacting spray arms

How to Identify: Noise correlates with water jets; unusual banging or clattering; items move or hit interior during operation.

Part: Dishware/Utensils & Spray Arms

Clogged or dirty spray arms or filters causing noisy water flow

How to Identify: Noise occurs with water circulation; water jets may be weak; visible debris on spray arms or filters.

Part: Spray Arms, Filters

Worn or loose drain pump/impeller

How to Identify: Grinding or loud noises during drain cycle rather than wash; possible debris caught in impeller area.

Part: Drain Pump / Impeller

Installation or vibration amplification

How to Identify: Noise more noticeable when unit vibrates against cabinets or unstable base; unit not level.

Part: Mounting / Cabinet

Normal operational sounds at higher dB levels

How to Identify: Sound is consistent with described normal operation, no functional issues; not louder than usual for model spec.

Part: General Mechanism

DIY Solutions

Rearrange dishes and check for loose items

Easy 5-10 minutes
  1. Open dishwasher and remove items that could contact spray arms.
  2. Reposition dishes and utensils to avoid contact with rotating spray arms.
  3. Ensure items like bottles are secured or laid flat so they won’t move.

Clean spray arms and filters

Moderate 15-30 minutes
Tools Needed: Screwdriver (if required), Warm water, Soft brush
  1. Turn off and unplug dishwasher for safety.
  2. Remove and inspect spray arms for debris; rinse under water.
  3. Remove and clean filters at bottom of dishwasher; clear visible debris.
  4. Reassemble parts and test operation.
⚠️ Safety First: Ensure unit is powered off before removing parts.

Level dishwasher and check installation stability

Moderate 10-20 minutes
Tools Needed: Level, Adjustable wrench
  1. Use a level to check if dishwasher is even.
  2. Adjust feet or mounting brackets so unit sits level.
  3. Ensure the dishwasher is securely anchored to cabinets and base.

Professional Repairs

Replace worn or faulty drain pump or impeller

Estimated Cost: $100 - $300

Service or replace motor/circulation pump

Estimated Cost: $200 - $500

When to Call a Professional

Persistent grinding or unusual noises after DIY checks
Whining noise indicating motor or pump failure
Leaks accompanying noise or unusual smells

Preventive Maintenance

  • Regularly clean spray arms and filters: Noise due to debris blockage
    Frequency: Monthly
  • Check leveling and mounting annually: Vibration-related noise
    Frequency: Annually

Frequently Asked Questions

Why is my Bosch Dishwasher making loud noises?
Common causes include improper loading, clogged spray arms, or a worn drain pump.
How do I fix Bosch Dishwasher making loud noises myself?
Rearrange dishes, clean spray arms and filters, and level the dishwasher to prevent contact and noise.
How much does it cost to fix making loud noises?
Professional repairs for noisy issues can range from $100 to $500 depending on the problem.
When should I call a technician for making loud noises?
If DIY fixes don't resolve the issue or if the noises persist, it's time to consult a professional.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

70%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Obstruction in the spray arm or filter
  • Worn or damaged circulation motor
  • Loose or damaged components (e.g., door latch, tub, or mounts)

User Suggested Solutions

  1. Inspect and clean the spray arm and filter. Remove any debris or obstructions that may cause noise during operation. Check the spray arm for proper rotation.

  2. Test the circulation motor by listening for unusual sounds. If the motor is noisy or not functioning, consider replacing it. Disconnect power, remove the motor, and install a new one following the manufacturer's instructions.

  3. Check for loose or damaged components. Tighten or replace any loose parts, especially around the door latch and tub mounts. Ensure that all screws and fasteners are secure.

Analysis based on 1 community discussions
View Sources

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

  1. Bosch dishwasher making loud noises

Community Discussions

making loud noises

Possible issue with the circulation motor, either due to an obstruction or motor failure.

Pro needed View on Reddit →

Source: Reddit r/appliancerepair

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