Miele Dishwasher: loud noise

Professional Repair Guide

What is this symptom?

Experiencing loud noises from your Miele dishwasher? Grinding, humming, or rattling sounds could indicate underlying mechanical issues. These noises, louder than normal, may stem from obstructed spray arms, debris in the filter, or wear in the circulation pump. It's crucial to identify and resolve these issues promptly to maintain your dishwasher's performance and longevity.

Urgency: Medium

Important Tips for Miele Models

  • Miele dishwashers are specifically engineered for quiet operation; unusual loud noise often indicates mechanical component wear or obstruction.

Possible Causes

Obstructed or damaged spray arms

How to Identify: Rattling or knocking noise during spray arm rotation; arm does not spin freely or bumped by dishware

Part: Spray arms

Foreign objects or debris in filter/pump area

How to Identify: Grinding or unusual noise during wash; visible debris under lower spray arm or in filter area

Part: Filter and pump housing

Circulation pump or motor wear

How to Identify: Persistent loud humming or growling through cycle, reduced water pressure; noise remains after cleaning debris

Part: Circulation pump and motor

Drain pump issues

How to Identify: Buzzing or grinding sound specifically during drain cycle, slow drainage or water left after cycle

Part: Drain pump

Loose internal components or racks

How to Identify: Rattling noise correlating with water pressure changes, items shifting during cycle

Part: Internal racks and mounts

Poor leveling or mounting

How to Identify: Vibration noise that changes with cycle or load; visible uneven stance

Part: Dishwasher frame/mounting

Water inlet valve noise

How to Identify: Loud humming or buzzing at start of fill cycle, slow fill

Part: Water inlet valve

DIY Solutions

Inspect and clean spray arms

Moderate 15–30 minutes
Tools Needed: screwdriver, soft brush
  1. Turn off and disconnect power.
  2. Remove lower and upper spray arms.
  3. Clean spray arm holes and remove debris; ensure they rotate freely.
  4. Reinstall spray arms and run a short cycle to check noise.
⚠️ Safety First: Disconnect power before working inside dishwasher

Clean filter and pump area

Moderate 15–20 minutes
Tools Needed: gloves, towel, soft brush
  1. Turn off power.
  2. Remove bottom rack and access the filter assembly.
  3. Remove debris and food particles from filter and sump area.
  4. Reassemble and test dishwasher.
⚠️ Safety First: Avoid reaching blindly to prevent injury from sharp debris

Level dishwasher and secure mounts

Easy 10–15 minutes
Tools Needed: level, wrench
  1. Check dishwasher level front-to-back and side-to-side.
  2. Adjust leveling legs as needed.
  3. Ensure mounting brackets are tight.
  4. Run dishwasher to see if noise improves.

Professional Repairs

Replace circulation pump or motor assembly

Estimated Cost: $200–$500

Replace drain pump

Estimated Cost: $150–$350

Inspect and fix internal loose components

Estimated Cost: $100–$250

When to Call a Professional

Noise persists after DIY debris cleaning and leveling
Loud grinding or humming indicating possible pump/motor wear
Drain issues with water remaining after cycles

Preventive Maintenance

  • Clean filters: Debris buildup causing noise
    Frequency: monthly
  • Check spray arms: Obstructions and knock noises
    Frequency: monthly
  • Check leveling: Vibration noise
    Frequency: quarterly

Frequently Asked Questions

Why is my Miele Dishwasher loud noise?
Common causes include obstructed spray arms, debris in the filter, and worn circulation pumps.
How do I fix Miele Dishwasher loud noise myself?
Inspect and clean the spray arms and filter; level the dishwasher for better operation.
How much does it cost to fix loud noise?
Professional repairs range from $100 to $500 depending on the issue.
When should I call a technician for loud noise?
If DIY solutions don't resolve the issue or if the noise persists, contact a professional.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

75%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Worn or damaged pump bearings
  • Loose or damaged spray arm
  • Foreign objects in the impeller or drain area

User Suggested Solutions

  1. Inspect and replace worn pump bearings. First, disconnect the dishwasher from power and water. Remove the lower spray arm and cover to access the pump. Check for wear and replace if necessary. Reassemble and test.

  2. Tighten or replace the spray arm. Remove the spray arm and check for any damage or looseness. If damaged, replace it with a new one. Reattach and ensure it spins freely.

  3. Clear foreign objects from the impeller or drain area. Remove the lower spray arm and check for any debris or objects that may be obstructing the impeller. Clean thoroughly and reassemble.

Analysis based on 1 community discussions
View Sources

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

  1. Very loud dishwasher Miele G5420 SCI

Community Discussions

very loud continuous noise during operation

The issue is likely due to rust in the pump bearing.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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