Thermador Dishwasher: loud noise during cleaning cycle
What is this symptom?
Experiencing a loud noise during the cleaning cycle of your Thermador dishwasher? This unusual sound, which can include grinding, humming, buzzing, or rattling, indicates potential issues with components like the circulation pump or spray arms. Identifying the source of the noise is crucial for effective troubleshooting and repairs.
Important Tips for Thermador Models
- Thermador manuals note that some noise is normal but persistent loud noise during wash cycle suggests circulation pump or component wear.
Possible Causes
Worn or failing circulation pump / pump motor bearings
How to Identify: Continuous loud humming or grinding noise during wash cycle; noise correlates with water circulation and spray arm operation.
Part: Circulation pump / motor
Damaged or broken wash impeller
How to Identify: Grinding or scraping sounds; reduced water pressure at spray arms; visible debris damage on impeller when inspected.
Part: Wash impeller inside pump
Obstructions (debris) in drain pump or spray arms
How to Identify: Noise can vary (grinding/buzzing; inspect for lodged food, glass shards, cutlery in filter area, drain pump, spray arm mounts.
Part: Drain pump / spray arms
Loose or damaged spray arm or component
How to Identify: Rattling or clanking sounds; inspect spray arms for cracks, obstruction or misalignment hitting dishes.
Part: Lower/upper wash arms or mounting parts
DIY Solutions
Clean filter and inspect for debris
- Turn off power and open dishwasher
- Remove lower dish rack and locate filter assembly
- Take out filter and clean off food debris; check underside for foreign objects
- Reassemble and run a short cycle to test noise
Inspect and clear spray arms
- Turn off power and remove lower and upper racks
- Remove spray arms (twist/pull per model)
- Check nozzles for clogs and clean with brush
- Ensure arms spin freely and reinstall
- Run cycle to check noise
Next step
Choose the next step for loud noise during cleaning cycle
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Dishwasher Circulation Pump
Circulates pressurized water through the dishwasher spray arms during the wash cycle.
- Typical part-only price
- $90 - $220
- DIY difficulty
- Hard
- Estimated time
- 60-120 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Drain Pump
Pumps waste water out of the appliance during the drain cycle.
Spray Arm
Rotates and sprays high-pressure water to clean dishes inside the tub.
Model-compatible Dishwasher parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Dishwasher Cleaner and Descaler
Supports routine removal of mineral scale, grease, and odor. It is maintenance, not a repair for a failed pump, valve, or control.
Braided Dishwasher Inlet Hose
For replacement of an externally damaged supply hose. Verify connection size, length, and appliance installation requirements before ordering.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Professional Repairs
Replace circulation pump / motor assembly
Replace wash impeller or pump components
Replace water inlet valve
When to Call a Professional
Preventive Maintenance
-
Clean filter and spray arms: Debris buildup that can cause noise and poor performance
Frequency: monthly -
Inspect lower pump area: Obstructions causing grinding or humming noises
Frequency: annually
Frequently Asked Questions
Why is my Thermador Dishwasher loud noise during cleaning cycle?
How do I fix Thermador Dishwasher loud noise during cleaning cycle myself?
How much does it cost to fix loud noise during cleaning cycle?
When should I call a technician for loud noise during cleaning cycle?
Community Analytical Insights
Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions
Common Issues Reported by Users
- Loose or damaged spray arm
- Debris in the filter or impeller
- Worn out or faulty motor
User Suggested Solutions
-
Inspect and secure the spray arm. Remove the spray arm and check for any damage or looseness. Tighten or replace as necessary.
-
Clean the filter and impeller. Remove the bottom rack, take out the filter, and clean it under running water. Check the impeller for debris and clean it as well.
-
Check and test the motor. If the motor is making unusual noises, it may need to be replaced. Consult the user manual for specific motor testing procedures.
Limited-source guidance; percentages and success-rate claims are not shown
View
Sources
Data compiled from real discussions on r/appliancerepair and r/Appliances:
Community Discussions
makes loud noise when top shelf is loaded
Loading adjustments to reduce noise
Source: Reddit r/appliancerepair
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