Thermador Dishwasher: leaking

Professional Repair Guide

What is this symptom?

Is your Thermador dishwasher leaking water during operation? Common signs include water pooling around the base, leaks through the door, or water visible under the appliance. Identifying the cause is essential for effective repairs.

Urgency: Medium

Important Tips for Thermador Models

  • Leaks around the door and base often relate to door gasket degradation and internal hose connections specific to Thermador design.

Possible Causes

Worn or damaged door gasket

How to Identify: Water pooling at the front edge or through the door during wash cycles; visual signs of cracks, hardness, or deformation in the rubber seal.

Part: Door gasket / seal

Faulty or stuck water inlet valve

How to Identify: Leak occurring even when the dishwasher is off or a continuous fill condition; water entering and overfilling the tub.

Part: Water inlet valve

Cracked or misaligned spray arm

How to Identify: Leaks appearing mid-cycle with water splashing in abnormal directions; visible cracks in the spray arm upon inspection.

Part: Spray arm / wash arm assembly

Pump seal or motor shaft seal failure

How to Identify: Leak underneath the dishwasher near the motor area during wash or drain; water trails corresponding with pump operation.

Part: Pump seal / motor shaft seal

Leveling or installation issue

How to Identify: Dishwasher visibly tilting forward or not level, water puddles at front corners but seals and hoses appear intact.

Part: Leveling legs / installation alignment

DIY Solutions

Inspect and Replace Door Gasket

Moderate 20-40 minutes
Tools Needed: screwdriver, replacement gasket
  1. Turn off power and water to dishwasher.
  2. Open the dishwasher and visually inspect the entire perimeter gasket for cracks or hard spots.
  3. Remove the old gasket by gently pulling it out of its channel.
  4. Install a new Thermador-compatible gasket by pressing it into the channel all around.
  5. Close and run a short cycle to check for leaks.
⚠️ Safety First: Ensure power is off before working near electrical components.

Clear and Inspect Hoses and Clamp Connections

Moderate 30-60 minutes
Tools Needed: screwdriver, bucket, flashlight
  1. Turn off power and water supply.
  2. Pull out dishwasher slightly to access rear connections.
  3. Inspect drain and supply hoses for kinks, cracks, or loose clamps.
  4. Tighten hose clamps and replace damaged hoses if necessary.
  5. Reconnect and test with a short rinse cycle.
⚠️ Safety First: Be cautious of sharp sheet edges behind the unit.

Professional Repairs

Replace Water Inlet Valve

Estimated Cost: $50 - $150

Pump Seal / Motor Shaft Seal Replacement

Estimated Cost: $80 - $250

When to Call a Professional

Water continues to leak after replacing door gasket and checking hoses.
Leak originates from beneath the dishwasher near the pump or motor area.
Internal component (inlet valve, pump) failure suspected.

Preventive Maintenance

  • Clean and inspect door gasket: Gasket deterioration and front-leaks
    Frequency: monthly
  • Check hoses and clamps: Leaks from hose failure or loose connections
    Frequency: annually

Frequently Asked Questions

Why is my Thermador Dishwasher leaking?
Common causes include a worn door gasket, faulty water inlet valve, or misaligned spray arm.
How do I fix Thermador Dishwasher leaking myself?
Inspect and replace the door gasket or check hoses for kinks and cracks.
How much does it cost to fix leaking?
Professional repairs range from $50 to $250 depending on the issue.
When should I call a technician for leaking?
If DIY fixes fail or if leaks persist, it's best to consult a professional.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

50%
DIY Success Rate Difficulty: DIY

Common Issues Reported by Users

  • Worn or damaged door seals (2 mentions)

User Suggested Solutions

  1. Replaced sump gasket with part 12005744

    Success rate: 50.0%

  2. Replace lower door seal assembly and gasket

    Success rate: 0.0%
Analysis based on 2 community discussions
View Sources

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

  1. Thermador Dishwasher Sump Gasket
  2. Thermador dishwasher leaking after replacing seals

Community Discussions

slow leak causing E15 error

Replaced sump gasket with part 12005744, which includes gasket and installation instructions.

DIY View on Reddit →

Source: Reddit r/appliancerepair

User Comments (0)

Share your experience or solution below.

Be the first to comment!