Thermador Dishwasher Error E18

⚡ Quick Answer: The Thermador Dishwasher E18 error indicates a drainage issue, typically caused by insufficient water flow into the appliance. This error may prevent ... ✅ DIY Fixable

What Does Error E18 Mean?

The Thermador Dishwasher E18 error indicates a drainage issue, typically caused by insufficient water flow into the appliance. This error may prevent the dishwasher from completing its wash cycle and can be accompanied by unusual sounds from the pump. Common symptoms include the display showing E18, the dishwasher stopping prematurely, or indications of low water fill. Ensuring the water supply and inlet hose are clear is essential for resolution.

Common Symptoms:

  • Display shows E18
  • Dishwasher stops early or won’t start wash cycle
  • Dishwasher indicates insufficient water fill

Possible Causes

  • Insufficient water flow into the dishwasher (high)
  • Kinked/damaged inlet hose or low water pressure (medium)

How to Fix Error E18

DIY Fix Check water supply and inlet hose

  1. Turn off dishwasher and power.
  2. Ensure the water supply valve feeding the dishwasher is fully open.
  3. Inspect the inlet water hose for kinks, bends, or damage.
  4. Straighten hose or replace if damaged.
  5. Restart dishwasher to see if error clears.

Technician Only Test water flow and inlet assembly

  1. Measure water flow rate to ensure it meets at least ~10 L/min.
  2. Inspect and clean any inlet valve filter screens.
  3. Check the inlet valve operation and replace if faulty.
  4. Verify water pump functionality and replace if defective.

Parts needed: Inlet water hose, Inlet valve, Flow sensor, Pump assembly

🛑 When to Call a Pro:
  • If water supply is adequate and hoses are clear but E18 persists
  • If water inlet valve or internal components need replacing and user lacks technical skill

Technical Specifications

wattage 60W
component Drain Pump
resistance 10-15 ohms
part_number 00711680
voltage_rating 120V AC

Common Questions

What does E18 error mean on Thermador Dishwasher?

E18 indicates a drainage issue caused by insufficient water flow, preventing the wash cycle from completing.

Can I fix Thermador Dishwasher E18 error myself?

Yes, check the water supply, ensure the inlet hose is free of kinks, and verify the water valve is open.

How much does it cost to fix E18 error?

Repair costs for the E18 error typically range from $50 to $300 depending on the required parts.

When should I call a technician for E18?

Call a technician if the water supply is adequate and hoses are clear but the E18 error persists.

Sources & References

Data last verified: 2026-03-25

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