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
- Turn off dishwasher and power.
- Ensure the water supply valve feeding the dishwasher is fully open.
- Inspect the inlet water hose for kinks, bends, or damage.
- Straighten hose or replace if damaged.
- Restart dishwasher to see if error clears.
Technician Only Test water flow and inlet assembly
- Measure water flow rate to ensure it meets at least ~10 L/min.
- Inspect and clean any inlet valve filter screens.
- Check the inlet valve operation and replace if faulty.
- Verify water pump functionality and replace if defective.
Parts needed: Inlet water hose, Inlet valve, Flow sensor, Pump assembly
- 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
Next step
Choose the next step for E18
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
Drain Pump
Pumps waste water out of the appliance during the drain cycle.
- Typical part-only price
- $35 - $80
- DIY difficulty
- Easy
- Estimated time
- 15-30 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 Hose
Carries waste water from the drain pump to your home's standpipe or sink drain.
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.
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
- Thermador Dishwasher Error Code E18 Official Support (official)
- Thermador Dishwasher Error Codes Listing (official)
Data last verified: 2026-07-22
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