Bosch Washer - E18 Error Code

The washer is draining too slowly or not at all.

Meaning

The washer is draining too slowly or not at all.

The Bosch E18 and F18 error codes indicate that the washer has detected a drainage problem. Bosch washers monitor how quickly water leaves the drum; if the drain time exceeds the expected threshold, the machine displays E18 to prevent cycle failure and pump overheating. This is typically caused by a clogged drain filter, blocked hose, or pump obstruction.

Symptoms

  • Water left in the drum
  • Washer stops mid-cycle with E18
  • Loud humming from the pump
  • Slow or incomplete draining

Causes

  • Clogged drain filter
  • Blocked drain hose
  • Foreign objects in the pump
  • Weak or failing pump motor
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Step-by-Step Fixes

  • Clean the drain filter thoroughly.
  • Check the drain hose for clogs or kinks.
  • Inspect the pump impeller for debris.
  • Run a drain-only cycle to confirm flow.
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Safety Notes

  • Expect water to spill when opening the filter—use a tray.
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Applicable Models

Show Models
  • WAT28400UC
  • WAT28401UC
  • WGB86200UC
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Related Pages

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Other Bosch Washer Error Codes

Show All Error Codes

Model-Specific Notes

On the 800 Series platform, E18 may appear after extended drain retries if partial blockages are present.

Disclaimer

The information provided on this page is for educational and informational purposes only. Repairs involve electrical, mechanical, and water-related risks. Always follow manufacturer instructions and consider contacting a qualified technician for diagnosis or repair.

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