Bosch Washer - Er:18 Error Code

The AquaStop leak protection system has been activated.

Meaning

The AquaStop leak protection system has been activated.

The Bosch Er:18 error code indicates that the AquaStop leak protection system detected water in the base pan. This safety feature prevents flooding by shutting off the inlet valve and stopping the wash cycle. Leaks may come from hoses, the pump, the door boot, or internal seals.

Symptoms

  • Washer stops mid-cycle
  • Water visible under the machine
  • Er:18 displayed immediately after start

Causes

  • Leaking pump
  • Loose internal hoses
  • Door boot tear
  • Over-sudsing overflow
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Step-by-Step Fixes

  • Unplug the washer and inspect the base pan.
  • Dry the base pan completely.
  • Check hoses and pump for leaks.
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Safety Notes

  • Do not bypass AquaStop sensors.
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Applicable Models

Show Models
  • WFL2060
  • WFR2460
  • WFMC3301
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Related Pages

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Other Bosch Washer Error Codes

Show All Error Codes

Model-Specific Notes

On WFR models, Er:18 often appears after heavy over-sudsing events.

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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