What are the symptoms of error code E23?

Washer stops mid-cycle with E23 or F23, Visible water under or around the machine, Washer refuses to start a new cycle, Repeated filling and draining attempts

What causes error code E23?

Leaking drain pump or pump seal, Loose or cracked internal hoses, Over-sudsing causing foam overflow, Door boot tear allowing water to escape, Residual water from a previous spill or transport

How do I fix error code E23?

Unplug the washer and inspect the base pan for water., Dry the base pan completely and restart the washer., Check internal hoses and clamps for leaks., Inspect the drain pump housing for cracks., Reduce detergent usage if over-sudsing is suspected.

Bosch Washer - E23 Error Code

The AquaStop leak protection system has detected water.

Meaning

The AquaStop leak protection system has detected water.

The Bosch E23 and F23 error codes indicate that the AquaStop leak protection system has detected water inside the washer’s base pan. Bosch washers use a float switch or moisture sensor to monitor the lower chassis area. When water accumulates—due to internal leaks, loose hoses, pump failures, or over-sudsing—the washer immediately stops operation and triggers E23 to prevent flooding and electrical damage. This is one of Bosch’s most sensitive and safety-critical error codes.

Symptoms

Washer stops mid-cycle with E23 or F23
Visible water under or around the machine
Washer refuses to start a new cycle
Repeated filling and draining attempts

Causes

Leaking drain pump or pump seal
Loose or cracked internal hoses
Over-sudsing causing foam overflow
Door boot tear allowing water to escape
Residual water from a previous spill or transport

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Step-by-Step Fixes

Unplug the washer and inspect the base pan for water.
Dry the base pan completely and restart the washer.
Check internal hoses and clamps for leaks.
Inspect the drain pump housing for cracks.
Reduce detergent usage if over-sudsing is suspected.

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Safety Notes

Do not bypass AquaStop sensors—they prevent flooding.
Always disconnect power before removing panels.

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Applicable Models

Show Models

WAT28400UC
WAT28402UC
WGB86200UC

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Bosch Washer E25 – The turbidity sensor is reporting invalid or no readings.

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Other Bosch Washer Error Codes

Show All Error Codes

Model-Specific Notes

On AquaStop-equipped Bosch models, the inlet valve remains locked until the base pan is fully dry and the sensor resets.

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.