What does the washing machine Error E23 / F23 mean?

These error codes indicate that the AquaStop Hose has been activated.

Why am I getting this washing machine error code?
The washing machine AquaStop system is responsible for leakage protection, so if you're getting this error, there could be water leakage. Do not use the washing machine until it has been fixed.

How can I troubleshoot for a washing machine error code E23 or F23?
Turn off the water tap immediately as there may be a water leak. Please contact Bosch Customer Support as soon as possible at 1-800-944-2904.

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