If your Bosch washer shows the E23 or F23 error code, it means the machine has detected water leaking or flooding. This safety feature is designed to stop operation immediately to protect your home from water damage. While this alert can feel alarming, the washer is simply preventing further problems. With a few quick checks, you can often identify the cause and take safe next steps.

What does the E23 / F23 error mean?

The Bosch washer E23 error or Bosch washer F23 error points to a leak sensor activation. Modern Bosch washers are equipped with a sensor in the base tray that monitors for excess water. If moisture or flooding is detected, the washer shuts down automatically to avoid electrical damage and spills.

This issue can result from something simple, like a loose drain hose, or more serious internal faults such as a leaking tub seal or failed pump. In some rare cases, a defective sensor may also trigger the alert.

Common causes

Several factors can cause the Bosch washing machine leak sensor error:

• Leaking Hoses
  • Inlet or drain hoses can loosen, crack, or detach, allowing water to escape.
• Internal Leaks
  • Components such as the pump, tub, or seals may degrade over time and start leaking.
• Blocked Detergent Drawer or Overflow
  • Using too much detergent can create excess suds, pushing water and foam into areas the washer can’t manage.
• Water in the Base Tray
  • Even small leaks can collect in the tray, triggering the leak sensor.
• Faulty Leak Sensor
  • Although rare, a malfunctioning sensor may detect water incorrectly.

How to fix the E23 / F23 error

Here are the steps you can safely try at home:

• Unplug the Washer and Turn Off Water Supply

  Always prioritize safety—disconnect electricity and water before inspecting leaks.

• Inspect the Hoses

  Check inlet and drain hoses for cracks, loose fittings, or blockages. Tighten or replace if necessary.

• Check the Detergent Drawer and Seals

  Clean out detergent residue and look for any signs of leaks around the door gasket or drawer.

• Tilt the Washer to Drain the Base Tray

  Carefully tilt the machine forward or sideways to let trapped water escape. This can temporarily clear the error but doesn’t resolve the underlying cause.

• Restart the Machine

  After resetting, monitor for recurring leaks. If water reappears, the issue is internal and requires service.

When to call a technician

Professional repair is recommended if:

• Water continues to collect in the base tray.
• Hoses, pumps, or seals are visibly damaged.
• The Bosch washer flooding error reappears after resetting.
• The leak sensor itself is faulty.

A certified Bosch technician can identify the exact source, test the sensor, and replace faulty parts safely.

Conclusion

The E23 / F23 leak error in Bosch washing machines is a protective feature that signals water leakage or flooding. While small leaks from hoses or detergent overflows may be manageable with DIY fixes, persistent issues or damaged components require professional repair. Acting quickly ensures your washer stays safe, prevents water damage, and restores reliable performance.