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Bosch Washer E23 / F23 Error Code
Leak detected or AquaStop triggered. Here is what it means and how to clear it, easiest fix first.
The AquaStop leak protection has been triggered, which normally means water has collected in the base of the machine because something inside or in the hose is leaking. Bosch says to close the water tap and not use the washer again until it has been repaired.
On some newer US models the display alternates E:00 and -23 for water in the base or a leak. Listed on Bosch's US support site; Bosch models sold in the UK and Europe may use a different code, so check your manual.
How to fix Bosch E23 / F23
Turn the water off right away
Close the water tap that feeds the washer. If there is water on the floor near the outlet or cord, switch off the washer's circuit breaker rather than touching the plug, then unplug it once the area is dry.
Look for an obvious outside leak
With the power off, check whether water is coming from the inlet hose connection at the tap or from the drain hose. Note what you find for the technician, but do not take panels off the machine.
Leave the washer off
Do not restart the washer to see if the code clears. Running it with a leak can damage the floor and the machine.
When to call a technician
Book a technician for this code. The leak source inside the machine and the AquaStop system need to be checked and repaired before the washer is used again.
Parts that commonly cause E23 / F23
- AquaStop inlet hose
- Internal hoses and seals
- Leak sensor (float switch)
Order parts by your exact model number so they fit.
Other Bosch washer codes
- E18 / F18Washer is not draining
- E17 / F17Water is not coming in fast enough
- E16 / F16Door is open or not locked
- E32 / F32Load is off-balance
- E33 / F33Too much suds
- E:30Water level problem (read the number after the code)
- E:36Drain pump blocked
- E:10i-DOS dosing pump blocked
- H9EHot water supply problem
- E19 / F19Water is taking too long to heat
- E20 / F20Unexpected heating
- E25 / F25Turbidity (water clarity) sensor fault
- E26 / F26 / F27Water level (pressure) sensor fault
- E28 / F28Flow sensor fault
- E56Internal communication error
- E80Motor drive circuit fault
- CLChild lock is on
Frequently asked questions
What does E23 / F23 mean on a Bosch washer?
The AquaStop leak protection has been triggered, which normally means water has collected in the base of the machine because something inside or in the hose is leaking. Bosch says to close the water tap and not use the washer again until it has been repaired.
Can I fix Bosch E23 / F23 myself?
Only the basic checks. You can safely try the steps above, but E23 / F23 usually points to a part or fault that needs a technician.
What if E23 / F23 keeps coming back?
A code that returns after a reset and the checks above usually means a part is wearing out. Note when E23 / F23 appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.
Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.