EN

Severity: High

Bosch Washing Machine Error E23 – Causes & Fix

Water reached the washer's base pan and the leak protection shut off the supply. Find the leak before reuse.

Safety first · Consult a professional

Water inside the cabinet can reach the wiring. Unplug the washer and close both supply valves before you look inside, and don't keep restarting until you know where the water came from.

  • Unplug the appliance or switch off the breaker before opening any panel. Mains voltage can kill.
  • Water and electricity: unplug first, keep towels ready and never stand in water while the appliance is connected.

At a glance

Severity: 4/5 – High4/5

Severity: High

Meaning
Water in the Base – AquaStop Activated
Typical repair cost
$0–$550
DIY difficulty
Moderate

E:23 (F23 on older Bosch washers) means the float switch in the base pan under the tub has lifted: water has collected inside the cabinet. Bosch's AquaStop system then stops filling and runs the drain pump so nothing more reaches your floor; on 800 Series compacts this is sold as AquaStop Plus alongside the AquaShield supply hose. The leak can be as simple as a pump cover that wasn't screwed tight after cleaning or suds from too much or non-HE detergent spilling out of the dispenser. A torn door boot, a loose internal hose or a cracked pump housing are the harder cases. The code usually stays until the base pan has drained and dried.

How it looks on the display

Bosch Washing Machine display showing error E23

Model families & display variants

Model familyShowsNote
800 Series compacts with AquaStop PlusE:23Base-pan leak detection shuts down the cycle and pumps out water automatically.
300 and 500 Series compactsE:23Manual describes it as water in the base: turn off the water and call service if it repeats.
Older Axxis and Nexxt washersF23Same AquaStop message with the F prefix.

Symptoms

  • E:23 on the display and the cycle stops
  • Drain pump keeps running although the drum is empty
  • Puddle or damp spot under or in front of the washer
  • Foam visible around the detergent drawer or door
  • Code returns shortly after each restart

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Drain pump cover loose or cross-threaded after cleaning 22%
  2. Oversudsing from too much or non-HE detergent spilling from the dispenser 20%
  3. Door boot torn or a sock trapped in its fold 14%
  4. Internal hose or clamp leaking (fill or drain hoses inside) 14%
  5. Detergent dispenser housing clogged and overflowing 10%
  6. Cracked tub, pump housing or dispenser 10%
  7. Float switch stuck or wiring fault (false alarm) 10%

Fix it step by step

Diagnostic flow: E231Shut everything off2Check the pump cover3Rule out suds4Inspect the door boot5Drain the base pan6Watch a test cycle

  1. Shut everything off

    Unplug the washer and close hot and cold valves. Mop up any water on the floor and note where the puddle is thickest – front, back, left or right.

    Tools: Towels & shallow pan, Flashlight

  2. Check the pump cover

    Open the service cover at the bottom front. If the area is wet, unscrew the pump cover, clean lint from the threads and screw it back in firmly until the handle stands vertical.

    Tools: Flashlight, Gloves

  3. Rule out suds

    Look for foam around the drawer, door and back. If you used regular detergent or a heavy dose, run a Rinse cycle empty and switch to a smaller dose of HE detergent from now on.

    Tools: Flashlight

  4. Inspect the door boot

    Pull back the folds of the rubber door boot all around. Remove trapped socks or coins and look for splits, especially at the bottom where the water sits.

    Tools: Flashlight

  5. Drain the base pan

    With a helper, tip the washer back a few inches over towels so the water in the base pan runs out. Then leave it unplugged for about a day so the float drops back down.

    Tools: Towels & shallow pan

  6. Watch a test cycle

    Run Rinse/Spin empty with the service cover open and a flashlight ready. Paper towels laid under the washer show where drips land and point you to the leaking part.

    Tools: Flashlight, Towels & shallow pan

How to reset E23

  1. Turn the cycle selector to Off and unplug the washer.
  2. Fix the leak and let the base pan dry out completely.
  3. Plug in, open the valves and run a short Rinse/Spin while you watch for drips.
  4. If E:23 returns during the test, keep the valves closed and call Bosch service.

Where the parts are

Washing machine: drain filter, pump and door lock – E2312345678
Washing machine: drain filter, pump and door lock
  1. 1Door lock
  2. 2Water inlet valve
  3. 3Water level sensor
  4. 4Filter
  5. 5Drain pump
  6. 6Motor
  7. 7Heating element
  8. 8Temperature sensor

Repair options & costs

RepairDIY?Estimated cost
Reseat and clean the pump cover Yes $0
Switch to HE detergent, clean the dispenser Yes $0–$15
Internal hose or clamp repair by a technician No $150–$280
Door boot replacement No $160–$320
Tub, pump housing or float switch replacement No $250–$550

Rough US estimates; technician call-out fees vary by region. Not a quote.

When to call a technician

Call Bosch service if you can't find an obvious cause like a loose pump cover or suds, if water appears again during the test cycle, or if the washer sits above a finished floor where a leak would do damage. Keep the water valves closed until it's fixed.

Frequently asked questions

Can I just reset E:23 and keep washing?

Only once you know why water got into the base. The code is there to prevent floor damage; restarting with an active leak just fills the base pan again.

E:23 showed up right after I cleaned the pump – why?

The pump cover is the most common leak after maintenance. Lint on the threads or a cover that isn't turned in fully lets water seep into the base pan.

Does AquaStop also protect against a burst supply hose?

The AquaStop Plus base detection covers leaks inside the washer. On models with the AquaShield hose, a separate valve in the hose shuts off the water if the hose itself leaks.

Sources