Bosch Washer E23 — What It Means & How to Fix It
Also shown as F23 on some models.
Bosch's E23 — F23 on some displays — means the washer's AquaStop leak protection detected water in the base tray and cut the machine off to stop a flood, sometimes from a genuine leak but often from overfoaming, a hose weep, or a spill during a move.
What this code means
A float in the base pan trips the AquaStop system the instant it senses standing water; the machine then locks out and usually pumps down, often lighting a tap symbol. On a washer that water can come from a split or loose hose, an overfilled detergent drawer foaming over, or simply from tilting the machine during transport — the sensor can't tell a real leak from a harmless one, so it errs on the side of stopping.
E23 and F23 are the same AquaStop trip. Because it can signal an active leak, Bosch's own advice is to close the tap first and call service rather than keep restarting — worth doing before assuming it was a one-off.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Overfoaming from too much or non-HE detergent spilling into the base | Common | Yes — detergent check |
| One-off water in the base from a spill, overfill, or moving the machine | Common | Yes — dry out |
| Loose or weeping hose connection at the pump or tub | Occasional | Partly — visible checks |
| Split hose, failed door seal, or cracked sump — an active internal leak | Less common | No — technician job |
What you can try yourself
- Close the water tap straight away and unplug the machine — E23 can mean water is actively escaping, so stopping the supply comes first.
- Look at the floor and under the front of the washer: a genuinely wet floor means a real leak, while a dry floor with E23 showing often means only a little water reached the base and tripped the float.
- Recall the last cycle — heavy or non-HE detergent foaming over, an overloaded drawer, or the machine being tilted recently can all put water in the base without anything breaking.
- Leave the washer unplugged with the door and detergent drawer open for several hours so the base can dry, tip out any obvious drawer suds, and wipe the seal.
- With the tap still off, restore power and start a short rinse while watching underneath. Fresh water appearing means the leak is real — leave the tap off and book a technician.
When to call a technician
- Fresh water is pooling under or behind the machine, an active leak rather than a false trip.
- E23 returns on the next cycle even though there was no foam-over or spill to explain it.
- The washer keeps pumping and won't run any program after drying out overnight.
Typical professional repair cost: A diagnostic visit runs $80–$160; replacing a leaking hose, seal, or the AquaStop assembly commonly totals $150–$350.
Frequently asked questions
How do I reset a Bosch washer E23 or F23?
Close the tap, unplug the machine, and let the base pan dry for several hours with the door open. If water only reached the base from foam or a spill it will restart cleanly; if E23 comes straight back, treat it as a real leak and stop using the machine.
Is Bosch E23 always a serious leak?
No. The AquaStop float trips on any water in the base, so overfoaming, an overfilled drawer, or tilting the machine during a move can set it off with nothing broken. It becomes serious when the floor is wet or the code returns after a full dry-out.
Can too much detergent cause E23 on a Bosch washer?
Yes. Excess or non-HE detergent can foam up and over the drawer or tub, and that water reaching the base pan is enough to trip AquaStop. Running a rinse cycle and cutting back to the correct HE dose often clears it.
Related Bosch codes
- Bosch Washer E17 Bosch's E17 — shown as F17 or F29 on some models — means the washer couldn't draw water quickly enough to fill, almost always because the inlet-hose filter screen is clogged, the tap isn't fully open, or household water pressure is low.
- Bosch Washer E18 Bosch's E18 — the F18 display on some models — means the washer couldn't drain within the expected time, most often because the pump filter is clogged with lint and coins or the drain hose is kinked or pushed too far down the standpipe.
- Bosch Washer E16 Bosch's E16 — displayed as E34, F16 or F34 on some models — means the door isn't locking, so the machine refuses to start, most often because a bit of laundry is caught in the seal or the door wasn't pushed until it clicked.
- Bosch Washer E32 Bosch's E32 — F32 on some models — means the drum couldn't balance the load for the spin, so the machine slows or skips the high-speed spin to protect itself, usually because of a single bulky item or a tangled clump on one side.
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