Bosch E23 fault codewhat it means and how to fix it
Water has been detected in the base of the machine and the AquaStop system has cut in. Bosch say to turn the tap off immediately and stop using it until it is repaired.
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What E23 means
E23 is the one Bosch code where the manufacturer uses genuinely urgent language, and it deserves to be taken at face value. It means water has collected in the base tray of the machine and the AquaStop leak protection system has triggered. Bosch’s own wording is that there could be water leakage, that you should turn off the water tap immediately, and that you should not use the washing machine until it has been fixed. The Neff manual for the same fault is blunter still: there is water in the base trough, the appliance is leaking, turn off the tap and call service. Two things make this worth stopping for rather than working around. The first is obvious — a leak inside a cabinet that also contains mains electronics is the one hazard a washing machine genuinely has, and the base tray is where a leak collects before it reaches your floor. The second is that AquaStop is a protective system doing its job. Resetting it to get one more wash out of the machine overrides the thing that is currently containing the problem. The immediate actions are simple and you should do them now: turn off the water tap behind the machine, switch it off at the wall and unplug it, and leave it until somebody has looked at it.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Internal hose or connection leaking | A perished sump hose or a loosened clip letting water into the base tray. Common on older machines and one of the more straightforward repairs. | Common |
| Pump or sump seal failed | Water escaping at the bottom of the tub where the pump connects. Tends to worsen steadily rather than suddenly. | Occasional |
| Door seal split at the bottom | A perished boot leaking down the front of the cabinet and collecting underneath. Sometimes visible from outside if you fold the seal back. | Occasional |
| Heavy foaming overflowing the tub | Enough excess detergent can push foam out of the tub and into the base, tripping the sensor without any component having failed. | Occasional |
| AquaStop float or sensor faulty | The protection system reporting water that is not there. Real, but assumed only after a leak has been ruled out rather than before. | Rare |
Can you fix it yourself?
Stop — this needs an engineer
What it costs to fix
Typical repair cost
£90–£260
A hose or clip repair is typically £90 to £160. A pump or tub seal is more, at £150 to £260, because more has to come apart to reach it.
Typical UK prices including parts and labour, updated August 2026. Your quote may differ.
What other owners found
Nobody has shared what worked for them on this code yet. If you have had it, you would be the first — and it genuinely helps the next person.
Related Bosch fault codes
- LEGet it checkedThe machine has lost water it should still have. Samsung label this low water level, and checking for an actual leak is part of their own advice.Related: leaks and overflow
- EF3Stop — call an engineerThe Aqua Control leak protection has triggered and put the machine into a safety mode. Turn the water off at the tap and stop using it.Related: leaks and overflow
- E18Get it checkedThe machine could not pump out in the time allowed. Bosch point at the filter and the drain hose, and warn that the water you are about to release may be scalding.Related: same brand
- E17Get it checkedWater supply time exceeded. Bosch name the AquaStop hose filter as a cause, which is a Bosch-specific part most owners do not know they have.Related: same brand
- E32Usually simple to fixAn unbalanced load. Bosch state explicitly that this is not a fault, and it is the code most often mistaken for a broken machine.Related: same brand
- E16Get it checkedThe door is not locked properly. Bosch group this with E34, F16 and F34 as one fault, and washing caught in the seal is the usual reason.Related: same brand
Common questions about Bosch E23
What should I do right now?
Three things, in this order. Turn off the water tap behind the machine. Switch it off at the wall and pull the plug. Then leave it alone and book someone. Bosch’s own instruction is not to use the machine until it has been fixed, and that is a straightforward instruction rather than a legal disclaimer.
There is no water on my floor. Is it really leaking?
Very possibly, and that is the point of the base tray — it catches the leak before it reaches your kitchen. A dry floor means the protection is working, not that there is nothing wrong.
Can I just tip the machine to drain the tray and carry on?
No. That is a widely shared trick and it defeats the safety system without addressing the leak. You would be running a machine that is putting water into its own base with the sensor emptied so it cannot tell you again.
Could too much detergent have caused it?
It can. Heavy foaming can push suds over the top of the tub and into the base, which trips the same sensor. It is worth mentioning to the engineer if you have had a foaming problem, but it does not change what to do now.
Is this worth repairing?
Frequently yes — a hose or a clip is a modest job. What makes it unpredictable is that the leak has to be found before it can be priced, so expect a diagnosis first and a figure after.
Sources and how we verified this
We establish the facts from the sources below and then write the explanation ourselves. We do not copy manufacturer wording and we do not host their manuals.
- Manufacturer support portal
- Manufacturer technical and service documentation
Checked by Appliance technical reviewer (Qualifications to be displayed on appointment) on 5 August 2026.