What Does Error Code F23 Mean on a Bosch Washing Machine?
Tilt the machine gently forward about 45 degrees to drain water from the base pan, then leave it upright for at least 30 minutes to dry before restarting — this clears the float switch and resolves the fault in many cases (takes about 30–40 minutes).
Fault description
Error code F23 means your Bosch washing machine has detected water pooling in the base pan — the shallow tray that sits underneath the internal components. This area is not part of the normal water circuit; water should never be there during operation. When moisture reaches a certain level, a float switch inside the base pan rises and sends a signal to the control board, which immediately halts the programme and displays F23.
When this error occurs, the machine will typically stop mid-cycle, lock the door, and may activate the drain pump continuously in an attempt to remove water. You may notice the drum is unresponsive and the display stays fixed on F23. In some cases a small amount of water may be visible beneath the appliance on the floor.
The fault is a safety feature, not a malfunction in itself — it is telling you that a leak has occurred somewhere inside the machine and needs to be investigated before normal use can resume.
Causes
- Leaking door seal or drum gasket — A torn, cracked, or debris-damaged door seal is one of the most common reasons water escapes into the base pan. Water seeps past the seal during the wash cycle and gradually collects below the drum.
- Loose or split internal hose connection — Hoses connecting the drum, pump, and dispenser drawer can loosen over time due to vibration or age. Even a small split or a partially detached clip can allow water to drip steadily into the base pan.
- Faulty or overflowing detergent dispenser — Using too much detergent or a blocked dispenser drawer can cause water and foam to overflow internally rather than entering the drum correctly. This excess liquid can find its way down into the base pan.
- Cracked or damaged pump housing — The drain pump sits low in the machine and is exposed to constant water flow. A crack in the pump body or a failed pump seal can cause a slow but persistent leak directly into the base pan area.
- Faulty float switch staying triggered — Once the base pan has been wet, the float switch can sometimes remain in the raised position even after the water has evaporated or been drained. This keeps the F23 error active even though no active leak is present.
- Tub or outer drum crack — Less commonly, the outer plastic drum can develop a hairline crack, particularly in older machines or after a heavy impact. This allows water to escape the drum during every cycle and accumulate below.
Step-by-Step Fix
- 1
Switch off and unplug the machine
Before doing anything else, turn the programme dial to off and unplug the appliance from the mains. This is essential for safety when water is present near electrical components. Do not attempt to restart the machine until you have completed all checks.
- 2
Drain the base pan by tilting the machine
With help from another person, carefully tilt the machine forward at roughly 45 degrees and hold it there for 30–60 seconds to allow water to drain out from the base. Place towels on the floor beforehand. Once drained, stand the machine upright and leave it for at least 30 minutes to allow residual moisture to evaporate and the float switch to drop back down.
- 3
Inspect the door seal for damage
Open the door and run your fingers around the full circumference of the rubber door gasket. Look and feel for tears, holes, or areas where the seal has pulled away from its groove. Also check for trapped debris such as coins or grit that could be causing a gap. A damaged seal will need to be replaced.
- 4
Check the detergent dispenser and reduce detergent
Remove the dispenser drawer completely and rinse it under warm water to clear any blockages. Check the dispenser housing inside the machine for limescale or detergent build-up. If you have been using more than the recommended detergent dose, reduce it — excess suds are a surprisingly common cause of internal overflow.
- 5
Remove the lower access panel and inspect hoses and the pump
Most Bosch washing machines have a removable kick panel at the bottom front. Unclip or unscrew it and use a torch to look at the visible hose connections and the pump housing. Look for signs of moisture, white limescale deposits (which indicate a slow drip), or obvious splits. Gently press on hose clips to confirm they are seated firmly.
- 6
Run a short test cycle and monitor closely
Once the machine is dry and you have addressed any visible issues, plug it back in and run a short 30-degree cotton cycle. Stay with the machine and check underneath and around the door seal during filling and washing. If F23 returns or you see water escaping, stop the cycle immediately and proceed to professional assessment.
- 7
Reset the error code if the machine is dry and no leak is found
If the base pan was wet but you cannot find an active leak, the float switch may simply need to reset. After ensuring everything is dry, power the machine back on — in many cases the error will clear automatically. If it does not clear, consult your model's manual for the specific reset procedure, which typically involves holding the start button for several seconds.
Affected models
Select your model to see its full troubleshooting page.
When to call a service technician
If you can see an active leak during a test cycle — water dripping from a hose, the pump housing, or the outer drum — do not continue using the machine. These repairs involve disassembling internal components and working near the motor and electrical wiring, which is not suitable for DIY repair. Similarly, if the F23 error returns immediately after the base pan has been fully dried and no obvious cause is found, there may be a crack in the outer tub or a fault with the float switch itself that requires specialist diagnosis.
You should also contact a service technician if the door seal replacement does not resolve the fault, or if water is reaching the base pan rapidly rather than as a slow drip — this suggests a more significant failure that could cause further damage or a safety hazard if left unattended.
Spare parts and service
Visit our partners for spare parts and service
Spare parts
Book a repair
Frequently Asked Questions
Can I keep using my Bosch washing machine while it shows F23?
No. F23 means water is already present in the base pan, and continuing to run the machine risks water reaching electrical components, causing further damage or a safety hazard. Switch the machine off and investigate the cause before using it again.
Will F23 clear itself once the water dries out?
Sometimes, yes. If the base pan dries out completely and the float switch drops back to its resting position, the error may clear when you power the machine back on. However, if there is an ongoing leak, the error will return as soon as the machine fills with water again, so the underlying cause must still be found and fixed.
How do I know if the door seal is causing the F23 error?
Inspect the seal carefully with the door open, feeling for tears, stiffness, or areas where it has detached from the drum rim. You can also run a short cycle and watch the seal closely during filling — any water tracking down the inside of the door glass or dripping from the lower part of the seal points to a gasket problem.
Is F23 covered under Bosch warranty?
If your machine is within the standard warranty period and the leak is due to a manufacturing defect rather than misuse or accidental damage, the repair should be covered. Contact Bosch customer service with your model and serial number to check your warranty status before arranging a paid repair.
How much does it typically cost to repair a Bosch F23 fault?
Cost depends on the root cause. Replacing a door seal is usually a mid-range repair and is something a confident DIYer can do with the right part. A drain pump replacement is similar in cost. If the outer drum is cracked, repair costs can be high enough that replacement of the machine may be more economical, particularly on older models.