The E15 error on your Bosch Dishwasher means the appliance has detected water in the base pan, triggering the built-in leak protection system (Aquastop). Most of the time this is caused by a small leak, condensation build-up, or a faulty float switch, and it can often be fixed without calling an engineer.
| Error code | E15 |
|---|---|
| Meaning | Water leak detected in the dishwasher's base pan (Aquastop triggered) |
| Severity | High — the machine will not run a wash cycle until this is cleared |
| Time to fix | 15–45 minutes |
| Tools needed | Torch, towels, screwdriver, sponge/wet vacuum |
What the E15 error means
Bosch dishwashers have a safety feature called Aquastop, which sits at the base of the machine and monitors for water where it shouldn't be. When the float switch in the base pan detects standing water, it trips the E15 code and locks the dishwasher out of running further cycles to prevent flooding or electrical damage.
This is a protective error rather than a sign the dishwasher is broken, but it does need to be investigated and cleared before the machine will work again.
Common causes
- A small leak from a hose connection, the door seal, or the water inlet valve
- Condensation collecting in the base pan over time
- A stuck or faulty float switch that triggers even without a real leak
- Overfilling with detergent or rinse aid causing suds to overflow internally
- A cracked or damaged tub, spray arm, or sump area
- Debris or grease build-up interfering with the base pan sensor
How to fix the E15 error
- Switch off and unplug the dishwasher. Always disconnect power before inspecting the base or removing panels, for safety.
- Tilt the dishwasher forward carefully. Gently tilt or pull the machine out to check underneath for pooled water, and mop up any standing water with towels or a wet vacuum.
- Remove the lower front panel. Use a screwdriver to access the base pan and float switch, then check the switch moves freely and isn't stuck in the "up" (triggered) position.
- Inspect hoses and seals. Look at the door gasket, water inlet hose, and drain hose connections for cracks, looseness, or drips, and tighten or replace as needed.
- Dry the base pan fully. Use a cloth or sponge to remove all moisture from the pan before resetting the switch back to its normal position.
- Restore power and run a test cycle. Plug the dishwasher back in and run a short cycle to confirm the E15 code has cleared and no new leak appears.
FAQ
Can I keep using the dishwasher after an E15 error?
No. The machine locks out further cycles until the water is cleared and the float switch resets, so it needs to be checked before running again.
Does E15 always mean there's a real leak?
Not always. Sometimes condensation or a stuck float switch can trigger the code even without an active leak, so a full inspection is worth doing before assuming a part has failed.
Should I call an engineer for this error?
If you've checked hoses, seals, and the float switch and the error keeps returning, it's best to call a qualified engineer, as it may point to a tub crack or internal fault. For general appliance troubleshooting guidance, you can also check resources like this Bosch Drill Won'T Start: Causes and How to Fix It guide for tips on diagnosing common Bosch product faults.
