Bosch Dishwasher E15 Error Code: What It Means & How to Fix It
The E15 code on a Bosch dishwasher means the float switch in the base pan has detected water where it shouldn't be, triggering the Aquastop leak-protection system to shut the unit down and lock out further cycles until it's resolved.
Safety note: Always unplug the dishwasher (don't just turn it off at the panel) before inspecting the base pan.
Common causes
An actual small leak
A leaking hose connection, tub seal, or pump gasket can drip into the base pan and trip the float switch — this is the most common real cause.
Condensation buildup
In some cases, normal condensation collecting in the base pan over time is enough to trip a sensitive float switch.
A stuck or faulty float switch
The float switch itself can stick in the 'up' position or fail electrically, triggering E15 even with no water present.
Overfilling or a door seal issue
A worn door gasket or overfilled tub can let water escape into the base during a cycle.
What to check first
Unplug the dishwasher and check the base pan
Remove the front kickplate panel to see if there's visible standing water in the base pan.
Absorb and dry any water
If you find water, soak it up with a towel and check whether the float switch (a small cylindrical float) moves freely.
Inspect visible hose connections
Look at the accessible water inlet and drain hose connections for drips or looseness.
Reset the dishwasher
After drying the base pan, power the unit back on to see if E15 clears. If it returns quickly, there's likely an active leak.
When to call a technician
E15 should never be ignored or repeatedly reset — if water is actively leaking, it can damage flooring and cabinetry. If you can't find or reach the source of the leak, or the code returns after drying the base pan, a technician should pressure-test the connections and inspect the pump seal and float switch.
Frequently asked questions
Can I still use my dishwasher with an E15 error?
No — the Aquastop system locks the dishwasher out of running cycles specifically to prevent water damage. It needs to be resolved before running it again.
Does E15 always mean I need a new part?
Not always — sometimes drying the base pan and confirming there's no active leak resolves it. But if it recurs, a component (pump seal, hose connection, or float switch) needs replacement.
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