The "E15" error code displayed on Bosch, Siemens, and similar European residential dishwashers specifically means that water has leaked or accumulated inside the sealed bottom base pan, causing a styrofoam float element to rise and activate the anti-flood microswitch. This safety protocol locks the dishwasher out of operation to prevent water damage to your kitchen floor. The water in the pan may stem from a loose hose clamp, a minor door seal drip, or heavy condensation. You can troubleshoot base pan leaks safely by unplugging the unit. You can verify that your corrective action is successful when tilting the appliance to drain the base tray and drying the sensor clears the error code permanently.
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