On Siemens and Bosch group dishwashers, the "E15" error code indicates that water has accumulated in the bottom base pan, triggering the styrofoam flood safety float switch. To reset this error, you cannot simply press a button because the physical water must be removed. First, disconnect the dishwasher from electrical power for safety. Second, pull the unit out of its cabinet and carefully tilt the entire appliance backward at a 45-degree angle into a shallow basin to let the trapped water drain out of the base pan. You can troubleshoot flood safety systems easily. You can verify that your corrective action is successful when the float switch drops back down, allowing you to restore power and run a test cycle without the E15 code returning.
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