Bosch Dishwasher Error Code E15 - AquaStop Flood Protection Activated

Medium Severity

The base pan beneath the dishwasher has accumulated water, causing the styrofoam float switch to rise and trigger the AquaStop safety system, continuously running the drain pump.

Appliance: Bosch Dishwashers

Estimated Time: 30-45 minutes

Tools Required: Towels, Torx T20 screwdriver, fan

⚠ Common Symptoms & Observations

Dishwasher beeps continuously; water tap symbol illuminates; drain pump runs constantly even when the door is opened or the unit is powered off.

🔍 Root Causes for Code E15

Excess suds from regular dish soap used mistakenly
minor leak from the sump gasket seal
loose spray arm or cracked water supply hose inside the base
door seal gasket degradation.

🔧 Step-by-Step DIY Troubleshooting & Fix Guide

Cut power immediately at the circuit breaker or unplug from the under-sink outlet.

Turn off the water supply valve under the sink.

Pull the dishwasher out slightly and tilt it backward at a 45-degree angle for 30-60 seconds over old towels to allow trapped water in the bottom safety pan to drain out.

Allow the base pan and float switch to dry completely for 12 to 24 hours with a fan.

Inspect the sump gasket inside the tub; tighten the 4 Torx T20 screws holding the sump down if loose.

🔄 Master Reset Procedure for Bosch

Once the base pan is 100% dry, press and hold the 'Start' button for 5 seconds until the display shows '0:01', close the door, and wait for the 1-minute reset cycle to conclude.

Technician Tip: If the error code reappears immediately after a hard reset, the control board has detected an active electrical open circuit or failed component that requires physical inspection.