📊 Technical Thresholds, Pinout & Pass/Fail Specifications
| Parameter / Component | Normal / Verified Spec | Fault / Trigger Condition |
|---|---|---|
| Safety System | Bosch AquaStop / AquaSensor Flood Protection | Out-of-tolerance reading triggers E15 / Tap Symbol protection state |
| Actuation Mechanism | Styrofoam float activates microswitch at ~150ml of pooled water | Inspect wiring harness & replace 12005744 / 00668108 if out of spec |
| Failsafe Behavior | Inlet valve closed; drain pump forced ON indefinitely until pan is dry | Verify continuity and clean terminal connectors before clearing E15 / Tap Symbol |
| Most Common Leak Source | Sump bowl seal degradation or loose sump screws | Recalibrate in service mode after restoring factory parameter range |
Understanding the Bosch Dishwasher E15 Safety Lockout
Unlike standard dishwashers that simply stop running during a leak, Bosch dishwashers feature a sealed plastic basin underneath the tub called the base pan. Nestled in this pan is a circular styrofoam float disc. If as little as 1/2 cup of water leaks from the pump, door gasket, or sump basin, the styrofoam float rises and trips a microswitch. This activates the E15 error code, illuminates the red water tap symbol, and forces the drain pump to run continuously to prevent flooding your kitchen floor.
How to Safely Drain the Base Pan and Reset E15
- Kill Power: Flip the kitchen circuit breaker controlling the dishwasher off immediately. The drain pump will continue to run even with the door open until power is disconnected.
- Tilt the Dishwasher Backward: Pull the dishwasher forward out of the cabinet cavity by 6 inches. Lay down several thick towels behind the machine, and gently tilt the entire unit backward at a 45-degree angle. Trapped water will spill out onto the towels from the base pan corners. Hold for 60 seconds until dripping ceases.
- Dry and Power On: Return the unit upright. Use a hairdryer on cool/low heat through the lower kickplate to dry any residual moisture on the styrofoam switch. Restore power. The E15 code will be gone.
- Permanently Seal the Sump: If E15 returns within a few weeks, the factory silicone sump gasket has relaxed. Remove the lower spray arm and filters, tighten the four T20 Torx screws around the sump perimeter, or install the official Bosch Sump Repair Silicone Ring (OEM Part #12005744).
❓ Frequently Asked Technical Questions (FAQ)
Why does the drain pump keep running with the door open?
This is a built-in flood prevention safety feature of Bosch's AquaStop technology. The control board will not stop the drain pump until the styrofoam float rests completely flat.
Can using too much dish soap or regular dish liquid trigger E15?
Yes! Excessive suds spill out of the tub air vents into the bottom base pan, raising the float and triggering E15. Once the foam dissipates and dries, the code clears.
Do I need to pull the dishwasher out to fix E15?
Tilting the machine is the fastest way to drain the pan, but you can also remove the front kickplate (toe-kick) and soak up the water using a sponge and towels without pulling the machine out.