Bosch Dishwasher E15 Error Repair in Port St. Lucie, FL

Quick symptom overview

Bosch 100, 300, 500, 800, and Benchmark Series dishwashers display E15 alongside a flashing Tap Water Supply Symbol on front or top-edge digital displays when the main electronic power control module (12008381, 12008380, 11032194) senses that AquaStop Safety Base Pan Microswitch 00611322 (supersessions 00165256, 00611322, 00631200) has been actuated by standing water lifting a circular styrofoam float disc.

The flood safety protection system consists of: Main Control Module → lower base pan wiring loom → Microswitch 00611322 (Pin 1 & 2 NO/NC contacts) → Styrofoam Float Disc → sealed plastic base frame → Drain Pump 00611332. When as little as 1/4 inch (200 mL) of water leaks into the lower pan frame from a failed Sump Seal Gasket 12005744, water inlet valve, or water softener matrix, the floating foam disc rises, tripping switch 00611322. The main PCB immediately enters flood protection mode: locking out controls and running Drain Pump 00611332 continuously—even with the door open or power button toggled off.

E15 code with continuous pump noise: Water present in base tray holding safety float disc UP. E15 code after using liquid hand soap: Over-sudsing caused foam to spill out over sump sides into the base. Related Bosch dishwasher & appliance diagnostic guides: Bosch E15 flood sensor & base pan guide, Bosch E23 drain pump circuit guide, and Bosch E09 heat pump guide. Local service page: Bosch appliance repair.

Safety: Unplug 120V AC power cord or switch off 15A double-pole breaker panel before removing front kickplate panels or absorbing water around electrical base switches.

Step-by-step diagnostic hierarchy

1. Dry base tray water and inspect float disc (Power OFF — simple check) — Disconnect 120V power cord:

   • Remove 2 Torx T20 screws securing lower metal toe-kick plate at floor level.
   • Pull away black acoustic felt insulation pad to expose white plastic base frame.
   • Inspect plastic trough underneath stainless tub:
   • If standing water is present: Soak up all water completely using a sponge, towel, or shop vacuum until white styrofoam float disc 00611322 sits flush against base floor.
   • Restore power: If E15 clears: Proceed to Step 2 to locate the water leak source.

2. Test Base Pan Microswitch 00611322 continuity (Power OFF — meter check) — Keep power disconnected and unclip 2-wire connector plug from microswitch 00611322:

   • Set multimeter to 200 Ω scale:
     • Measure across terminals with float disc lying FLAT (rest position): Expected: ∞ Ω (Open circuit).
     • Lift float disc manually UP with finger: Expected: < 0.5 Ω (Closed circuit).
   • Result: < 0.5 Ω with float disc resting flat: Microswitch internal contacts welded shorted → replace Base Flood Switch 00611322.

3. Pinpoint leak source during test cycle (Power ON — visual check) — With base dry and kickplate off, restore power, select short wash cycle, and shine flashlight into base:

   • Check Stainless Sump Bowl Perimeter: Look for water droplets seeping around black rubber tub-to-sump gasket (12005744). (Install Bosch Sump Gasket Repair Kit 12005744).
   • Check Water Inlet Valve 00628334: Inspect solenoid supply hose connection on left front corner.
   • Check Water Matrix (Heat Exchanger): Inspect clear plastic fill tank on left outer side panel for cracks or overflow.

4. Verify Drain Pump 00611332 coil (Power OFF — pump check) — If pump fails to clear water:

   • Unclip 3-pin connector on BLDC pump 00611332: expected 15 Ω to 22 Ω across any 2 pins.

Multimeter and safety checks

Disconnect 120V AC power supply before taking resistance measurements on base microswitch terminals or control board header connectors.

Component / Test	Setup & Meter Range	Expected Normal Value	Fault / Failure Mode
Base Microswitch (Flat)	Switch terminals 1 & 2, 200 Ω	∞ Ω (Open)	< 0.5 Ω (contacts stuck closed; logs E15 continuously)
Base Microswitch (Lifted)	Switch terminals 1 & 2, 200 Ω	< 0.5 Ω (Closed)	∞ Ω (broken switch actuator lever)
Drain Pump Winding	Across BLDC pump pins, 200 Ω	15 Ω–22 Ω	∞ Ω (open pump winding)
Inlet Solenoid Coil	Valve 00628334 pins, 2k Ω	1.2 kΩ–1.6 kΩ	∞ Ω (open inlet valve coil)

Root cause vs repair breakdown

Observable Symptom	Root Cause / Faulty Part	Corrective Repair Action
E15 code, water in base tray	Seeping rubber sump gasket or loose water hose	Install Bosch Sump Seal Repair Kit 12005744; dry tray
E15 code, base tray dry ok	Welded internal contacts inside base switch	Replace Base Pan AquaStop Microswitch 00611322
E15 code after over-sudsing	Non-HE detergent created foam overflow	Sponge out suds; run rinse cycle with 1 cup cooking oil
E15 code, water dripping left	Cracked plastic heat exchanger / water matrix	Replace Water Matrix Assembly 00668114

FAQ

What does error code E15 mean on a Bosch 100, 300, 500, or 800 series dishwasher?

E15 (Base Pan Water Safety Trigger) indicates an Active Leak in Lower Base Tray. The electronic main power module (12008381 / 12008380) detects that standing water accumulated in the plastic base tray, lifting styrofoam float disc 00611322 and closing safety microswitch 00611322 to trigger flood protection.

How do I clear error code E15 on a Bosch dishwasher?

Unplug dishwasher or flip 15A circuit breaker off. Remove lower front metal kickplate panel and sound insulation. Soak up standing water in the bottom plastic pan using a sponge or shop vacuum until styrofoam float disc drops flat. Restore power: if E15 clears, locate and repair the underlying water leak source.

Why does my Bosch dishwasher drain pump keep running even when turned off?

The E15 safety microswitch overrides normal user controls to keep drain pump 00611332 energized continuously 24/7 to prevent water from overflowing onto kitchen flooring.

What causes water to leak into the Bosch dishwasher base pan?

Degraded silicone sump bowl seal (P/N 12005744), loose water inlet valve 00628334 connection, cracked plastic water matrix heat exchanger, or excessive suds from non-HE liquid dish soap.

When to schedule professional service

If main control module replacement, under-tub silicone sump seal overhaul, or water matrix heat exchanger replacement is required, certified Bosch dishwasher repair technicians are ready to assist. Schedule Bosch dishwasher repair → or contact our technical service team.