FixByModel
E15

Bosch E15: Anti-flood float detected water in base tray

The AquaStop safety system sensed water pooling in the base pan under the tub and shut the dishwasher down to prevent a floor leak. A float switch in the base triggers the code and blocks operation until the base is dry.

DIY fix

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Small leak collecting in the base tray (loose hose clamp, worn door gasket, or leaking salt reservoir cap)
  2. Excess suds from too much or wrong detergent overflowing into the base
  3. Loose or damaged inlet/drain hose connection
  4. Faulty inlet valve or AquaStop hose assembly
Where water collects
1Door gasket
2Hoses & sump
3Base tray
4Float switch

Schematic illustration of a typical dishwasher — not your exact model.

Before you start — unplug the appliance and turn off the water supply. You'll be working near water and electrical parts, and drained water can be hot. If a step involves the pump, wiring, or opening the cabinet and you're unsure, stop and call a qualified technician.

Step-by-step fix

1Cut powerDisconnect the dishwasher from power for about 5 minutes to reset the control after the water is cleared.
2Drain the base trayPut towels down, then carefully tilt the unit forward about 45 degrees so trapped water in the base pan runs out and the float drops back down.
3Check the door sealRun a finger around the rubber tub gasket feeling for tears, flat spots, or gaps that would let water escape onto the base.
4Check the salt capIf the machine uses regenerating salt, make sure the salt reservoir cap and its O-ring are screwed down fully so water cannot seep into the base.
5Review detergentUse only dishwasher detergent in the correct dose; sudsing from hand soap or overdosing can overflow and trip the float.
6Run a test cycleRestore power and run a short cycle. If E15 returns quickly, a persistent leak needs a technician to trace and seal it.

Still showing E15?

If you’ve worked through every step and E15 keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

Bosch dishwashers. Bosch dishwashers equipped with the AquaStop / anti-flood leakage-protection system (most Ascenta, 300, 500, 800 series and comparable EU Serie models).

FAQ

What does Bosch E15 mean?

Anti-flood float detected water in base tray. The AquaStop safety system sensed water pooling in the base pan under the tub and shut the dishwasher down to prevent a floor leak. A float switch in the base triggers the code and blocks operation until the base is dry.

What causes Bosch E15?

The most likely cause is small leak collecting in the base tray (loose hose clamp, worn door gasket, or leaking salt reservoir cap). Other causes include Excess suds from too much or wrong detergent overflowing into the base; Loose or damaged inlet/drain hose connection; Faulty inlet valve or AquaStop hose assembly.

Can I fix Bosch E15 myself?

Usually yes. Start by working through the steps above, beginning with: disconnect the dishwasher from power for about 5 minutes to reset the control after the water is cleared.