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boschError Code E15Moderate — basic toolsModerate safety risk — read warnings

Bosch Dishwasher E15 Error: Causes and Fixes

Updated June 22, 20263 min readTime needed: 20–40 minutes
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Short answer: E15 means Bosch's Aquastop float switch has detected water pooling in the base pan, so the dishwasher locks out further water intake as a flood-prevention measure. The fix is finding and clearing the source of that water.

Common Symptoms

  • 'E15' displayed and the dishwasher stops filling or running
  • A small amount of water visible in the base of the unit when the kick plate is removed
  • The dishwasher ran a normal cycle previously but now won't start
  • Error persists across multiple attempts to restart

Likely Causes

1. Residual water from a previous overflow or leak

Even a small, already-stopped leak can leave enough water in the base pan to trigger the float switch.

2. A cracked or loose hose connection

The fill or drain hose fittings inside the unit can loosen over time or with vibration, dripping slowly into the base pan.

3. Foam from too much or the wrong detergent

Excess suds can escape the tub and drip down into the base, tripping the same sensor as an actual leak.

4. Condensation buildup

In rare cases, unusually heavy condensation inside the unit can accumulate enough to trigger the sensor.

Safe Checks You Can Do

  • Turn off power to the dishwasher at the breaker before removing the lower kick plate.
  • Look for standing water in the base pan once the kick plate is off.
  • Check that you're using dishwasher-specific detergent, not dish soap, which foams excessively.
  • Inspect visible hose connections at the front of the unit for drips or looseness.

Step-by-Step Solution

  1. 1

    Cut power and access the base pan

    Turn off the breaker, then remove the toe-kick panel at the bottom front of the dishwasher (usually just a couple of screws or clips).

  2. 2

    Soak up any standing water

    Use a towel or small wet/dry vacuum to remove all water from the base pan so the float switch can reset.

  3. 3

    Check for an active drip

    With the panel still off, run a short cycle and watch closely for a few minutes to see if water is actively dripping from a hose or fitting.

  4. 4

    Tighten or address the source

    If you find a loose connection, tighten it by hand — avoid overtightening plastic fittings. If detergent foam is the cause, switch to a low-foam dishwasher detergent.

  5. 5

    Reset and test

    Reassemble the panel, restore power, and run a normal cycle to confirm the error doesn't return.

What Not to Do

  • Don't ignore the E15 code and keep restarting the cycle — this can allow a real leak to continue unnoticed.
  • Don't use regular dish soap in a dishwasher — the foam it produces can trigger this exact error and cause overflow.
  • Don't overtighten plastic hose fittings when checking connections — this can crack them and create a new leak.

When to Call a Professional

  • You find an active leak from a hose, pump seal, or tub fitting that isn't a simple loose connection.
  • Water reappears in the base pan shortly after being dried out with no obvious external cause.
  • You're not comfortable removing the kick plate or working near the unit's internal wiring.
  • The dishwasher is under warranty — DIY disassembly may affect coverage, so check your terms first.

Safety warning

Always disconnect power at the breaker before removing any panel or working near water and electrical connections together. If you cannot locate the source of water, treat it as a potential leak and have it inspected rather than repeatedly resetting the machine.

Frequently Asked Questions

Can I just dry out the base pan and keep using the dishwasher?

Only as a short-term step. If the underlying source of water isn't a one-off (like leftover suds), the E15 code will return, and a real leak left unaddressed can cause water damage over time.

Is E15 the same as a flood-safety shutoff?

Yes — it's specifically Bosch's Aquastop system, designed to stop the unit before a leak becomes a flood.

What detergent should I use to avoid this?

Use a dishwasher tablet or powder formulated for machine use, and measure it correctly — too much of even the right detergent can cause excess foam.

Home Solutions Editorial Team

Reviewed against manufacturer documentation. Updated June 22, 2026. How we write guides

Sources & Further Reading

  • Error code meanings may vary by model. Check your appliance manual before attempting any troubleshooting.

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