How to Enter Diagnostic Mode on a Bosch Dishwasher

Bosch dishwashers display E-codes and have a built-in test program entered with a button-hold sequence at power-on.

Step-by-Step: Bosch Dishwasher Diagnostics

1
Read the E-code from the display (E15, E24, E25…). On non-display models, cycle LEDs encode the fault per the manual.
2
Test program on most models: hold the Start button and the left-most program button together, then switch the unit on (sequences vary by series — some use holding both outer program buttons while powering on). The display then shows stored faults and runs a test cycle. Your model's exact sequence is in the service documentation; several common variants are printed on owner forums and the tech sheet.
3
E15 (water in base pan): pull the unit, tip it forward about 45°, and drain the pan — then find the leak source (door gasket corners, sump seal, hose clamps).
4
E24/E25: clean the filter, check the impeller cover snap behind the filter, and verify the drain hose/air-gap path.

💡 Good to know: E15 is the definitive Bosch code: the anti-flood float in the base pan keeps the drain pump running and blocks all operation until the pan is dry.

Found a Code? Look It Up

Once diagnostics shows you a stored code, find its meaning and fix guide in the full Bosch dishwasher code list. These are the highest-priority codes on this platform:

E15

Leak protection activated — water detected in base tray

⚠ High Severity

E24

Drain blocked — dishwasher not draining

⚠ High Severity

E25

Drain pump or filter blocked — drain impeller obstructed

⚠ High Severity

E01

Heating element or NTC sensor failure — water not heating

⚠ High Severity

E09

Heating circuit failure — heater not functioning

⚠ High Severity

Frequently Asked Questions

How do I clear E15 on a Bosch dishwasher? +

Pull the unit out and tip it forward ~45° to drain the base pan, dry it thoroughly, and fix the leak source. E15 cannot be bypassed — the float switch blocks operation while the pan is wet.

How do I reset a Bosch dishwasher mid-cycle? +

Hold the Start/Reset button for 3–5 seconds with the door closed enough to engage. The unit drains for about a minute and returns to standby.

How to Reset a Bosch Dishwasher → ← All Bosch Dishwasher Error Codes