Bosch Dishwasher E15 Error Code: Causes and Fixes

The E15 error on your Bosch dishwasher means water has collected in the base tray under the machine and the AquaStop leak sensor has tripped. The dishwasher won’t run again until the tray is dry and the source of the leak is found.

What the E15 error means

Bosch dishwashers have a leak-protection system called AquaStop. A small polystyrene float sits in the base tray under the machine. If water collects in that tray — from a leak anywhere inside the dishwasher — the float lifts and trips a safety switch, cutting power to the wash cycle. E15 displays and stays displayed until the water is removed and the float drops back. Clearing the code without finding the leak source means it’ll return on the next cycle.

Common causes

• Worn or damaged door seal letting water escape during a cycle
• Failing water inlet valve dripping into the base
• Cracked or loose internal hose connections
• Excess detergent producing foam that overflows into the tray
• Control board fault triggering the sensor falsely (less common)

How to fix the E15 error

1. Try a hard reset first. Disconnect the dishwasher from power for five minutes, then plug it back in. If the float was tripped by a one-off splash, the code may clear without further work.
2. Drain the base tray by tilting. If you have space, tilt the dishwasher backwards to roughly 45° for a minute or two so trapped water runs out the bottom. Have towels ready under the rear of the machine.
3. Or remove the kickplate and dry the tray manually. Disconnect power and the water supply. Use a T15 or T20 Torx bit (Phillips on some models) to remove the front bottom kickplate. Find the polystyrene float in the center of the base tray, mop up any water with a towel, and dry the float thoroughly before refitting.
4. Find the leak source. With the kickplate off, inspect the door seal, the water inlet valve, and the internal hose connections for drips, splits, or wet patches. Replace any worn or damaged parts with Bosch-approved spares before the next cycle.
5. Cut detergent dosage if foam was the cause. Excess detergent — especially in soft-water areas — produces foam that escapes into the base. Halve your dose and use a Bosch-recommended detergent if E15 returns after foamy cycles.
6. If E15 returns after all of the above, the inlet valve, the leak sensor, or the control board has likely failed and the job is past quick DIY. Call a qualified technician.

FAQ

Can I run the dishwasher with E15 showing?
No — the safety switch keeps power cut to protect against further leakage. You have to clear the water from the base tray before the cycle will start again.

Will tipping the dishwasher really clear E15?
Yes, in many cases. Tilting the machine back to about 45° drains the base tray and lets the float drop. If the underlying leak is fixed, the code clears on power-up. If it isn’t, it’ll come back.

Is E15 covered by Bosch’s leak warranty?
Bosch’s AquaStop comes with a lifetime guarantee against water damage caused by AquaStop failure on most current models — but only if the failure is in the AquaStop system itself, not a worn door seal or hose. Check your model’s warranty terms before claiming.