E15

Bosch dishwasher — Error Code E15

Water has collected in the bottom base tray, activating the AquaStop safety mechanism.

What it means

The E15 error on a Bosch dishwasher serves as a safety alert, signaling that moisture has gathered in the lower base pan—the tray located beneath the washing chamber. These units feature the AquaStop leak detection system, which uses a polystyrene float switch within that tray. If water fills the basin, the float rises and pushes a microswitch. This action triggers the controller to halt the wash cycle, cut off the water inlet valve, and keep the drain pump running to remove standing water. You might notice the pump humming even when the machine is powered off. The E15 code persists until the float switch is no longer held in the 'up' position. Fixing this requires both draining the base pan and identifying the source of the leak.

Likely Causes

1

Sump Basin Seal Failure

Over time, the silicone seal between the stainless steel tub and the plastic sump basin can degrade, letting water leak into the base pan. Bosch offers a specific wire-guided seal kit to address this.
2

Leaking Circulation Pump

The main wash motor, or circulation pump, may develop hairline cracks or worn O-rings, which allows pressurized water to spray into the chassis.
3

Water Inlet Valve Leak

A damaged or cracked water inlet valve may leak during the intake phase. This often manifests as a slow, persistent drip that triggers the E15 warning overnight.
4

Clogged Filter or Oversudsing

Using too much detergent or having a blocked filter can cause excessive suds, leading water to spill over the tub's edge and down into the base pan.
5

Faulty Float Switch

It is uncommon, but the polystyrene float can become stuck due to debris, or the microswitch itself may fail, causing a false leak report to the controller.

How to clear / reset

Because E15 is a mechanical safety lockout, a standard reset won't work. You must remove the water to stop the drain pump. First, flip the circuit breaker to turn off power. Pull the dishwasher away from your cabinetry and gently tilt it backward at a 45-degree angle, using a towel to catch the water as it pours out of the base. Once the base is completely dry, the float will drop. When you restore power, the code should clear. Be aware that if you haven't repaired the actual leak, the E15 code will reappear as soon as the pan fills again.

Common replacement parts

Sump Seal Repair Kit 12005744 $30-60

Circulation Pump & Heater Assembly Varies by model $150-250

Water Inlet Valve Varies by model $40-80

AquaStop Float Switch Varies by model $25-50

When to call a pro

If the E15 error code returns after you have drained the base, you are dealing with an active internal leak. Locating the exact point of failure—whether it's a worn sump seal, a fractured wash motor, or a diverter valve issue—requires taking apart the lower chassis and observing the components under pressure. Replacing a sump seal or circulation pump is a complex task requiring familiarity with Bosch base-removal procedures. A-Fix Service provides a $90 diagnostic fee (which is waived if you proceed with the repair) and includes a 1-year parts and labor warranty on all leak repairs.

FAQs

How much does it cost to fix a Bosch E15 error?

For a failing sump seal, you can expect to pay between $150 and $250 for parts and labor. If the circulation pump assembly requires replacement, the cost typically falls between $300 and $450, depending on your specific model.

Can I fix the E15 code myself?

You can perform a temporary fix by tilting the unit to drain the water. However, internal repairs involving seals or pumps require removing the dishwasher and disconnecting plumbing, which is best handled by a professional.

Will the E15 code clear itself once the water dries?

Yes, the code will clear once the float switch drops, but natural evaporation can take weeks. If the leak is not repaired, the code will simply return during your next wash cycle.

Is it safe to keep using the dishwasher if I keep draining the base?

No. Allowing water to repeatedly leak into the base can damage your wiring harness, control board, or drain pump, turning a simple fix into a major electrical repair.

How long does it take a technician to fix this?

A typical sump seal or inlet valve replacement takes our technicians about 1 to 1.5 hours. Replacing a full circulation pump can take up to 2 hours.

Need help with E15?

Our certified techs diagnose Bosch error codes daily. $90 diagnostic · 1-yr warranty.