Bosch E15 Dishwasher Error — Water Reservoir and Pressure Switch

Bosch dishwasher E15 is the panic code. The unit beeps, the display shows E15, and you cannot start a cycle. E15 means the base-pan leak sensor has detected water: the Aqua-Stop has tripped and the inlet valve is locked closed. The unit will not run again until the water in the pan is gone and the sensor is reset. Here is how to find where the water came from and how to clear the code.

What E15 actually triggers

Every Bosch dishwasher has a polystyrene float in the base pan beneath the tub. When water reaches the float, it rises and trips a microswitch. The control reads “leak detected”, closes the Aqua-Stop solenoid, and displays E15.

Step 1: clear the base pan water

1. Pull the dishwasher forward from the cabinet (you may need to disconnect the drain hose and supply line: turn off the water supply first)
2. Tilt the unit forward to drain water from the base pan into a towel
3. Or pull the kick plate, reach in with a sponge, soak up water
4. If you cannot pull the unit, the only option is to tilt the front feet up; raise the front feet to slope water toward the back, or vice versa

Step 2: reset the float

• Once water is removed, the float drops, the switch reopens, the code clears
• Cycle power: turn off at the breaker for 60 seconds, restore
• The E15 display should clear. If not, water is still in the pan or the switch is stuck

Step 3: find the leak source

This is the actual problem. The code is just the symptom. Look for these leak sources in order:

3a. Inlet hose connection

The Bosch Aqua-Stop hose connects to the supply at the angle stop. Over time, the hex nut backs off or the washer fails.

• Inspect the connection under the sink: any moisture, mineral deposit ring, or drip
• Tighten by hand plus quarter turn. Do not overtighten; cracks the plastic ferrule
• Replace the rubber washer if cracked

3b. Drain hose

• The drain hose runs from the back of the unit up to a high loop, then to the disposer or air gap
• Common failure: drain hose kinked behind the unit, water backs up and overflows
• Or: clamp at the back of the dishwasher loosened, hose disconnected partially

3c. Door seal / tub gasket

• Run an inspection cycle. Watch the door for water seeping at the bottom corners
• Common in 5+ year old units: gasket compressed permanently or hardened
• New gasket $30-60, install 30 minutes

3d. Pump seal failure

• Internal pump seal leaks water into the base over time
• Repair requires pump assembly replacement: $130-180 part, 2 hours labor
• This is what we see most often on 8+ year-old Bosch 500/800 series

3e. Spray arm bearing leak

• The lower spray arm has a small bearing/seal in its mount
• If worn, water under pressure leaks from the arm mount into the tub bottom, but if it sprays sideways it can find its way into the base
• Lower spray arm replacement $40-70, easy install

The diagnostic shortcut

If you cleared E15, ran a cycle, and got E15 again within one cycle, the leak source is active: do not keep cycling water through. Pull the unit, identify the leak before continuing.

If you cleared E15 and it took a week to come back, the leak is slow. A weeping hose, gasket or seal is more likely than a hard failure. Still needs fixing, but less urgent.

When the float is stuck

If the base pan is dry and E15 still displays after a 60-second power cycle, the float itself is stuck up. Pull the kick plate, reach in (gloves), find the float (white polystyrene cylinder, near the front center of the base), wiggle it free. Stuck floats are usually from a prior leak event where soap residue gummed up the float guide.

Bosch E15 is not a covered warranty event

Bosch warranty does not cover leaks from connection issues, gasket wear, or pump seal failure beyond the standard 1-year period. If your unit is past warranty and you have had multiple E15 events, replacement may be the better economic call: repeated leak repairs add up.

Related: Bosch repair | Dishwasher services | Service in Aventura