Dishwasher displays E4; may indicate overfill or leak condition with water in the base.

Safety: Immediately turn off power at the breaker and shut off the water supply to prevent flooding.

Steps:

• 1. Remove excess water: Open the door and bail out water from the tub if overfilled. Remove the toe-kick and check the base pan for water; dry it completely.
• 2. Inspect float and switch: Locate the float inside the tub (if equipped). Ensure it moves freely up and down. Check the float switch in the base for proper operation and no obstructions.
• 3. Check inlet valve: With water supply off, disconnect the hose at the valve and inspect for leaks. If water continues to flow into the dishwasher when power is off but water is on, the valve is stuck open and must be replaced.
• 4. Inspect for leaks: Examine hoses, sump, and pump seals for drips or mineral trails. Tighten clamps and replace damaged components.

After correcting leaks and replacing a stuck inlet valve or faulty float switch, restore power and test. If E4 returns without visible leaks, the control board may be misreading the level and should be checked by a technician.