LG Dishwasher Error Code E4

E4 on an LG dishwasher means the overflow safety switch has been detected in the ON position for 2 or more seconds during power-on. A floater in the base pan has risen and pressed a micro switch, signaling that water has accumulated in the drip tray beneath the unit. This error has priority over all other error codes and will prevent the dishwasher from operating until the condition is resolved.

No, you should not attempt to run the dishwasher while E4 is active. The error indicates a potential water leak, and continued operation could result in additional water damage to cabinetry, flooring, or electrical components. The dishwasher is designed to halt operation when this code is triggered specifically to prevent that scenario.

A simple power reset will not permanently clear the E4 error if the underlying cause is still present. Because the overflow switch is detected as active at power-on, the error will return as soon as the appliance is powered again. The error will only stay cleared after the root cause, whether it is a wiring fault, stuck float, or actual water leak, has been properly diagnosed and repaired.

Start by checking the wiring connector at the leakage switch for loose or corroded terminals and reseat it if necessary. Next, remove the lower access panel and look for standing water in the base pan, then trace any leak back to its source, such as a hose, pump seal, or door gasket. If the base pan is dry and the connector is intact, test the float and micro switch assembly for mechanical faults or debris that may be keeping it activated. Once the underlying cause is repaired and the base pan is dry, the error should clear on its own.

Repair costs vary depending on the cause. If the issue is simply a loose connector or a stuck float with no actual leak, the repair may cost little to nothing beyond your time. Replacing a door gasket typically runs in the range of $20 to $60 for the part. More involved repairs such as a pump seal replacement or inlet valve swap can range from $80 to $200 or more, especially if a technician is involved.