The IE error means inlet error — the dishwasher didn't reach the required water level during the fill phase.
The LG dishwasher displays the IE error and halts the current cycle until the underlying problem is fixed.
Check these in order. The first cause accounts for the majority of IE errors.
The shutoff valve under the sink is the most overlooked cause. Even a quarter-turn from fully open reduces flow rate enough to trigger IE on sensitive models.
The braided inlet hose can kink behind the dishwasher if it's pushed too far back during installation. A kink reduces flow to a trickle.
A small mesh screen inside the water inlet valve traps sediment and mineral deposits over time. In hard-water areas this can block the valve significantly.
If supply, hose, and screen checks pass, the solenoid inside the valve may have failed mechanically. A failed solenoid won't open fully regardless of voltage, restricting flow.
Follow these in order. Stop as soon as the error clears.
Shut the valve under the sink, then unplug the dishwasher.
Locate the dishwasher shutoff valve under the sink. Turn it counterclockwise until it stops — fully open. Many valves look open at a glance but are actually a few turns from fully open.
Pull the dishwasher forward slightly to check the hose running from the valve to the machine. Straighten any kinks. The hose should curve gently, not fold back on itself.
Disconnect the inlet hose at the dishwasher's back. Inside the valve's inlet port, there's a small mesh screen. Remove it carefully with needle-nose pliers, rinse under water, and reinstall.
Reconnect everything, restore power and water supply, and run a short cycle. If IE returns with clear supply and a clean screen, replace the water inlet valve.
For warranty service, contact LG support ↗ or a certified appliance technician.