LG Dishwasher Error Code IE3 — Water Level Sensor Error

What Does This Error Mean?

The IE3 error means there's a problem with how your LG dishwasher measures the water level inside the tub. The dishwasher uses a sensor to know when enough water has entered — and when it should stop filling. IE3 means that sensor is either giving unexpected readings or isn't responding at all. This can cause the dishwasher to overfill, underfill, or stop a cycle prematurely. A power reset often clears temporary sensor glitches.

Affected Models

LDF5545ST
LDT5678SS
LDFN4542S
LDP6810SS
LG dishwashers with pressure-based water level sensing

Common Causes

Water level pressure sensor has failed or is giving readings outside acceptable range
Air trap tube connected to the pressure sensor is blocked with debris or detergent buildup
Overfilling from a stuck-open water inlet valve caused the sensor to hit its upper limit
Wiring connection to the water level sensor has come loose
Control board has stopped communicating with the sensor

How to Fix It

Unplug the dishwasher for 10 minutes. This allows the sensor and control board to fully reset. Plug back in and run a short cycle. About 25% of IE3 errors are temporary sensor glitches that a power reset fully resolves.

If the dishwasher has standing water in the tub from an aborted cycle, press Cancel/Drain first to empty the tub before attempting a reset.
After the reset, check if the dishwasher is filling to a normal level. The water should cover the heating element at the bottom of the tub but should be well below the door seal. If it's overfilling, a stuck inlet valve may be the root cause — not the sensor itself.

Overfilling can damage the water level sensor. If overfilling is happening, turn off the water supply valve under the sink immediately.
Check the air trap tube — a small rubber or plastic tube that connects the bottom of the tub to the pressure sensor. This tube allows the sensor to measure water pressure (and thus depth). If the tube is kinked, clogged with hardened detergent, or disconnected, the sensor can't work properly.

The air trap tube is usually visible near the bottom of the tub after removing the lower spray arm. Blow through it gently to check for blockages.
Inspect the water level sensor connector. The sensor is typically in the sump area at the bottom of the dishwasher. You may need to remove the lower spray arm and filter to see it. Check that the wiring connector is seated firmly and free of corrosion.

A loose connector is a common and easy fix — much cheaper than a new sensor.
If the sensor connector and air tube are fine but IE3 persists, the sensor itself has failed. Replace it with an LG-specific part for your model. After replacement, run a test cycle and confirm the dishwasher fills to the correct level and doesn't overfill.

After sensor replacement, if the dishwasher still overfills, the inlet valve is the additional culprit and should be replaced at the same time.

When to Call a Professional

Water level sensor replacement requires removing the outer panels of the dishwasher. The sensor is typically located in the sump area at the bottom of the machine. A replacement sensor costs $25-$60. A technician charges $130-$250 for the complete repair.

Frequently Asked Questions

What's the difference between IE, IE2, and IE3 on LG dishwashers?

IE indicates the dishwasher didn't receive water at all (fill failure). IE2 relates to a secondary water inlet issue. IE3 is specifically about the water level measurement system — the dishwasher got water, but the sensor can't verify the correct amount. The fixes are different for each.

Can hard water cause IE3?

Yes — in hard water areas, mineral deposits can build up inside the air trap tube and reduce its ability to conduct air pressure to the sensor. This gives the sensor incorrect readings. Regular dishwasher cleaning with a descaling product (like white vinegar or a commercial descaler) helps prevent this buildup.

Is IE3 dangerous? Could the dishwasher overflow?

There is a small risk of overfilling if the sensor fails in a specific way. However, LG dishwashers also have a physical float switch as a backup overflow protection. If the sensor fails and the float triggers, you'd get an AE or FE error stopping the fill. Don't leave the dishwasher running unattended with an active IE3 until it's repaired.