LG Dishwasher Error Codes: What Each Letter Means

Quick Answer: Read the Letter#

Most likely, the two-letter code on your LG dishwasher tells you exactly which system failed, because LG uses specific letter codes instead of the generic flashing patterns other brands rely on. AE means a leak, OE a drain failure, IE a fill problem, HE a heating fault, and LE a jammed or locked motor. LG's Inverter Direct Drive motor and dedicated drain pump give each fault a clean signature, so the code points you straight at the part — a drain error, for example, is the separate drain pump on an LG, not the wash motor reversing as it would on a belt-driven competitor.

Cause-by-Code Table#

The Codes That Trace to Debris#

Three of the most common codes come back to the filter and pump. AE, OE, and LE all trigger when broken EasyRack Plus tine clips or food debris migrate past the filter and reach the pump impeller — a blocked impeller reads as a drain failure or a locked rotor, and seepage from a strained seal reads as a leak. Pull the filter straight up (LG filters lift without a twist), reach into the sump, and spin the drain-pump impeller: it should rotate freely, and any grinding or resistance means debris or a bearing on the way out. Clearing the filter is the first move on every one of those three codes.

The Fill and Heat Codes#

IE and FE are the two water-level faults, and they are opposites. IE means too little water arrived in time, so start at the inlet valve's mesh screen and confirm the household supply delivers at least 20 PSI at the disconnected hose. FE means too much water is present with the valve commanded off, which is either a valve stuck open on mineral deposits or a pressure-switch air trap clogged with detergent residue — the stuck-open valve is more common in hard-water homes. HE, meanwhile, is a heating shortfall: inspect the tub-floor element for blistering and measure it at about 12 to 15 ohms, then check the thermistor separately, since LG's Dynamic Dry system does not use the element for drying and a partial element can still pass a normal wash but fail sanitize.

Reading the History and Clearing the Code#

LG's Smart Diagnosis through the ThinQ app adds context the code alone cannot — when the fault first appeared, how often, and the sensor values at the moment of failure, which is what separates a mechanical jam from an electrical fault on the LE and CE codes. After you fix the root cause, disconnect the dishwasher at the breaker for five minutes, because LG control boards hold charge longer than most. Some codes, LE and CE especially, only clear fully after a complete diagnostic cycle: enter diagnostic mode by pressing Rinse and Spray together for three seconds and let the test sequence finish. If the code returns immediately, the root cause is still there.

Preventing the Common Codes#

Most of these codes are preventable with routine care, since debris and surges cause the majority. Clean the filter monthly by lifting it straight up and clearing the sump, which keeps broken rack clips and food off the pump impeller and heads off the LE and OE codes. Check the inlet valve's mesh screen once a year for mineral buildup to prevent IE, and fit a surge protector on the dishwasher circuit to spare the control board from CE and the random codes that surges trigger. Running LG's Smart Diagnosis through ThinQ periodically catches a degrading sensor's readings before they cross the threshold and actually set a code, turning a surprise breakdown into planned maintenance.

Repair or Replace?#

A single code almost never means the whole dishwasher is finished — under about 8 to 10 years, replacing one valve, pump, element, or sensor costs far less than a new unit. Keep it healthy with monthly filter cleaning to prevent LE and OE, an annual inlet-screen check to prevent IE, and a surge protector on the circuit to spare the board from CE and random triggers. When the code points to the Direct Drive motor or the control board, book an LG dishwasher repair to confirm the part before ordering.