Won't drain

For HE errors, before assuming a faulty heater, measure the inlet water supply temperature. If the incoming water is above 185°F (possible in commercial/restaurant settings or after recent water heater adjustment), the dishwasher will trigger HE as an overheat protection. Adjust hot water supply to max 149°F before replacing any parts.

More than 50% of AE error returns are re-leveling issues. After every service call involving moving the machine, re-level using a digital level on top of the tub opening in both directions. Check water level during the first Normal cycle — water should be at the center of both tub lower indentations. A side-to-side tilt of even 0.5° can cause water to pool at one side and trigger the float switch.

For AE (leakage) errors, always tilt the machine toward the front to drain water from the base pan BEFORE resetting and re-running. Water sitting on the float switch will continuously trigger AE. Remove the water, identify the leak source, and repair before cycling power.

LG requires detailed technical remarks for AE errors on repair reports. Always document: whether the unit is level (use a digital level, not a bubble level), detergent and rinse aid brand/type, number of cycles run, most-used cycle, inlet water temperature, and whether the customer opened the door mid-cycle. Missing this information can lead to claim denial.