1. Case (door) gasket failure (years 3–6, most common)
What it is: Samsung dishwasher case gaskets stiffen and shrink at the lower corners. A few mL of water tracks down the inside of the door and pools in the basepan during the dry cycle. Two weeks of that and the leak sensor trips LE / LC.
Fix: Replace OEM Samsung case gasket. Dry basepan, clear leak sensor, verify two full normal cycles.
Typical all-in: $225–$315 all-in