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
2. Drain-hose split at the disposal tailpiece
What it is: The corrugated drain hose stress-cracks at the tightest bend behind the disposal. Tiny drain-phase weep over weeks fills the leak pan. Common when the dishwasher has been pulled and re-seated during a remodel.
Fix: Replace OEM Samsung drain hose with a clean routing path, dry basepan, reset sensor.
Typical all-in: $215–$305 all-in
3. Sump-to-tub gasket weep
What it is: Lower sump O-ring shrinks at the 5–7 year mark. Slow seep every cycle directly into the basepan, no visible leak above the floor.
Fix: Pull the dishwasher, replace OEM sump gasket and (when warped) the lower spray manifold seal.
Typical all-in: $315–$425 all-in
4. Inlet-valve diaphragm weep
What it is: Samsung inlet solenoid valve diaphragms fail closed-but-leaking — drips during the off-cycle run down the line and pool under the unit. Often paired with a slight whistle on fill.
Fix: Replace OEM Samsung inlet valve, dry basepan, reset sensor.
Typical all-in: $235–$345 all-in
5. Cracked tub (less common, 10+ yr units)
What it is: Hairline stress crack on the polypropylene tub corner. Continuous slow leak that returns within a week of every reset.
Fix: Quote replacement honestly — tub replacement on Samsung dishwashers is rarely cost-effective.
Typical all-in: Replacement quote