Why Does My Samsung Dishwasher Show an LC Code but No Leak?

The floor is dry, but LC is showing

The leak sensor can encounter water beneath the dishwasher before any reaches your kitchen floor. Moisture left after a move, a small leak that appears only during a cycle, or damp detergent residue can all set off LC. The code alone does not identify a failed part.

We'd start with the connections you can see under the sink. On a WaterWall dishwasher, a blocked water reflector is another possibility.

The pump keeps running or the dishwasher keeps beeping

LC can make the dishwasher pump water out while the warning remains, so the sound of draining does not mean it is ready for another load. Have a flashlight and towels ready, and locate the dishwasher's water shutoff valve under the sink. Visible water calls for leaking dishwasher checks.

1. Stop the cycle and disconnect power at the plug or breaker. The beeping and pump should stop once power is off.
2. Look at the floor around the dishwasher and the visible supply and drain connections under the sink. Use the flashlight to spot drips, damp fittings or water running from beneath the machine.
3. If water is escaping, close the dishwasher's water supply valve under the sink. Leave power and water off until the leak is corrected. If the floor and connections are dry, continue with the power-off checks.

Look at the hoses and the new disposal hookup

Keep power off. Wipe the visible water supply hose and both end fittings with a dry cloth. Look for dampness, damage or a loose fitting. A drip while the dishwasher is idle points to this pressurized line.

Follow the drain hose to the sink drain, air gap or disposal. Look for moisture or a slipped clamp. With the water supply closed, tighten a screw clamp with a flathead screwdriver or reposition a squeeze clamp with pliers; wipe the joint dry and watch for a new drip during the test. Replace a split hose. After correcting the connection or replacing the hose, reopen the water valve and look for drips before restoring power for the supervised test.

If LC began after installation or a move, straighten any drain hose pinched where you can reach it. At a new disposal, the installer disconnects the hose to inspect the dishwasher inlet for its knockout cap, removes a retained cap, and reconnects the hose securely before testing. A damaged hose needs replacement before testing. On the later test, water should drain without dripping at the joint.

If the drain hose passes through a cabinet opening, inspect the hose and the opening's edge. With power off, sand a rough wooden edge smooth or cover a sharp metal edge with insulation or duct tape, but only if the hose is intact. The hose should no longer rub there, and the opening should stay dry during the test. A damaged hose needs replacement.

The drain hose also needs an air gap or a high loop to reduce backflow. Look for its rise beneath the sink before it enters the drain; the dishwasher's installation guide gives the route, and local rules decide whether an air gap is required. If the route changed during a move, dishwasher fitting and connection checks show the connection layout.

Find a leak that starts during washing

With power off, feel around the rubber door gasket. Food or detergent residue can hold it away from the door, and a section outside its channel leaves a gap. Clean it with mild soap and a soft cloth, then press displaced rubber back into its channel. The door should close squarely and stay dry during the test. A torn seal needs replacement.

Look into spray-arm holes and nozzles with a flashlight. Use a toothpick to loosen visible food or deposits; a blocked outlet can direct spray toward the door. On a WaterWall dishwasher, move any dish or utensil blocking the reflector and remove reachable packing tape from its rail after installation. Its path should be clear, and the test should leave the door dry.

If you saw foam or detergent outside the dispenser, leave power off until suds dissipate. Use only automatic dishwasher detergent in the dispenser, at the package amount. Hand dish soap or excess detergent can drive suds and water out of the tub, while damp residue near the sensor can keep LC active. No fresh suds or moisture during the test is the result you want.

See whether the door closes squarely

After a move, or if the door rubs a cabinet, place a level across the top front of the dishwasher and then front to back. A forward tilt can bring wash water toward the door. With power off, turn the leveling legs with a wrench or hex tool until the bubble centers both ways. The door should move freely and stay dry during the test.

Look along the closed door opening. A bowed opening can keep a sound gasket from sealing. Cabinet screws visibly pulling the tub sides out of shape need installation correction; loosening structural screws without the mounting instructions can leave the dishwasher unsecured.

If a black lower flap hangs below the door, disconnect power before removing the kickplate. Tuck the flap behind it and refit the fasteners; it should stay there as the door moves. Note a distorted opening, loose flap or unreachable leveling hardware when arranging the repair.

Let it dry, then make one supervised test

After a move or one-time spill with no active leak, leave the dishwasher unplugged or off at the breaker while moisture dries. Drying has no fixed reset time. A power cycle can clear a stored warning only after the cause is gone; it cannot repair a leak.

1. Restore power and watch the display before starting a cycle. If LC appears immediately, turn power off again; new spraying or draining has not caused this warning.
2. If LC stays off, run one short cycle while watching the floor, door edge, and accessible supply and drain connections. Note whether the warning returns while filling, washing or draining.
3. Stop the test if LC returns or new water appears. Close the water valve if water is escaping. A cycle that finishes without LC or new moisture is the practical sign that the correction worked.

What a returning LC code points to

An immediate return after drying points to moisture near the sensor or a sensing fault. Trace the source before replacing the sensor.

LC during filling points you back to the supply line and fittings. During washing, inspect the door edge, spray outlets, level and suds. During draining, inspect the drain clamp and disposal joint. Timing narrows the search without identifying a failed pump.

On a WaterWall model, clear a blocked reflector with power off, even when the visible areas are dry. If LC returns with the path clear, concealed moisture, an intermittent internal leak or a sensing fault needs source tracing. Record the cycle phase and location of any fresh moisture. Samsung's LC troubleshooting (opens in a new tab) covers this reflector check.

What to do when the owner checks run out

If LC returns immediately or during the supervised test, or water comes from beneath the machine while visible hoses stay dry, leave power off and close the water valve if water is escaping. Contact Samsung support or an authorized Samsung service center for appliance diagnosis. For a recent hookup error, contact the installer; for a home drain or shutoff fault, contact a plumber.

Give them the model, serial number and purchase date. Report when LC appeared, whether the pump ran, where moisture appeared, any recent move or disposal hookup, the detergent used and the result of your one test. Have the leak source confirmed before authorizing sensor or pump replacement.

Example: A genuine Samsung door gasket at $94 to $110 plus 1 billed hour at $75 to $125 per hour builds the $170 to $240 repair.

A gasket repair combines one part with one billed hour at $75 to $125 per hour, for a typical total of about $200 using a $100 gasket and one hour at $100 per hour. Shops mark parts up over retail, so an itemized quote's parts line can run higher. Compare a high internal-repair quote with installed replacement cost, the machine's age and repair history.

Most Samsung home appliances have a one-year parts-and-labor warranty. Longer coverage on some dishwashers applies only to named components and may cover parts without labor; LC alone establishes neither the failed part nor coverage. Samsung's dishwasher warranty terms (opens in a new tab) show how that limited component coverage is written. Give support your purchase date and model before approving an out-of-warranty repair.

Common questions after an LC warning

Load dishes so they do not press against the door seal or block a WaterWall reflector. After moving the dishwasher or changing its disposal hookup, watch the under-sink joints during its first supervised cycle.