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Samsung dishwasher leak sensor: what it means and how to fix a leak

A Samsung dishwasher can leak onto the floor, or it can stop with an LC, LE, or blinking-light leak alert even when you don’t see water. This page helps you check the safe things first, then shows what a technician tests when water has reached the leak sensor in the base pan.

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Straight answer

The Samsung dishwasher leak sensor is a foam float and micro switch in the base pan; when water or wet detergent reaches it, the dishwasher may show LC, LE, or blinking lights and may keep the drain pump running. The most common cause is a real small leak into the base, often from a loose supply or drain connection after install.

Check these first

Safe to do yourself. Unplug the appliance before you start.

  1. Cut power if water is present

    If you see active leaking or the dishwasher shows a leak alert, turn it off at the breaker. Don’t keep starting cycles to “see what happens” once water is under the unit.

  2. Wipe it dry and confirm it is a leak

    Dry the floor and the toe area, then watch the next cycle only if there is no active leak. If water does not come back, it may have been a spill.

  3. Check the hose connections you can see

    Look under the sink and at the visible water supply and drain connections for dampness, gaps, or a loose clamp. If a new garbage disposal was just installed, make sure its dishwasher drain plug was removed because that can send water where it should not go.

  4. Clean and reseat the door seal

    Open the door and wipe the rubber seal with mild soap and a towel. Push any loose section back into its channel, since a small crumb or folded seal can make a gap at the front.

  5. Look for suds, then check the detergent label

    Foam at the door usually means dish soap or too much detergent got into the dishwasher. Use only detergent labeled for dishwashers, and put it in the dispenser only.

  6. Check level, spray, and side screw tension

    If the front is lower than the back, water can pool at the door and leak out. Also check for clogged spray jets, dishes blocking a Waterwall reflector, or side mounting screws that have stretched the tub opening wider than 22 inches at the screw line.

When it's a repair

A technician will usually look for the leak source before replacing the sensor: hose connections, door gasket or lower corner baffles, spray arms, inlet valve, float switch, vent assembly, then pump, sump, diverter, or case-break seals. The leak sensor micro switch and foam float get replaced when the base is dry but the switch still reads wrong, or when the foam is damaged. An older entry-level dishwasher is often not worth a major sump, pump motor, tub, or multiple-seal repair, especially if the tub is warped or cracked.

Worth knowing

Conditions that make this more likely

Inlet screens clog quietly

The small mesh screens where the hoses meet the machine catch sediment and scale. On hard water or an older supply line, a screen can block enough within a few years to trigger a fill error. Cleaning them is a common fix.

The house drain can be the real problem

Older homes often have narrow or partly blocked standpipes and drain lines. If the machine's own filter and hose are clear, the house drain is the next suspect, and that's a plumbing call rather than an appliance call.

What a technician tests

Most likely part first. These are for a technician with a meter and the tech sheet, not a weekend project.

PartHow it's tested
Supply hose and drain hoseA technician dries the area, runs fill and drain portions of a cycle, then checks each hose end for beads of water, mineral trails, or wet insulation. On a recent disposal install, the dishwasher drain port is checked for an unremoved plug.
Door gasket, spray arms, and tub openingThe gasket and lower corner baffles are checked for cuts, folded rubber, dirt, or sections out of the channel. Spray arms are spun by hand and inspected for clogged jets or cracks, since a bad spray pattern can hit the lower door area where there is no full gasket; the tub opening should be 22 inches at the side screw line.
Leak sensor micro switch and foam floatWith power off and the unit pulled for service, the base cover is removed and checked for standing water, a swollen foam float, or debris holding the float up. On continuity, the micro switch should beep when not pressed and should not beep when pressed; the opposite reading points to a bad switch.
Water inlet valve and float switchThe inlet valve body and outlet side are checked for cracks, drips during fill, and residue trails from a small leak. The float switch is tested on Rx1: it should read zero or infinity, then change to the opposite reading when the button is pressed.
Pump, sump, and diverter sealsThe underside is inspected during a wash cycle for water from the pump motor housing, sump gasket, or diverter O-ring area. For pump electrical checks, a good pump winding reads exactly or nearly zero across the terminals, with no reading from a terminal to the bare metal housing.

Don't see your symptom?

Describe it on the phone. The company on the other end works on these every day and will know what to ask.

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Common questions about appliance repair

Can I reset the Samsung dishwasher leak sensor?

You can turn power off at the breaker, let the base dry, then restore power. If water or wet detergent is still in the base pan, the code will come back.

Why is there an LC or LE code with no puddle?

The sensor sits in the base under the dishwasher, so it can trip before water reaches the floor. Wet detergent, water splashed during a move, or a small internal leak can all reach that pan.

Can I run the dishwasher while it is leaking?

No. Turn it off at the breaker if you see water or get a leak alert, because water under the machine can damage flooring and electrical parts.

Is a new Samsung dishwasher leak usually a bad dishwasher?

Many new-install leaks trace back to setup, such as loose hose connections, an unremoved disposal plug, leveling, or side screws pulling the tub out of shape. Check those items before assuming the machine itself has failed.

When does the leak sensor itself need replacement?

If the base is dry and the foam float is sitting down, a technician tests the micro switch. A switch that stays open or closed at the wrong time, or a damaged foam float, calls for sensor replacement.

Still showing the problem after the checks?

Call and describe what you tried. You'll be connected with an independent repair company near you.

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