LC on a Samsung dishwasher means the leak sensor in the base pan tripped. It’s a safety stop, not a wash-cycle glitch. The machine shuts down and won’t restart until the sensor dries out or the real problem gets fixed. Good news: it’s often a false alarm. Here’s how to tell.
What the code is doing
There’s a moisture sensor sitting in the drip tray under the tub. Water reaches it, it trips, and the board kills the cycle and shows LC (or LE, the same fault on other Samsung lines). The drain pump may run nonstop trying to clear it. That’s the machine warning you before a small leak becomes a flood. It’s a feature, even when it’s annoying.
Most likely triggers, in order
A false positive. The most common one I see on calls. A nearby spill, kitchen humidity, or a slight tilt during install puts a little water in the pan with no actual leak. The sensor trips and the machine sits there looking dead when nothing’s wrong.
Too much detergent. Excess foam overflows into the base pan and trips the sensor. Happens more than people think. Use dishwasher detergent only, don’t overfill, and if you recently switched products, look there first.
A worn door seal. Years of heat cycles crack the gasket, and a small gap lets water run down the front and pool in the base. Run a short cycle and watch whether water tracks down the inside of the door.
Loose hose connections. Inlet line, drain hose, and internal circulation hoses all have clamps that vibrate loose over time. A slow drip finds the pan eventually.
Inlet valve or pump seal. A cracked valve or failed seal drips even when the machine’s off. That shows up as water in the pan when nothing’s run recently.
A stuck inlet valve. If it won’t close all the way, the tub overfills. You’d also see long fill times or water on the floor.
Try this first
A breaker reset clears a lot of false-positive LC codes. Two minutes:
- Cancel the cycle and shut the dishwasher off at the panel.
- Kill power at the breaker for at least 15 minutes to reset the board.
- With power off, gently tip the dishwasher forward a couple of inches to drain any base-pan water toward the front. Towels ready.
- Restore power and run a short rinse. Watch the base of the door for drips.
Code clears and stays gone through a full cycle? Almost certainly a false positive. Comes back? There’s still water in the tray or a leak feeding it. That’s where the investigation starts, not ends.
What a tech checks
First move is pulling the kickplate and looking in the base pan with a flashlight. Standing water, and where’s it coming from: a hose, the door seal, the pump area? That narrows it fast. From there: inspect the gasket for cracks, check every clamp and fitting, and run a fill cycle watching the valve. A pump-seal leak usually leaves mineral residue at the failure point. An inlet valve dripping at rest puts water in the pan even when the machine’s been idle. Clear the code without finding the source and it just comes back. The sensor’s doing its job.
Why it’s a proper diagnostic
A breaker reset and a detergent check are fine first steps. Past that, the fix depends entirely on what’s actually leaking. Swap a $30 gasket when the real leak is the inlet valve and the code returns. Valve and pump work sits under water pressure, and a poor repair there is how you get actual subfloor and cabinet damage that costs far more than doing it right.
When to call
If the code came back after the reset, or you saw water on the floor or dripping from the door mid-cycle, call. The longer an active leak runs, the more likely water gets into the subfloor.
Bay Area Appliance Repair Service handles Samsung dishwashers across the Bay Area, from the Tri-Valley through the East Bay. Book a diagnostic through the contact page and we’ll get you on the schedule, often same or next day. We find the source, give you the number after the $75 diagnostic (credited to the repair), and tell you honestly whether the fix makes sense for the machine’s age.