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Samsung dishwasher code OC: what it means and what to check

Your Samsung dishwasher stopped mid-cycle, may have water in the bottom, and the display says OC, 0C, or oE. This page explains what that code means, what you can safely check first, and when the fault moves into pump, sensor, or valve testing.

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Straight answer

Samsung dishwasher code OC means the machine is detecting an over-level water condition, so it thinks there is more water in the tub than there should be. The most common cause is restricted draining, usually a clogged filter, kinked drain hose, blocked sink drain, or plugged disposal connection.

Check these first

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

  1. Cancel the cycle and let it drain

    Press Cancel or Drain if your model has it, then wait for the pump to stop. If water is on the floor or keeps rising in the tub, stop testing cycles and shut the dishwasher off at the breaker.

  2. Clean the bottom filter assembly

    Pull out the lower rack, twist out the round filter assembly in the sump, and rinse the fine mesh and coarse filter under hot water. Scrub off grease and food film with a small brush, then check the sump cup for seeds, glass, labels, or bones.

  3. Check the drain hose under the sink

    Look where the dishwasher drain hose connects to the sink drain or disposal. A crushed hose, low sag full of water, or heavy kink can slow the drain enough to trigger OC.

  4. Check the disposal or sink drain

    Run the sink and disposal if you have one. If the sink backs up or drains slowly, the dishwasher has nowhere to send the water. On a newer disposal, a missed dishwasher knockout plug can block the drain port completely.

  5. Reset only after the checks

    After the filter and drain path are clear, turn power off at the breaker for 30 seconds, then try a short cycle. A reset may clear the display, but it won't fix a clogged hose, weak pump, bad sensor, or valve that won't close.

  6. Watch for water entering when it should not

    If water keeps seeping into the tub while the dishwasher is off, close the water supply valve under the sink and leave the power off. That points toward an inlet valve that isn't sealing.

When it's a repair

A technician usually starts with the drain path, then the drain pump, then the case break or overflow sensor, then the water inlet valve. If the pump runs but doesn't move water, the impeller may be jammed or the pump may be weak. If the tub is barely wet yet OC returns, the case break sensor becomes more suspect. If water enters with the machine off, the inlet valve moves up the list. A repair is harder to justify when the dishwasher is near the end of its service life, has tub or base leaks, or needs multiple major electrical parts at once.

Models where this shows up most

Some Samsung models without a digital display show this fault with blinking lights instead of OC, 0C, or oE. Waterwall models can also show related water-level and reflector faults, so the exact display style matters.

Worth knowing

Conditions that make this more likely

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.

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.

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
Drain pumpRun the unit into drain or diagnostic mode and listen at the drain phase. A hum with no water movement, grinding, rattling, or a locked impeller points to a jammed or failing pump; a technician may also check running amp draw against the nameplate, with more than a 10 percent deviation treated as a failed pump.
Drain hose and sink connectionDisconnect the drain hose from the disposal or sink tailpiece and test flow into a bucket during drain, using care to control water. Poor flow with the pump running points to a hose clog, crushed section, blocked air gap if fitted, or a disposal inlet that still has the knockout plug in place.
Filter and sump pathRemove the filter stack and inspect the sump passages down to the pump inlet. Food film on the fine filter, glass in the sump cup, or debris near the impeller can slow drain flow enough for an over-level fault even when the pump motor still runs.
Case break or overflow sensorInspect the case break water path for internal buildup and check the sensor connection for corrosion or moisture. On these machines the sensor is often part of the case break assembly, so a sensor fault may mean replacing the case break rather than swapping a small separate switch.
Water inlet valveWith power removed and the water supply open, check whether water still creeps into the tub. A valve that leaks when de-energized has failed mechanically; if it only overfills while powered, the technician checks whether the control is sending fill voltage longer than it should.

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

Is OC the same as 0C on a Samsung dishwasher?

Yes, Samsung groups OC, 0C, and oE as over-level water errors. They all mean the dishwasher is detecting more water than it should.

Can I keep running cycles to see if it clears?

Don't keep starting full cycles if the tub is holding water. Clear the filter and drain path first, because repeated fills can make an over-level problem worse.

Will unplugging the dishwasher fix Samsung dishwasher code OC?

A power reset can clear a stored display after the real issue is corrected. If the drain is restricted, the pump is weak, or the inlet valve leaks, the code will come back.

Why does OC show when there isn't much water in the tub?

That can happen when the case break or overflow sensor reports the wrong level. A technician will check for moisture, buildup, sensor wiring issues, and a failed case break assembly.

What if I see soap suds with the OC code?

Too many suds can make water-level sensing act strange and can slow draining. Remove excess suds, clean the filter, then run a rinse-only cycle once the tub is under control.

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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