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Dishwasher not draining Samsung: what it means and what to check

You may see standing water in the tub, a 5C or 5E code, an OC or OE overflow code, or flashing lights after the cycle stops. This guide walks through the safe checks first, then shows what a technician tests when the clog isn't under the sink.

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Straight answer

On a Samsung dishwasher, standing water or a 5C, 5E, OC, or OE code means the control can't move water out fast enough or is seeing overflow from poor drainage. The most common cause is a blocked drain path under the sink, especially the disposal inlet, air gap, filter area, or a kinked drain hose.

Check these first

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

  1. Run the sink and disposal

    Run water in the sink that the dishwasher drains into. If the sink drains slowly, the problem is in the home drain, disposal, or trap rather than the dishwasher.

  2. Check for a recent disposal install

    If a disposal was just replaced, the dishwasher drain plug may still be inside the disposal inlet. That one small plug will stop the dishwasher from draining at all, so have the installer or a plumber check it if you aren't sure.

  3. Look at the drain hose under the sink

    The drain hose should have an air gap or a high loop under the counter. Also look for a sharp bend, a crushed section, or the dishwasher sitting on its own hose after installation.

  4. Clean the filter and sump area

    Pull the lower rack and clean the filter parts the way your manual shows. Use care because glass and sharp bits can hide in the drain area, and put every filter piece back in the correct position.

  5. Clean the air gap if you have one

    The air gap is the small cap near the faucet on some sinks. Lift the cover, remove visible debris, and rinse the insert, since food can pack in there and make water back up instead of draining.

  6. Reset only after the checks

    Turn power to the dishwasher off for about 5 minutes, then start a new cycle. A reset can clear an interrupted cycle, but if the water returns or the code comes back, the machine still has a drain fault.

When it's a repair

If the under-sink drain path is clear, a technician usually checks the auxiliary drain pump and impeller first, then the check valve, internal drain hoses, case break, float or water-level parts, and finally the control if the pump is never powered. The common repair is clearing glass, seeds, labels, or plastic from the pump housing, then replacing the drain pump if it hums, grinds, has an open winding, or gets power with no water movement. A damaged drain hose or stuck check valve is next in line. Replacement makes more sense when the dishwasher is an older builder-grade unit near the end of normal dishwasher life, especially if it also has wash, leak, or control issues.

Models where this shows up most

Older Samsung 400, 700, and 800 series dishwashers may have a circulating pump impeller under the filter on the round sump, and debris there can affect draining. Some Samsung models show drain trouble with 5C, 5E, OC, OE, or flashing light combinations, so the exact display can vary by model.

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.

Boards fail earlier in hot rooms

Electronics are rated for room temperature. In a garage or an unconditioned laundry room in summer, a control board can sit well above that for hours a day. Before replacing a board, a good technician confirms the parts it controls test good, since a shorted pump or valve can take out a new board too.

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
External drain path, air gap, and disposal inletA technician disconnects the drain hose at the sink connection and runs a drain test into a bucket. Strong flow points to a clogged disposal inlet, air gap, or house drain, while weak flow sends the diagnosis back toward the dishwasher.
Auxiliary drain pumpSamsung dishwashers use a drain pump separate from the wash motor on many models. During a drain call, a technician checks for 120 VAC at the pump connector, then removes the pump to look for a jammed impeller, broken glass, seeds, plastic, or a pump that hums without moving water.
Drain pump impeller and pump housingWith power off, the pump is unlocked from the sump by its tab and twist mount on many units. The impeller should turn without grinding; a small white plastic shard or food bit in the volute can make the motor hum while no water leaves the tub.
Check valveThe tech checks the ball or flapper style valve in the pump discharge or sump. A stuck ball, twisted flapper, or debris under the valve can cause slow draining, backflow into the tub, and repeat 5E style drain errors.
Case break and internal drain hoseOn models with a side case break, the tech pulls the dishwasher and inspects the looped water passage for debris at the small vent area. The hose from pump to case break is checked for grease, food buildup, and a partly blocked check valve.

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 a Samsung dishwasher that won't drain?

Yes. Turn power off for about 5 minutes, then restore power and start a cycle. If the code or standing water comes back, the reset only cleared the display, not the drain fault.

What do 5C and 5E mean on a Samsung dishwasher?

Both point to a drain problem. The dishwasher is not seeing water leave the tub fast enough, so start with the sink drain, disposal inlet, air gap, drain hose, and filters.

Why did the problem start after a new garbage disposal?

The dishwasher knockout plug inside the disposal inlet may still be in place. That blocks the dishwasher hose connection, so the pump runs but water has nowhere to go.

Is this different on hidden-control and front-control Samsung dishwashers?

The control panel style doesn't change the drain path much. The filter layout, air gap or high loop, pump access, and error display can vary, so use the manual for your exact model when removing filter parts.

When should I call a repair company?

Call if the sink drain, air gap, hose shape, and filter area all check out, or if the pump hums and the tub still holds water. At that point the likely faults are inside the dishwasher, where the drain pump, check valve, case break, and wiring need to be tested.

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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