Direct answer: If a Samsung dishwasher is not draining, the most common cause is a blockage in the filter sump, drain hose, or sink-side drain path, not a bad part.
Most likely: Start with the standing water level, clean the dishwasher filter area, then check for a kinked dishwasher drain hose or a clogged air gap or sink connection.
A little clean water in the sump can be normal. A tub full of dirty water, a sour smell, or water that comes back after a cycle points to a real drain problem. Reality check: most no-drain calls end up being food sludge, glass chips, or a sink-side blockage. Common wrong move: running cycle after cycle with standing water and hoping it clears itself.
Don’t start with: Don't start by ordering a dishwasher drain pump just because there's water in the bottom. A plugged drain path is far more common.
A shallow puddle sits under the filter but dishes are otherwise clean and the tub is not filling up.
Start here: This can be normal on some dishwashers. Confirm the water is not rising above the filter area before chasing a repair.
The cycle ends with cloudy or greasy water covering the bottom of the tub.
Start here: Go straight to the filter, sump, and drain path checks. That pattern usually means a blockage, not a control issue.
The dishwasher makes a drain sound or humming noise, but the water level barely drops.
Start here: Check for debris in the sump and a restriction in the dishwasher drain hose or sink-side connection.
The tub looks empty at first, then dirty water reappears after using the sink.
Start here: Focus on the sink drain, air gap if present, or the hose connection under the sink. That is usually backflow, not a failed dishwasher part.
Food paste, labels, broken glass, and grease collect around the filter and the small sump opening. That is the most common reason water stays in the tub.
Quick check: Remove the lower rack and filter pieces. Look for sludge, seeds, bones, glass, or standing water that will not pass through the sump opening.
A kink, grease plug, or low loop problem slows or stops draining even when the pump runs.
Quick check: Inspect the full visible hose path from the dishwasher to the sink drain or air gap. Look for sharp bends, sagging, or a hose packed with debris.
If the sink branch or air gap is plugged, the dishwasher cannot push water out and may back up into the tub.
Quick check: Run the kitchen sink. If it drains slowly, gurgles, or the air gap spits water, the blockage is likely outside the dishwasher tub.
If the drain path is clear but the pump only hums, clicks, or never moves water, the pump may be jammed with debris or worn out.
Quick check: After clearing the filter and hose path, run a drain cycle. If the pump gets power and makes noise but water does not move, the pump becomes more likely.
Some water under the filter is normal. You want to separate a normal sump puddle from a tub that is actually failing to drain.
Next move: If the water level drops to just a small sump puddle and stays there, you may not have a repair problem. If dirty water remains across the bottom or rises back after the sink is used, keep going.
What to conclude: High dirty water points to a blockage or drain failure. Water that returns later points more toward the sink-side drain path than the dishwasher itself.
This is the highest-payoff check. Most dishwashers that will not drain are plugged right at the filter area.
Next move: If the next drain cycle pulls the water out normally, the blockage was in the filter sump area. If the filter area is clean and the dishwasher still leaves water, the restriction is likely farther down the drain path or at the pump.
What to conclude: A dirty filter and packed sump are the most common no-drain cause. A clean sump with no improvement shifts suspicion to the hose, sink connection, or pump.
A dishwasher can sound like it is draining and still move almost no water if the hose is kinked, sagging, or plugged with grease.
Next move: If clearing the hose or sink-side port restores strong draining, the dishwasher itself is usually fine. If the hose path is open and the sink connection is clear, move on to the air gap or pump check.
When dirty water comes back after the cycle, the dishwasher is often being overwhelmed by a clogged sink drain path rather than failing to drain on its own.
Next move: If cleaning the air gap or clearing the sink-side restriction stops the backup, the dishwasher drain system was not the main failure. If the sink drains normally and no air gap blockage is present, the remaining likely cause is inside the dishwasher drain system.
Once the filter, hose, and sink-side path are ruled out, the sound and behavior during drain tell you whether to repair the dishwasher or call for service.
A good result: If a clear pump sound now removes the water, reassemble everything and monitor the next few cycles for repeat blockage.
If not: If the drain path is clear and the pump still hums or grinds without moving water, replace the dishwasher drain pump. If the unit stays silent during drain, schedule service rather than guessing at electrical parts.
What to conclude: A noisy pump with a clear drain path points to a bad pump. A silent no-drain condition is less certain and should not turn into guess-and-buy parts.
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A small amount of water down in the sump under the filter can be normal. If water is spread across the tub floor or smells dirty, that is a real drain problem.
Yes. A slow sink drain, clogged air gap, or blocked sink-side hose connection can stop the dishwasher from emptying or let dirty water flow back into it later.
Suspect the dishwasher drain pump only after the filter, sump, hose, and sink connection are clear. A pump that hums, grinds, or clicks without moving water is more likely bad than a pump that drains strongly.
Skip drain cleaner. It can damage parts and create a mess when you open the machine. Warm water, mild soap, and manual debris removal are the safer first moves for the filter area. Vinegar is not a cure for a solid blockage.
That usually points to backflow from the sink-side drain path, not a failed dishwasher part. Check the air gap if you have one, the high loop in the dishwasher drain hose, and the sink drain for a restriction.