A Samsung dishwasher that isn't cleaning usually comes down to a clogged sump/filter, a spray arm that isn't spinning, or a fill/drain problem so the tub doesn't hold enough clean water. Samsung dishwashers also throw clear error codes — an OE, 5C, or LC on the panel points you straight at the cause.
The known Samsung issue: Samsung dishwashers are prone to sump and drain clogs, and a machine that doesn't drain fully will "wash" the next load in leftover dirty water — the top complaint behind "it stopped cleaning." Clean the filter and clear the drain path first; an OE or 5C code confirms it.
What's actually different about a Samsung
Clogged filter and sump Easy
The bottom filter and sump pack with food so dirty water recirculates onto the dishes.
What you can check: Twist out the filter under the lower spray arm, rinse it and the sump, and clear any debris. Run monthly.
Spray arm not spinning / clogged Easy
Scale and food block the jets or wedge the arm so upper dishes stay dirty.
What you can check: Pull the spray arms, clear each jet, confirm they spin freely, and reseat firmly.
Drain problem leaving dirty water (OE/5C) Moderate
If the dishwasher can't drain fully, it washes the next cycle in dirty water. An OE or 5C code means a clogged filter, drain hose, or drain pump.
What you can check: Clean the filter, check the drain hose for kinks, and make sure the sink air gap / disposal knockout is clear.
Water not heating / weak fill Pro
A failed heater or a weak water-supply fill (4C) means cold or too-little water — poor cleaning.
What you can check: Confirm the hot supply valve is fully open and the inlet screen is clear; a cold end-of-cycle tub points to the heater (a tech job).
Samsung dishwasher fault codes
OE / 5C
Drainage error — clogged filter, hose, or drain pump (washes in dirty water)
4C
Water supply error — closed valve, kinked line, or clogged inlet screen
LC / LE
Leak detected — leak sensor tripped
tC
Temperature sensor fault (heating/cleaning affected)
Try this first: Reset by holding the cycle buttons your model uses (often two adjacent buttons for ~3 seconds) or by cutting power at the breaker for a minute to clear the control.
Get the exact Samsung part — shipped to your door
With the $50 Quick Check, send a short video and a photo of your Samsung dishwasher's model number. A real technician confirms the diagnosis and we ship you the exact part with instructions — the $50 is credited toward it. Or we walk you through the fix free.
A dishwasher that runs a full cycle but leaves food, film, or grit behind is rarely broken — most of the time it's starved of one of the three things it needs to clean: a clear filter, freely spinning spray arms, and hot water. Most of these you can fix yourself in a few minutes. Here's the order a tech checks them.
Safety first: These checks are low-risk, but pull the door open mid-cycle carefully — the water inside is very hot.
Clogged filter Easy
Most modern dishwashers have a removable filter in the bottom that traps food. When it packs with gunk, dirty water just recirculates onto your dishes. This is the single most common cause of poor cleaning.
What you can check: Twist out the cylindrical filter in the floor of the tub, rinse it under the tap, and scrub it with a soft brush. Do this monthly and cleaning improves dramatically.
Blocked spray arms Easy
The spray arms have small jets that can clog with hard-water scale, seeds, and debris. If a jet is blocked or an arm can't spin freely, whole sections of the rack never get sprayed.
What you can check: Pop off the spray arms (usually a twist or clip), poke each jet clear with a toothpick, and make sure they spin freely by hand. Also check that tall items aren't blocking them.
Water isn't hot enough Easy
Dishwashers need about 120°F water to dissolve detergent and cut grease. If the incoming water is cold — a common winter problem — detergent won't activate and dishes come out filmy.
What you can check: Run the kitchen sink hot for a few seconds before starting the dishwasher so hot water reaches it right away, and use the "heated" or "sanitize" option.
Hard-water buildup / no rinse aid Easy
Mineral scale coats the tub, jets, and heating element over time, and skipping rinse aid leaves spots and film. Both look like "not cleaning" even when the machine is mechanically fine.
What you can check: Keep the rinse-aid dispenser filled and run a dishwasher cleaner or a cup of vinegar through an empty hot cycle monthly.
Worn wash pump or chopper Moderate
The wash pump pressurizes the spray arms and a chopper grinds food fine enough to rinse away. When either wears out, spray pressure drops and cleaning suffers even with a clean filter.
What you can check: If the filter, arms, and water temp are all good and dishes are still dirty, this is the tech diagnosis — a pump or chopper repair.
Is it worth repairing?
Almost always repair — the top causes are free or a cheap part, and even a wash-pump job is well under the cost of a new dishwasher plus installation. Replacement only makes sense on a very old unit facing a pump failure plus other issues.
Frequently asked questions
Why is my Samsung dishwasher not cleaning?
A Samsung dishwasher that isn't cleaning usually comes down to a clogged sump/filter, a spray arm that isn't spinning, or a fill/drain problem so the tub doesn't hold enough clean water. Samsung dishwashers also throw clear error codes — an OE, 5C, or LC on the panel points you straight at the cause.
Is there a known issue with Samsung dishwashers not cleaning?
Samsung dishwashers are prone to sump and drain clogs, and a machine that doesn't drain fully will "wash" the next load in leftover dirty water — the top complaint behind "it stopped cleaning." Clean the filter and clear the drain path first; an OE or 5C code confirms it.
Why is my dishwasher not cleaning the top rack?
The top rack is usually fed by the middle spray arm — if its jets are clogged or it can't spin, or the top rack's water supply tube is blocked, the top comes out dirty while the bottom is fine. Clear the arms and make sure nothing blocks them.
Why are my dishes gritty or filmy after washing?
Gritty means a clogged filter recirculating food; filmy usually means water that's not hot enough, no rinse aid, or hard-water scale. Clean the filter, pre-run hot water at the sink, and keep rinse aid filled.
How much does it cost to fix a dishwasher that won't clean?
Most of the time it's free (filter/arms/water temp) or a low-cost part. A wash-pump repair is around $130 flat labor plus the part, and your $50 Quick Check credits toward it.