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LG Dishwasher Not Cleaning

LDS4821ST

The part(s) or condition(s) listed below for the symptom Dishwasher not cleaning are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for Dishwasher not cleaning

Cause 1Water Inlet Valve

The water inlet valve opens to allow water to enter the dishwasher. If the valve is clogged or defective, the dishwasher won’t get enough water to clean dishes properly. If the water inlet valve is clogged, replace it. Do not attempt to clean the water inlet valve—cleaning the valve could make it more likely to fail.

Part Testing
Parts
Water Inlet Valve for your LGDishwasher
Water Inlet Valve - Part # 3282910 Mfg Part # 5221DD1001F

Dishwasher water inlet valve. If the dishwasher won't fill properly, then the water valve is likely restricted and will need replacement. If the dishwasher is under filling, it won't clean dishes effectively.

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Cause 2Center Wash Arm Assembly

The center wash arm circulates water to the dishes in the upper rack. If water can’t flow properly through the center wash arm, the dishes in the upper rack won’t be cleaned properly. Over time, food particles can get trapped in the tiny holes in the wash arm. If your dishes are coming out dirty, the wash arm might be clogged. To unclog the center wash arm, remove the wash arm and dislodge any debris from the holes. If the wash arm is extremely clogged, replace it. In addition, make sure that the center wash arm assembly is mating properly with the water supply nozzle.

Parts
Center Wash Arm Assembly for your LGDishwasher
Center Wash Arm Assembly - Part # 1268146 Mfg Part # 5249DD1001A

Wash arm on bottom of upper rack

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Cause 3Lower Wash Arm Assembly

The lower wash arm circulates water to the dishes in the lower rack. If water can’t flow properly through the lower wash arm, the dishes in the lower rack won’t be cleaned properly. Over time, food particles can get trapped in the tiny holes in the wash arm. If your dishes are coming out dirty, the wash arm might be clogged. To unclog the lower wash arm, remove the wash arm and dislodge any debris from the holes. If the wash arm is extremely clogged, replace it.

Parts
Lower Wash Arm Assembly for your LGDishwasher
Lower Wash Arm Assembly - Part # 1268389 Mfg Part # AGB32598301

Lower wash arm nozzle assembly

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Cause 4Wash Impeller

The wash impeller is a small plastic blade that forces water up through the wash arms. If the impeller is broken or is missing some of its fins, it might not generate enough pressure to force the water up through the wash arms. On most models, you can replace the wash impeller independently of the pump and motor assembly. Search for your model number to determine if your impeller is replaceable. If the impeller cannot be replaced separately, you will have to replace the entire pump and motor assembly.

Parts
Wash Impeller for your LGDishwasher
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Cause 5Upper Wash Arm Spinner

The upper wash arm circulates water to the dishes in the upper rack. If water can’t flow properly through the upper wash arm, the dishes in the upper rack won’t be cleaned properly. Over time, food particles get trapped in the tiny holes in the wash arm. If your dishes are coming out dirty, the wash arm might be clogged. To unclog the upper wash arm, remove the wash arm and dislodge any debris from the holes. If the wash arm is extremely clogged, replace it.

Parts
Upper Wash Arm Spinner for your LGDishwasher
Upper Wash Arm Spinner - Part # 1268148 Mfg Part # 5249DD2001A
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