The 4 most common part(s) or condition(s) which cause the symptom Dishwasher doesn't clean are listed below starting with the most likely. Check or test each item and watch any available videos.
RepairClinic Item # 1194371
If the dishwasher won't clean dishes, it might not be getting enough water. There is an electrical valve called a water inlet valve which opens to allow hot water into the dishwasher. If this valve has failed or is clogged the dishwasher won't clean the dishes properly. The valve cannot be cleaned or repaired and should be replaced.
RepairClinic Item # 1194322
If the dishwasher won't clean dishes, check the lower wash arm assembly. If the lower wash arm isn't getting water, all of the dishes in the lower rack will come out dirty. Check to be sure the lower wash arm assembly spins freely. Also check to be sure the little holes in the lower wash arm aren't clogged or blocked.
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RepairClinic Item # 1194323
If the dishwasher won't clean dishes, check the upper wash arm assembly. If the upper wash arm isn't getting water, all of the dishes in the upper rack will come out dirty. Check to be sure the upper wash arm assembly is intact. Also check to be sure the little holes in the upper wash arm aren't clogged or blocked.
RepairClinic Item # 1488941
If the dishwasher won't clean dishes the circulation pump might have failed. If there is no noise coming from the circulation pump after the dishwasher has filled, the pump itself might be burned out. Unfortunately, there isn't any easy way to test the circulation pump. If other components have been tested and they check out OK, the circulation pump might need to be replaced. This job is somewhat difficult but many DIY'ers are successful replacing the circulation pump.