Testing your dishwasher spray arms to ensure they function correctly involves conducting a visual check, a rotation check, and a water flow test. First, open the door and manually spin both the upper and lower spray arms to verify they rotate smoothly 360 degrees without hitting any dishes or structural racks. Second, remove the spray arms and inspect all tiny nozzle holes for white calcium crust or food blockages. Third, run a short test cycle while listening for the distinct splashing sound of water hitting the interior walls, and check that dishes across all racks emerge thoroughly clean.
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