Running your dishwasher without a spray arm is strongly discouraged, because the spray arms are fundamentally responsible for distributing water and detergent across your dishes. If you run a cycle without an upper or lower spray arm, water will simply pool or spray uncontrollably from the exposed water feed manifold without circulating over the racks, leaving your plates, bowls, and silverware completely unwashed, covered in leftover food particles, and caked in undissolved dishwasher detergent. Additionally, open water delivery ports can experience pressure imbalances. Always reattach or replace a missing spray arm before starting a wash load.
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