Running a dishwasher without a spray arm is technically possible, but it is strongly discouraged because the appliance will fail to clean your dishes entirely. The rotating spray arms are solely responsible for pumping water under pressure across all racks to wash away food residues from plates, bowls, and silverware. Without the spray arms distributing water streams, the machine will simply fill the bottom basin with water without spraying it upward, leaving your load completely unwashed, dirty, and covered in dried detergent residue at the end of the wash cycle.
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