Technically, the dishwasher machine will turn on, fill with water, and run its internal timer cycle without a spray arm attached, but it will not actually wash any dishes. The spray arms act as the primary distribution mechanism that propels pressurized water across the upper and lower racks. Without them, the water has no directional force to clean food residue off your plates. Running the machine in this condition results in completely dirty dishes and can disrupt proper water drainage and pressure circulation within the pump system.
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