If a dishwasher spray arm does not appear to spin, turn the machine off and let it cool before checking for a tall dish, utensil, or rack position that blocks the arm. Gently turn the accessible arm by hand only when the dishwasher is off. Check the selected cycle: some top-rack-only programs do not run the lower arm. Clean the owner-accessible filter and inspect spray openings if the manual allows it. If the arm turns freely but dishes stay dirty in a repeatable pattern, the issue may be low fill, weak circulation, a diverter, or a damaged arm. Arrange diagnosis rather than running repeated cycles with an open door.
One rack stays dirty Likely cause: Blocked arm, rack-only cycle, or diverter problem. Homeowner action: Check cycle and whether dishes obstruct that rack's arm.
Arm hits a pan or utensil Likely cause: Loading clearance. Homeowner action: Move the item and spin the arm gently with power off.
Grit returns to dishes Likely cause: Dirty filter or poor circulation. Homeowner action: Clean and reseat the user-serviceable filter.
Arm is hard to turn by hand Likely cause: Debris, distorted arm, or rack interference. Homeowner action: Remove visible obstruction without forcing the arm.
No wash sound after filling Likely cause: Circulation pump or control concern. Homeowner action: Record timing and error code; arrange service.
Water remains at cycle end Likely cause: Drain problem rather than only an arm problem. Homeowner action: Stop and follow the drainage guide before another wash.
DIY difficulty: Low for cycle, loading, filter, and visible arm checks. Time: 15-30 minutes plus one normal wash. Tools: Owner manual, flashlight, soft cloth. Safety risk: Moderate from hot water, sharp utensils, and electrical parts. Call a professional: Arm turns freely but a rack stays dirty, pump hums, machine leaks, or error codes recur.