Built-in dishwasher with the door open and racks pulled out

Generic photo: Castorly Stock · Pexels License

Dishwasher spray arm not spinning

Most stalled arms are blocked by dishes or have jets clogged with soil or scale. Next check the arm mount, the filter and water level, and finally the wash pump output. An arm needs both free movement and enough water pressure to turn.

Cross-checked ~30 min easyBrands: All

Before you start

Power off and let the water cool before reaching into the tub

Diagnostic steps

Unlock all 8 steps with expected values

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

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Dishwasher detergent dispenser won't open (detergent left in the cup)

First rule out blocking dishes, caked detergent and an unfinished cycle. Then test the dispenser actuator (a wax motor or bimetal/solenoid on most units) for an open circuit, and check whether the control sends 120 V to it during the wash. A cup that opens but leaves detergent behind is a wash problem, not a dispenser problem.

8 steps ~45 minmoderate

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Gritty or sandy residue on dishes after washing

Grit is usually redeposited soil: a clogged filter, a drain that cannot clear (air gap, disposer, hose) or detergent that did not dissolve. Hard water causes white film rather than grit. Work from the filter outward, then check the drain path and the wash motor.

8 steps ~30 mineasy

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Dishwasher completely dead: no lights, no response (supply, door switch, thermal fuse)

Prove supply voltage at the junction box with a meter before blaming any part. Then check the door switch circuit and, on units that have one, the one-time thermal fuse near the control. Replace the control board only after these pass.

8 steps ~45 minmoderate