Whirlpool garbage disposal hums but does not spin when switched on.

Safety first: Turn off the wall switch, unplug the disposal, and shut off the circuit breaker. Never work on the disposal while it is energized.

• Check reset button: Press the red reset button on the bottom of the Whirlpool disposal. If it clicks, it had tripped.
• Manually rotate: Insert a disposal wrench or 1/4" hex key into the hex socket on the bottom of the motor. Rotate back and forth until it moves freely.
• Remove obstruction: Shine a flashlight into the drain and use tongs or pliers to remove any visible objects (utensils, bones, glass). Do not insert your hand.
• Test operation: Restore power, run cold water, and briefly turn on the disposal. If it still only hums, the motor windings may be damaged and the unit should be replaced.