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The start switch sends voltage to the motor to start the trash compacting cycle. If the start switch is defective, the trash compactor will not start. If the trash compactor makes a humming noise but won’t start, this indicates that the drive motor may be defective. To determine if the start switch is defective, use a multimeter to test the start switch for continuity. If the switch does not have continuity when the switch is activated, replace it.