If a motor hums but does not start what is wrong?

If a motor hums but does not start, it could indicate a few potential issues. One common cause is that the motor is jammed or obstructed, preventing it from turning. Another possibility is that the capacitor is faulty or the electrical supply is inadequate, leading to insufficient torque to start the motor. Additionally, a malfunctioning start switch or relay could also be preventing the motor from engaging properly.