A hum with no movement means the motor is powered but something is stopping the drive. Check whether the door is jammed or the spring is broken: disconnect the operator and lift the door by hand. If it is heavy, the problem is the door. If the door moves freely, the drive wheel, chain or belt may be slipping, or a gear inside the motor head may be stripped. A failed start capacitor or control board can also cause a hum. Stop pressing the remote, as repeated attempts can burn the motor.
