Plug in "Cooling Fan Manufacturer" power plug, electric fan gear switch is pressed, the ears close to the fan motor parts audible buzzing sound, and found that fan blades slightly moving a bit but does not work, if this failure phenomenon cause, we can determine the initial failure in "Cooling Fan Manufacturer" parts of the fan head, that fan base to hold fast to the motor shaft, reducing motor run capacitor capacity and other reasons. After the judge should immediately turn off the fan switch is complete, either directly unplug "Cooling Fan Manufacturer" power plug, so as not to burn out the fan motor.