Cooling Fan does not work, abnormal sound in the case of the need to stop the equipment, check out the fan is where the problem, the following is what causes the general non-operation of abnormal sound? 

1, may be the balance of soil off, resulting in non-rotation, the sound of the fan abnormal, the need to replace the balance of soil and position. 

2, may be due to improper welding lead to virtual welding, not detected leading to outflow, need to contact the manufacturers of welding processing. 

3, may be IC failure, returned to the manufacturer by the engineering evaluation, replacement of the new IC. 

4, may be due to improper operation caused by the burning of the cooling fan, the need to send back to the factory for testing. 

The Cooling Fan does not work or has the unusual sound, first contact with the manufacturer, when the first use, needs to confirm the good parameter, first purchases the sample to carry on the test, whether meets own equipment's cooling demand, the above is the cooling fan does not run abnormal sound of the simple explanation, if there are other problems can directly contact us to help you solve the cooling fan problem.