Above all, to determine what "Tiny Cooling Fan" is not some external reason. Such as the plug is not plugged in, the fan switch is not fully open, the general fan should also pay attention to whether the timing of turn off, if these are not the problem, then it may be the reason fans fan itself. "Tiny Cooling Fan" own reasons may include a fan might too long, the electrical resistance increases, causing the blades can not rotate properly; fan motor overheating with a load capacity deteriorates, resulting in not rotate; internal motor short circuit protection device overheating; "Tiny Cooling Fan" start capacitance smaller; fan shaft axial clearance is too large will lead to fan problems.