fan turns off when it reaches the high RPM

I have a pavilion dv6-6170us laptop.when I work with windows and the fan of web navigation works normally but when I start a game or the CPU usage increases and temperature increases the fan works more quickly, but after a few minutes (3-5), it turns off, then off again.this it happens a few times and then fan stops completely working.cpu temperature reached 90-95 degrees (centigrade) and I have to turn off the laptop in order to avoid the rotation of damage.after of material the laptop still Once, I get a 70 b error code that says fand does not work correctly. but after leaving for about an hour or more it starts to work normally again.and when I opened the Task Manager, I see the CPU usage is almost always 20-25%, but there is no process of this heavy.
any suggestions?

Abolfazl,

I'm not an expert "fan".  I am not a fan-only diagnosis, but you may certainly a complete diagnostic on the computer system to find out what you can about the condition of the equipment.

Recommended reading:

Reduce the heat in the PC - c01657439

Excerpt from the Guide:

Step 4: Test the hardware failure

If the problem persists after you have cleaned the vents and to move the computer into a cooler room, a piece of hardware may be damaged. Test the computer to see if any hardware, such as memory, processor or graphics hardware, have failed. Laptops more than HP and Compaq have diagnostic software to check hardware failures. For more information, see hardware failures (Windows 8) test , test material (Windows 7 and Windows Vista) failures or check your laptop using the HP health Scan (Windows XP) system .

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