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What cause error code 511 cpu fan not detected

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3 wire conductor fan. The 3RD WIRE IS THE fan sensor located in the fan's electronics this is malfinctioning come in tthe construction of the fan itself.

Posted on Aug 23, 2010

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Are you sure that the CPU Fan is running normally? This problem occurs when the CPU fan is stopped working or when it's not running properly, means when the temperature of the cpu is increased and can't be cooled by the Fan. Open the case and check the CPU fan, You can see this by power on the Machine while the case is opened. If possible, try with another CPU fan or clean the heat-sink. Applying Coolant Paste will be helpful.
Also check temperature (cpu temperature) from the Bios Settings.

If you need further help, let me know.

Good luck.

Thanks for using FixYa.

Posted on Aug 23, 2010

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  • Master
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Hi, the usual issue of this problem is the fan is already defective and needs to be replaced.
Cheers!!

Posted on Aug 23, 2010

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1 Answer

I have 4 brand new HP Compact 8200 Elite Convertible Mini Towers. 2 are giving me the error message 511 CPU Fan not Detected. On both computers the fans are running, so I am assuming they are not running...


If the option exists to turn off speed control on the fans and allow them to run on maximum I would try that first. Additionally if these are brand new warranted I would exercise the HP on-site warranty if this is available, usually Business machines from HP have on site repair.

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What makes 511-cpu fan not detected and 512-chassis not detected


Are you seeing this error on a system you built or a pre-built system? If it is a pre-built system, check that the fans are running. Next check where the fans are plugged in, the CPU fan must be connected to the CPU fan connector on your motherboard. The chassis (rear case fan) only needs to be connected to the motherboard if you want the monitoring/PWM (modulated fan speed) option. If your CPU fan is powered directly from the power supply, change this.

If this is a system you built or recently updated the case, check your fan power connections, as above. Next check the fan speed. My ASUS board will give the "CPU fan not detected" error if the CPU fan speed is too slow. A different CPU fan will solve the problem. (I got my fan with the CPU; it works fine.)

I hope this helps. Please add a comment with more information about your system for more assistance.

Cindy Wells

May 12, 2013 | Computers & Internet

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are you the one opening your desktop computer?

If you are, check your cpu-fan connector pin if its properly connected to the motherboard

If not

check if your cpu fan are working if it didn't rotate replace it with a new one

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if fix your problem click yes for vote

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Your drive is usually ok, but the chip controlling the drive is too hot to function properly. Try blowing your CPU fan out with compressed air, then start using a laptop cooler to keep it cool and this problem should go away.

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Please go to Bios setup and then Load the bios set up default, and restart the system.

If this not work, Please replace the CMOS battery maybe that battery is busted. and the do again"

"Please go to Bios setup and then Load the bios set up default, and restart the system. "

hope this help!

If not solve the problem please notify me, do not rate.

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