CPU Fan Speed Detection Error
CPU Performance and Issues

CPU Fan Speed Detection Error: Causes and Solutions!

A “CPU fan speed detection error” means your computer’s motherboard can’t read the speed of the CPU fan, often showing up as an error message during startup. This could indicate a cooling issue that might lead to overheating.

A CPU fan is arguably one of the most critical elements in a computer. It lets the processor keep its temperature controlled, thus avoiding overheating and maintaining the general performance. 

A “CPU fan speed detection error” is not just a pestering message when booting up, but rather one of those warnings about a system’s health. Some causes, symptoms, and solutions to this widespread problem of keeping your computer running smoothly are given below.

What is a CPU Fan Speed Detection Error?

This is an alert of your motherboard if it cannot read the rotational speed of your CPU fan. At boot time, your motherboard checks the RPM at which your CPU fan runs. 

If it does not receive any signal or finds that the RPM is lower than this threshold value, then it alerts it sometimes causing a halt during the booting process so that the CPU does not overheat.

This error serves as a protective mechanism, preventing your CPU from being overheated and causing possible damage due to thermal stress.

Causes of the Error:

Causes of the Error:

There are many reasons why a CPU fan speed detection error can occur:

Loose or Improper Connections:

  • The connector of the fan may not be pushed fully into the CPU_FAN header of the motherboard.
  • Connecting the fan to the general case fan header instead of the dedicated CPU_FAN header may also cause a problem.

Fan Failure:

 A faulty motor or damaged blades of a fan may cause an inconsistent or lower RPM.

Deterioration over time can decrease the performance of a fan

BIOS Settings Problems. There may be disabled fan speed monitoring function

Low RPM threshold value may be too high, so that the system may classify fans with slower speed as defective.

Dust and Debris:

Dust accumulation might hinder the spinning of the fan, thus lowering its performance and detection efficiency.

  • Low-Speed Fans: Sometimes, high-quality or energy-efficient fans run at a lower speed, which may fall below the motherboard’s default detection range.
  • Outdated BIOS Firmware: Older BIOS versions may not correctly detect newer hardware or RPM signals.

Symptoms of CPU Fan Speed Detection Error:

  • Errors When Booting This could involve something like “CPU Fan Error” or “CPU Fan Speed Detection Error” popping up on startup:
  • No Fan Movement: The fan within the CPU will sometimes stop working altogether, sometimes they just spin randomly.
  • Overheating: The CPU temperature may shoot up instantly without proper cooling.
  • System Won’t Boot: The system may not boot some systems as a precaution measure against damage.
  • High CPU Temperatures: The processor may overheat, which causes reduced performance or crashes.

How to Fix a CPU Fan Speed Detection Error?

1. Check the Physical Connection

  • Power Down and Unplug: Always power off your system and disconnect it from the outlet to ensure safety before handling any internal components.
  • Open the Computer Case: Carefully open the computer case to allow access to the motherboard and CPU fan for a proper inspection.
  • Verify Correct Fan Header Connection: Verify that the CPU fan is connected to the correct header on the motherboard, which is usually labeled as CPU_FAN, and not a general fan header.
  • Look for Damage on Cables: Check the cable that connects the fan for damage, such as frays or wear. If there is damage on the cable, it is best replaced to function correctly.

2. Clean the Fan

Dust accumulation can impede the performance of the fan. Use compressed air to clean the fan blades and the heatsink.

Ensure that the fan can turn freely without any obstruction.

3. Change BIOS Settings

Enter BIOS: Restart the computer and press the indicated key to enter BIOS screen, commonly Delete, F2 or Esc.

Select Monitor or Hardware Monitor menu:

Turn on Fan monitoring. Enable the fan speed monitoring feature.

Decrease the value of CPU Fan Speed Low Limit, which is a bit too high by default, by using +/- keys if your CPU fan has low RPM.

4. BIOS Firmware Update

Visit your motherboard manufacturer’s website to see if there is an updated BIOS available.

Follow the instructions carefully when updating the BIOS. Avoid interrupting the process to avoid corrupting the system.

5. Replace the CPU Fan

If the fan is dead or damaged, replace it with a new one. Make sure the new fan is compatible with your motherboard and CPU.

Why You Should Correct This Error Now?

Ignoring a CPU fan speed detection error can lead to grave consequences:

Overheating: Too much heat may shorten your CPU’s life and cause permanent damage.

System Instability: You may experience frequent crashes and performance problems due to thermal throttling.

Expensive Repairs: In case you ignore the problem, other components may be damaged, and this can be costly to repair.

CPU fan speed detection error AIO:

Typically, the “CPU fan speed detection error” occurs due to failure of the motherboard to detect the cooling system or when the fan fails to spin. The error would be solved by making sure that the AIO pump is connected to the proper motherboard header, which typically is marked as CPU_FAN. 

However, if the AIO has a separate header for the pump, it would need to be properly plugged in. If the problem persists, you can change the BIOS settings to disable the CPU fan speed monitoring. The system will then ignore the fan speed check.

CPU fan speed detection error ignore:

To prevent the detection error of the CPU fan speed in BIOS, do the following:

  • Reboot your computer, and press the Del or F2 key during the boot-up screen to access BIOS, depending on your motherboard.
  • Open the BIOS menu, specifically in Monitor or Hardware Monitor.
  • Find the CPU Fan Speed setting, which might be set to N/A or 0 RPM.
  • Set to Ignore. This will prevent the motherboard from monitoring the speed of the CPU fan.
  • Save and exit the BIOS.

This way you bypass the fan speed detection, which is useful in case of an AIO cooler or a fan with too low speeds.

CPU Fan Speed Detection Error on ASUS:

A “CPU fan speed detection error” on an ASUS motherboard is an error where your system fails to detect the speed of your CPU fan. This usually shows during the POST process. Such a problem may be brought about by a loose or faulty connection of the fan, improper installation, or a setting within the BIOS that needs adjustment.

Conclusion:

CPU fan speed detection error”: It’s a warning which notifies that the system is unable to detect the CPU fan. The above problem can be solved by checking the connection of the fan, cleaning the fan, adjusting BIOS settings, and if necessary, changing the fan. 

This error has to be sorted out early in order to avoid overheating that might lead to the total failure of the system.

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