How to Fix CPU Fan Error on Asus?

Fix CPU Fan Error on Asus – When you see the error message “CPU FAN Error” in POST, it means the system doesn’t detect the FAN. If you install another brand of CPU FAN with lower revolutions speed, the system may not be able to correctly detect it. You can try to set “CPU Fan Speed Low Limit” to 200 RPM in BIOS configuration.

Fix CPU Fan Error on Asus

How can I Get Rid of CPU Fan Errors?

1. Lower the Default Fan RPM in BIOS

  1. Boot into BIOS on your PC.
  2. Navigate to CPU Fan settings. The sections might differ based on your motherboards. Important thing is to look for anything related to the CPU Fan control, usually found in the Advanced settings menu.
  3. Now, locate the setting that regulates RPM warnings. The default value should be around 600 RPM (rotations per minute).
  4. Lower the default value to 300 RPM and save changes.
  5. Exit BIOS and boot into the system.

2. Disable CPU Fan Speed Monitoring in BIOS

  1. Boot into BIOS.
  2. Navigate to the aforementioned Advanced settings.
  3. Look for the Monitoring (Monitor) section.
  4. Change the CPU Fan Speed to Ignore and confirm changes.
  5. Boot into Windows and look for improvements.

How to Fix CPU Fan Error on Boot/Startup

This error may be related to hardware or software so the fixes may differ for each user.

Users who are using Corsair or NZXT Kraken AIO CPU cooler mistakenly connect the wrong pump header in the motherboard. Hence see this error message.

1. Make Sure CPU Fan is Connected Properly

This fan error is appearing on Asus & megatrends motherboard because either nothing is connected with the cpu_fan header or it’s plugged in the wrong header.

  • Please make sure the CPU FAN is installed on the right position of the motherboard and twist the screws tightly
  • For those who are using a water cooler i.e. H100i or H100i V2 and still fan speed error pops up, connect the hydro pump to the AIO_PUMP header (not in CHA_FAN).
  • Ensure that the CPU FAN cable is securely installed to the CPU_FAN connector instead of the CHA_FAN.

2. Set CPU Fan Speed Lower Limit

Does the CPU fan is running at a required RPM? Most of the time the Asus fan error gives you a hint that the fan is underperforming about its RPM.

For users who are using NZXT, Corsair fan with lower revolution speed, the system may not be able to correctly detect it. Set the “CPU Fan Speed Low Limit” to 200 RPM in BIOS configuration.

To change fan speed lower limit, follow these steps:

  1. Get into BIOS by pressing the F1, F10, or Delete key upon startup.
  2. Navigate to the CPU fan settings within Advanced Settings. (This section may vary with your motherboard’s model.
  3. Find the setting that controls the CPU fan RPM alerts. The default value should be 600 RPM (Revolutions Per Minute).
  4. Lower the default to 300 RPM to 450 RPM and Save the changes.
  5. Exit the BIOS and boot the system.

3. Disable CPU Fan Speed Monitoring in ASUS BIOS

If the CPU fan error is appearing but the fan is working then you can disable this alarm. Follow these steps:

  1. Boot into BIOS.
  2. Navigate to the aforementioned Advanced settings.
  3. Look for the Monitoring (Monitor) section.
  4. Change the CPU Fan Speed to Ignore and Confirm changes.

4. Update BIOS

Most of the time fan errors on ASUS and Megatrends are related to BIOS software malfunctioning. If you simply update the BIOS version to its latest then you are good to go.

5. Check Fan Settings in BIOS

If you have recently changed the BIOS settings then it may be a cause why the Asus fan error is appearing.

  1. Open BIOS
  2. Select Advanced Settings.
  3. Select Hardware Monitor.
  4. There you will see the CPU Fan option.
  5. Enable Active Heat Sink and Fan Duct with Fan.
  6. Disable Passive Heat Sink and Fan Duct without Fan.
  7. Save your changes and exit BIOS.

6. Replace The CPU Fan

If the error is still appearing on the Asus motherboard on boot up, then it may be a hardware problem. You need to buy a CPU fan and replace it with a broken fan.

Also Read: Easy Tips and Ways to Speed up Windows 10

7. Clean the CPU Fan

The dust is the enemy of computer hardware. When dust builds up inside it blocks fins to rotate at ideal speed. You should regularly clean the CPU fans. To do this turn of the PC unplug the power cable and use canned air to blow the dust off.

8. Try an Alternate CPU Fan Header

Modern motherboards have multiple fan headers if one header doesn’t work. Try plugging the fan into a different slot. This sometimes fixes the CPU fan error.

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