How to Fix CPU Fan Error Asus on Boot

Last Updated on June 8, 2022

The cooling fan in your PC is an integral part of the CPU. It keeps the entire unit cool by dissipating the heat. Your PC’s well-being is jeopardized if the fan stops working or gets clogged due to dust accumulation. Hence, you must ensure that your PC’s fan works in mint condition to ensure proper heat exchange.

Many Asus users have reported a CPU fan error on boot. Your computer shuts down as a result, to keep things safe from malfunctioning or overheating. If the computer runs without a fan working, it is inevitable that components will heat up, and your CPU can suffer from potential damage.

Please note that the CPU fan and your PC fan are different things. While you can add any fan to our PC but a CPU fan is an essential and irreplaceable component.

In this article, we will discuss how you can fix the CPU fan error Asus on Boot. All of the fixes are simple and don’t require much technical knowledge.

Let’s check all the fixes you can use to fix the CPU fan error! You can also use these fixes on Megatrend PCs.

Fix # 1:  Check that the CPU fan is properly connected

Check that the CPU fan is properly connected

Most of the time, CPU fan error on boot comes due to improper connection of your fan.  Either nothing is connected to with CPU_FAN header, or the CPU fan is plugged in the wrong header. Let’s see how you can troubleshoot it.

  • Check that the CPU fan is installed in the right position of the motherboard and twist the screws to ensure proper connection.
  • Check and ensure that the CPU fan cable is connected to the CPU_FAN connector and not the CHA_FAN connector.
  • If you are using a water cooler and experiencing a fan speed error, connect the hydro pump to the AIO_PUMP and not the CHA_FAN header.

Fix # 2: Lower the CPU fan speed

Asus fan error is a big hint that the fan is underperforming and needs to be fixed. The best way to deal with this problem is to change the fan speed lower limit. Let’s see how you can do it.

  • Enter BIOS mode by hitting the F1, F10, or Del key at startup.
  • Go to Advanced Settings and look for CPU Fan Settings. Please note that wordings for these sections may vary from one motherboard model to another.
  • Look for settings that control the CPU fan RPM speed. The default value will is set to 600 RPM. You need to change it.
  • Lower the default setting to 300 to 450 RPM. Ignore the warning prompt and save the settings.
  • Asus recommends lowering the setting to 200 RPM if you install CPU fan from another brand because the system may not be able to recognize it.
  • Exit BIOS and restart your system to check if the problem has been solved.

Fix # 3: Disable CPU Fan speed in BIOS

It may happen that the CPU fan is working correctly, but you still get a fan speed error at startup. You can disable this alarm easily by working in BIOS. However, you must only do so if you are sure that the CPU fan is working properly.

  • Enter BIOS at startup by pressing the F1, F10, or Del key.
  • Enter Advanced Settings.
  • Select Monitoring Section.
  • Look for CPU fan speed and change it to ignore.
  • Save changes, exit BIOS, reboot your system and see if the problem has been solved.

Fix # 4: Update BIOS on your PC

Asus and Megatrends fan error can also come due to an outdated BIOS version. If this is the case, you need to update BIOS on your system. Here’s a simple guide on updating BIOS in your system.   

Fix # 5: Adjust the Fan setting in BIOS

Another common fix that you can use to deal with a problematic fan on Asus systems is adjusting fan settings in BIOS. Please note that this is different from adjusting the lower RPM and lets you control heat sink settings.

  • Go to BIOS by pressing the F1, F10, or Del key.
  • Navigate to Advanced Settings and select Hardware Monitor.
  • Look for the CPU Fan option in the list.
  • Open it and enable Active Heat Sink and Fan Duct with Fan.
  • Disable Passive Heat Sink and Fan Duct with Fan.
  • Save the recently made changes and exit BIOS.
  • Restart the system and see if the fan is operating correctly now.

Fix # 6: Clean the CPU Fan

Dust and debris can paralyze your PC and laptops. If dust builds inside the CPU fan, it can slow down the rotation and stop the fan from spinning at ideal speed.

To make sure that your CPU fan and other components stay free from dust and debris, you need to clean it regularly. An easy way is to use canned air to blow the dust out from your CPU fan.

Fix # 7: Connect the CPU fan to an Alternate Fan Header

Try connecting your CPU fan to an alternate fan header. The latest Asus models come with multiple fan headers that offer convenience and ease of use if one fan header stops working.

Fix # 8: Replace the CPU Fan

If you have tried everything and are still facing the same problem, it is best to replace the CPU fan. Repairing it isn’t a good idea because you can’t risk it. Make sure you buy one that is compatible with the Asus motherboard.

Frequently Asked Questions

What does a CPU fan error mean?

CPU fan error is a common message that millions of users complain about. It means that something is wrong with the fan on your motherboard, and the CPU has overheated. Most of the time, it can be fixed by altering some settings in BIOS.

Does cleaning help in keeping my CPU fan in mint condition?

Yes. Dust and dirt are the biggest enemies of the CPU fan and every other component in your PC. If the surroundings of your PC have dust, it will catch more dust and hence will go bad quickly.

Final Words

Keeping the fan on the motherboard working properly is critical to ensure your PC’s optimum performance. You must take proper steps to ensure that you clean the space around your PC to ensure minimum dust exposure. Moreover, you must listen closely when the CPU fan is running; a heavy and loud sound buzz means that fan is dirty and needs to be cleaned.   

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