How to Fix CPU Fan Error on Boot? Best Guide

The CPU fan error on boot is a typical problem that happens when Windows PCs or laptops are booted. This terrible error message is a warning indicator that indicates a CPU fan failure during boot or after an unexpected system shutdown due to overheating.

Many people are able to resolve the issue without having to replace the CPU fan. By adjusting several computer settings, we were able to narrow down the probable cures for the CPU fan problem.

So, if you’re wondering how to cure CPU fan issue, keep reading to learn how to remedy this vexing problem without spending a dime.

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Reasons of CPU Fan Error

There are a few possible causes of the CPU fan error yet the fan is operating. So, have a look at some of them below:

  • As a result of both hardware and software difficulties
  • Fan physical damage
  • Incorrectly setting your fan information in the BIOS interface
  • Dust or other particles block the device air vents and cause the CPU fan problem

When is the CPU Fan Error Displayed

Typically, the CPU fan problem on start-up arises during the booting or starting phase of a Windows PC. And the following error notice will appear on your screen:

The issue usually shows during a Windows PC’s bootup or start-up procedure; it does not appear during normal Windows usage. The error message wording is often one of the following:

  • “CPU Fan Error”
  •  “Error: The CPU Fan Failed!”
  • CPU Fan Error on Boot, although Fan Is Running”

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How to Repair a CPU Fan Error During Boot/Start-up

Those that use a Corsair, NZXT Kraken AIO CPU cooler attach the incorrect Fan Header to the motherboard. As a consequence, the motherboard will recognise this problem. Incorrect BIOS settings are another cause of CPU fan issue on boot.

1: Examine the BIOS settings for the CPU fan.

Perhaps you recently updated your BIOS or altered the boot settings. If so, perform troubleshooting to resolve the technological issues.

When the Fan Error appears, you will be instructed to hit F1 to enter BIOS. For various motherboards, the command to enter BIOS could be different.

  1. Access BIOS
  2. Choose Advanced Options.
  3. Opt for Hardware Monitoring
  4. The CPU Fan option is located there.
  5. Turn on the fan duct and active heat sink.
  6. Turn off the fan duct without a fan and the passive heat sink.
  7. Save your adjustments and quit the BIOS.

2: Lower the BIOS fan speed default.

Have you ever looked in your BIOS for a CPU fan RPM restriction or something similar? The fan error often serves as a warning that your CPU fan may not be operating at peak RPM.

Many people add a different type of CPU fan, such as Corsair, NZXT, or ASUS, which spins at a slower rate. The system is unable to accurately identify fan speed at this speed. Simply set the BIOS configuration’s “CPU Fan Speed Low Limit” to 300 RPM.

Check out our separate post on Best CPU under $300

Boot into your computer’s BIOS to solve it.

  1. Access the settings for the CPU fan. (The settings in this section should be connected to controlling the CPU fan; however, this depends on the motherboard model. This option is often found under Advanced Settings in BIOS).
  2. Locate the option that manages the CPU fan RPM notifications. The suggested value is 600 rpm (revolutions per minute).
  3. Increase the default speed from 300 to 450 RPM, then save the adjustments.
  4. Leave the BIOS and start the computer.

3. Disable the ASUS CPU Fan Error Within BIOS

You can detect if anything is broken by looking at the BIOS fan error. If you ignore it, the heat might rise over the typical CPU temperature range, irreversibly harming your hardware.

However, if your CPU fans are operating but you still see a fan error on starting up your computer, follow these instructions.

  1. Start by entering your BIOS.
  2. Visit the aforementioned Advanced Settings page.
  3. Find the area labelled “Monitor.”
  4. Set the CPU fan speed to Ignore and double-check your adjustments.
  5. Launch Windows and search for upgrades.

If your machine already has a liquid cooling system, you may also set the CPU fan speed to Ignore.

Do check our latest post on the How Hot is too Hot for CPU – Temperature Guide

4. Check the motherboard’s fan connectors

It’s possible that you connected the CPU fan to the incorrect header. when the Primary Header is accidentally plugged in instead of the Fan header optional. Your motherboard will believe there is no fan attached, resulting in a fan error when you power up.

  1. To correct this problem, confirm that the motherboard header and CPU FAN are installed correctly.
  2. Rather than the CHA FAN connector, make sure the CPU FAN cable is firmly attached to the CPU FAN connection.
  3. If the CPU fan speed problem still appears despite using a water cooler like the H100i or H100i V2, consider connecting the hydro pump to the AIO PUMP header rather than the CHA FAN header.

5. Try using a different CPU fan header.

Try connecting the fan to a different slot if your system has various CPU fan headers. This can occasionally resolve the ASUS CPU fan boot fault.

6. Troubleshoot software by running it.

Sometimes the BIOS software is connected to the fan issue. Observe these guidelines:

  1. Press the F1 or F10 key to access the BIOS settings.
  2. Next, navigate to the Fan Control Section under Advanced Settings > Hardware Monitor.
  3. Ensure that the Q-Fan control setting on the CPU is set to Enabled.
  4. Once activated, you will notice the CPU fan’s reduced speed restriction. Change this setting to Ignore.
  5. Restart your computer.

Check to see whether the ASUS CPU fan error on boot/start-up fixes the issue now.

7. Remedy: Update the BIOS

Most of the time, the issue is promptly resolved by upgrading the BIOS to the most recent version. Visit their website to update the BIOS version if you have an ASUS motherboard and the fan issue appears. The American Standard functions in the same way.

Also, check out our separate post on How Hot is too Hot for CPU – Temperature Guide

8. Change the CPU Fan

Not least, the CPU fan might need to be changed. Check to see whether the CPU fan is not functioning correctly before doing that by opening the side panel of the computer case. Then get a new fan and swap out the damaged one.

9. Best Advice to address the American Megatrends CPU Fan Error

A member on the tech forum recommended this as a remedy. Since it worked for him, it can also help you with your issue.

When I would open the DELL and start-up, I would repeatedly receive this error. On the power supply, the fan functioned. The motherboard/fan processors were functional. The fan that wasn’t working was the one in front of the hard disc. On another PC, this fan was examined, and it performed well.

Tips to Prevent Computer Overheating Issues:

Well, the overheating of the computer can result in a number of additional major problems, including hard drive damage, unplanned system shutdowns, sporadic system slowdowns, freezing or hanging computers, etc.

Here are some basic suggestions to avoid PC overheating:

  1. Ensure that your computer’s internal fans are clean.
  2. Refrain from overclocking your system’s CPU and GPU.
  3. Put it in a cool, open area.
  4. Close the system’s casing to prevent dust buildup.
  5. Inspect the fan that powers the system.
  6. When not in use, turn off the system.
  7. Limit your use of computers by closing any open papers, games, or apps.
  8. To free up some space on your system, delete the huge files and folders that you don’t need.
  9. Remove any running apps.

Go through our epic guide on Best Motherboards for i7 9700K


In any case, the CPU fan error on boot is a frequent yet extremely annoying error message. Here, I did my best to provide a list of possible solutions to the boot-up CPU Fan problem.

Now that you are fully aware of the cause, be sure to use the best preventative measures to stop the problem from happening again.

FAQs for CPU Fan Error on Boot

Why does my BIOS keep saying CPU fan error?

Simply put, this error informs you that your motherboard is unable to recognise a CPU fan. The problem should be quickly fixed if your BIOS is current and your air or AIO cooler is fitted correctly.

Can you bypass CPU fan error?

Start the BIOS. Go to the previously stated Advanced options. the Monitoring (Monitor) section should be located. In order to ignore and confirm modifications, adjust the CPU fan speed.

How do I fix the CPU fan error on my ASUS motherboard?

Select Advanced Settings from the CPU Fan menu. Locate the CPU Fan Speed option. Alter the default setting (600 RPM) between 300 and 450 RPM. When finished, click Save and verify that the problem still appears when the BIOS starts.

How do I ignore CPU fans in BIOS?

Go to the Fan control area of BIOS rather than the monitoring part. The “CPU Q-FAN Control – Enabled or Disabled” setting for the CPU fan headers should be enabled. The “CPU Fan Speed Low Limit” setting will then appear; set it to Ignore.

Testing an Installed Fan?

Testing an Installed Fan
SpeedFan should be installed.
Launch SpeedFan, then wait for it to finish retrieving data.
Analyze the data displayed in the main application window.
Compare the CPU fan’s RPM data to the typical RPM range specified in the handbook or specifications sheet for the device.

Check out our expert-recommended Should I Overclock My CPU | Best Review

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By Anthony

Anthony knows a lot about computers. He grew to love writing reviews of the newest tech products. He likes to talk about everything Hardware. If you have any questions about Tech Products, feel free to ask.

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