cpu fan error
Easy Fix
Microsoft · Windows
BIOS/UEFI detected that the CPU fan is not spinning or is spinning below the minimum RPM threshold — the system may shut down to prevent CPU overheating
Quick Answer
Error code CPU Fan Error on your Microsoft Windows means: BIOS/UEFI detected that the CPU fan is not spinning or is spinning below the minimum RPM threshold — the system may shut down to prevent CPU overheating. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Power off the PC and unplug it. Open the case and verify the CPU fan cable is firmly connected to the motherboard header labeled CPU_FAN (not CHA_FAN or SYS_FAN)
2
Visually inspect the CPU fan — spin it gently with your finger. If it does not spin freely, it may have seized from dust or bearing failure
3
If using an AIO liquid cooler, the pump header should be connected to CPU_FAN (or AIO_PUMP if your board has one). The radiator fans go on separate fan headers
4
Clean the CPU fan blades and heatsink fins with compressed air to remove dust buildup
5
If the fan works but still triggers the error, enter BIOS and lower the CPU Fan Low Limit speed threshold (often under Monitor or Hardware Monitor section)
6
To bypass the warning temporarily: in BIOS, change 'CPU Fan Speed Low Limit' to 'Ignore' or 'N/A' — but only if you have verified cooling is adequate
7
If the fan is dead, replace it with a compatible CPU cooler
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Replacement CPU fan or cooler if fan has failed
Compressed air for cleaning
Cable ties for cable management
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