Some motherboards feature 4-pin fan headers that don’t use a PWM signal on Pin 4 to control the fan speed, but rather reduce the voltage on Pin 2 (like a standard 3-pin fan header). My Noctua PWM fan starts to spin when the PC boots but then stops, is it faulty? using the supplied U.L.N.A.), please adjust the threshold in the BIOS or disable CPU fan error warning. If you want to run the fan below this speed (e.g. Some motherboards display a CPU fan error when the fan speed falls below a certain threshold, e.g. I get a CPU fan error although the fan is running, is it faulty? Please verify whether the fan starts spinning at higher CPU temperatures, remove any Low-Noise or Ultra-Low-Noise Adaptors or deactivate your motherboard's automatic fan controller in the BIOS. If you've connected the fan directly (or using the supplied Low-Noise or Ultra-Low-Noise-Adaptors) to your motherboard, it's possible that the motherboard's automatic fan controller doesn't provide the required starting voltage due to the low CPU temperature. My fan doesn’t spin when I start up the PC, is it faulty? Modified on: Tue, 22 Nov, 2022 at 1:44 PM
Solution home Frequently Asked Questions Fan FAQs My fan is not working as intended, is it faulty?
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