Question CPU fan error on cold start.

[Rick H]

When doing a cold boot (intel i5 cpu and windows 10) I get the cpu fan error and have to enter bios. There I see the fan is not turning but if I wait and watch the cpu temp rise the fan will start when cpu reaches 60 deg C. I have tried altering the fan profiles , even full speed, to no effect. is this a bad fan? Boots normally when warm.

 

[drea.drechsler]

When doing a cold boot (intel i5 cpu and windows 10) I get the cpu fan error and have to enter bios. There I see the fan is not turning but if I wait and watch the cpu temp rise the fan will start when cpu reaches 60 deg C. I have tried altering the fan profiles , even full speed, to no effect. is this a bad fan? Boots normally when warm.

Make sure the fan curve lowest value is not '0'. It's basically suggested to set the lowest CPU fan speed value the highest speed that isn't audible or bothersome and go up from there.

Also could try turning off CPU fan failure warning in BIOS if it has such a setting.

 

[Rick H]

Make sure the fan curve lowest value is not '0'. It's basically suggested to set the lowest CPU fan speed value the highest speed that isn't audible or bothersome and go up from there.

Also could try turning off CPU fan failure warning in BIOS if it has such a setting.

All of the fan curves have the initial speed at least 500 rpm. The behavior I described occurs even if the fan is set to full speed all the time. If I turn off the fan warning I am afraid I wouldn't know if the fan quit completely.

 

[drea.drechsler]

All of the fan curves have the initial speed at least 500 rpm. The behavior I described occurs even if the fan is set to full speed all the time. If I turn off the fan warning I am afraid I wouldn't know if the fan quit completely.

Have you just tried it to see if the warning goes away?

Do you leave the system powered constantly or for very long periods, especially unattended? Usually, those warnings are for high-duty cycle systems as most people will become aware that the fan failed while using it. You can set a fan speed that you can hear but isn't intrusive, so if it goes away you'll know it; that's usually best anyway.

Usually a BIOS will spin up all fans at boot to test them (part of POST); Is the CPU fan not spinning up during that time? Do chassis fans? If not, I'd be wondering if your CPU Cooler/Fan has a built-in temp sensor that won't turn the fan on until the CPU warms up. If so, it can't spin up even if the BIOS commands when starting cold.

What CPU cooler are you using? Is this a recent change in behaviour? or has it always done it?

 

[Rick H]

Have you just tried it to see if the warning goes away?

Do you leave the system powered constantly or for very long periods, especially unattended? Usually, those warnings are for high-duty cycle systems as most people will become aware that the fan failed while using it. You can set a fan speed that you can hear but isn't intrusive, so if it goes away you'll know it; that's usually best anyway.

Usually a BIOS will spin up all fans at boot to test them (part of POST); Is the CPU fan not spinning up during that time? Do chassis fans? If not, I'd be wondering if your CPU Cooler/Fan has a built-in temp sensor that won't turn the fan on until the CPU warms up. If so, it can't spin up even if the BIOS commands when starting cold.

What CPU cooler are you using? Is this a recent change in behaviour? or has it always done it?

I haven't yet tried disabling the warning but will do that. The fan does not spin up during the POST if system is cold. I had a theory that the fan was just getting worn bearings and took more voltage to get going but i don't think that is it. This is new problem that I have not had before. the system is about 4 years old and is left running most of the time. It generally only gets a restart for a software upgrade or maybe once a week from cold state. The cooler is an Intel that came with the motherboard which is ASUS.

 

[drea.drechsler]

.....The cooler is an Intel that came with the motherboard which is ASUS.

You're first guess seems the correct one, it's time for a new cooler...