Question CPU fan always at full speed

[DROGOC0P]

The CPU fan is always at full speed, at low temps (30C), it runs at 2200RPM. BIOS Qfan control doesnt do anything, it lets me change speed but it stays the same. Speedfan does the same thing. Chassis fans work fine and can be controlled. I'm desperate. The noise is driving me insane, I've tried everything I could find.
COOLER IS COOLER MASTER BLIZZARD T2 ON ASUS B250M-A MOTHERBOARD

 

[PrinceTexasLoaf]

The CPU fan is always at full speed, at low temps (30C), it runs at 2200RPM. BIOS Qfan control doesnt do anything, it lets me change speed but it stays the same. Speedfan does the same thing. Chassis fans work fine and can be controlled. I'm desperate. The noise is driving me insane, I've tried everything I could find.
COOLER IS COOLER MASTER BLIZZARD T2 ON ASUS B250M-A MOTHERBOARD

Go to your bios where you adjust your fan, and make sure it's set to DC. I hope this helps.

 

[DROGOC0P]

Go to your bios where you adjust your fan, and make sure it's set to DC. I hope this helps.

It doesn't give me the option to set it to DC like it does with the other fans. Appreciate it anyway, man

 

[PrinceTexasLoaf]

It doesn't give me the option to set it to DC like it does with the other fans. Appreciate it anyway, man

Oh alright.

 

[DROGOC0P]

Oh alright.

It either says PWM or disabled under qfan control. Maybe it thinks it's PWM? its been working fine for years now, and out of nowhere it started going full speed.

 

[PrinceTexasLoaf]

It either says PWM or disabled under qfan control. Maybe it thinks it's PWM? its been working fine for years now, and out of nowhere it started going full speed.

That's quite odd, have you tried resetting your bios?

 

[DROGOC0P]

That's quite odd, have you tried resetting your bios?

I set it to default, if that's what you mean. I havent taken the battery out or something like that. i would never actually modify the mobo until theres no other option

 

[PrinceTexasLoaf]

I set it to default, if that's what you mean. I havent taken the battery out or something like that. i would never actually modify the mobo until theres no other option

Hmm I'm not entirely sure what to do then.

 

[DROGOC0P]

Hmm I'm not entirely sure what to do then.

Thanks a lot man, lets hope I can fix this, i wont be calm until then. I cant thank you enough

 

[DROGOC0P]

As the title says, my CPU fan is PWM controlled by the BIOS, but it's a 3pin DC controlled fan. I can't change the option on the BIOS, could it be that the mobo doesnt support it? the fan going at full speed is driving me insane, im considering changing it or something.
FAN IS COOLER MASTER BLIZZARD T2, MOBO IS ASUS B250M-A. thanks in advance

 

[Paperdoc]

It appears your fear is correct. In your mobo manual on p. viii where it lists Internal Connectors, it says the CPU fan connector is PWM Only. That is odd now, but did show up on some earleir mobos.

 

[Paperdoc]

Duplicate post. Odd situation of 3-pin fan in mobo with PWM Mode Only on CPU_FAN header.