error but no error on cpu fan?

[adolf hamster]

installed an alpenfohn k2 few days back, used corsair sp120's with pwm as opposed to the vanilla fans.

went to boot up today and got 'cpu fan error' message from the bios. thing is both cables are seated and both fans are spinning fine, ergo no error?

one fan is in the socket marked CPU_FAN and the other is in CPU_OPT

anyone care to shine a light on what's going on? if I deliberately bypass the message computer starts up and runs fine [i'm using it atm]


computer specs:
psu= corsair gs700
mobo= asus sabertooth 990fx [gen 1]
cpu= fx8150 @stock

 

[adolf hamster]

just got back from tech, no error this time. if it happens again i'll take another look. the only thing I can think is possibly it's not getting feedback for the fan rpm? would explain why It thinks there's something wrong when there isn't

edit: warning threshold for temps or rpm? i'll take a look

 

[adolf hamster]

tried changing the threshold, didn't help it. got the warning again went straight to the bios and the fans are reading anywhere from 0-6300 ish rpm, so it does seem to be that. disabled q fan control and set it to ignore the temps. its running full bore all the time now but tbh I can deal with that. its quiet enough