Before you do this make sure you have the threshold for FANA set properly. Here's the raw commands you can test. Just stop the fancontrol service first. Run this first to get the readings ipmisensors -t fan Then run this to change the fan setting for FANA to full speed ipmi-raw 00 30 70 66 01 01 64 Run this to get the reading maybe even a couple times to check ipmisensors -t fan Then change the fan speed like this and check the reading again with ipmisensors ipmi-raw 00 30 70 66 01 01 34 Let me know what you find out. You can also use this to check FAN1234 ipmi-raw 00 30 70 66 01 00 64 If none of this works, double check bios and bmc are up to date. Try switching fan headers. Not that it matters but all Supermicro boards I have had say to put CPU on fan1 and FANA is for peripherals. So I always have CPU on fan header 1 and case fans on 2, 3, 4 then 2 fans with a splitter (pwm only goes to one fan) on FANA for my hard drives.