CPU fan doesn't follow the MFC instruction

[Vincent]

Hi,

I use a early 2009 iMac on El Capitan and I recently changed the HDD for a SSD. I installed MFC to control the fan. It worked well during few days.

But, now the CPU fan is now running at 4000RPM while the instruction is 1600!

Do you have an idea ?

[Vincent]

Macs Fan Control 1.4.3
iMac9,1
CPU: Intel(R) Core(TM)2 Duo CPU E8335 @ 2.93GHz [100]
GPU: NVIDIA GeForce GT 120
Mac OS X 10.11.6

Fans:
ODD-min{800}curr{799}max{4800}mode{0}
HDD-min{1600}curr{1599}max{5900}mode{0}
CPU-min{1200}curr{4011}max{3600}mode{1,1200}


TempSensors:
TA0P (Ambient) - 21.25, 21.25
TC0D (CPU Diode) - 32.25, 32.25
TC0H (CPU Heatsink) - 31.875, 31.875
TC0P (CPU Proximity) - 36, 36
TG0D (GPU Diode) - 42.5, 42.5
TG0H (GPU Heatsink) - 34.5, 34.5
TG0P () - -1, 129
TH0P (HDD Proximity) - 38.75, 38.75
TL0P () - -1, 128
TN0D (Northbridge Diode) - 55.5742, 55.5742
TN0H (Northbridge heatsink ) - 51.875, 51.875
TN0P (MCP Proximity) - 41, 41
TO0P (Optical Drive) - 34.5, 34.5
Tm0P (MLB Proximity) - 34.25, 34.25
Tp0P (Power Supply Proximity) - 30.0469, 30.0469


Disk drives:
CT960BX200SSD1 - 35

[Steven]

Vincent
Try to reset SMC

[Vincent]

I did. In completely uninstalled MFC. I reboot the iMac and then reinstalled MFC. CPU fan is still at 4004 although set at 1200.

[Steven]

Vincent
Try to run the apple hardware test
https://support.apple.com/en-us/HT201257