App not changing fan speeds

[BradTheGeek]

First, thanks for a great product. I have used it once before when replacing a drive in an iMac so that I could base fan speeds off of SMART temp instead of the SMC not seeing the new drives temp via firmware (since this drive did not have the requisite firmware).

I am currently working on a 24" iMac with a very hot PSU. The owner does not want to replace the PSU, but the heat is causing some problems (HDD @50C, which had one HDD fail, occasional freezes). He may replace the mac, but I told him I could boost the fan speeds manually and it may help a little until then. I have tried this app and SMC fan control, but no matter the settings, the fan speeds stay locked at around 1500 RPM. I have tried manual set and automatic based off of various sensors with no luck.

Does anyone know why it will not control the fans? I have reset the SMC, OS is Mavericks.

Thanks!

[Steven]

http://forums.crystalidea.com/viewtopic.php?f=11&t=1006

[BradTheGeek]

Due to connectivity issues, I had to sneakernet that stuff. Sorry I did not have it at first.

Tech info:
Macs Fan Control 1.1.12.2, iMac8,1, Mac OS X 10.9

Fans:
ODD-min{1500}curr{1496}max{4800}mode{1,4800}
HDD-min{1500}curr{1498}max{5900}mode{1,5900}
CPU-min{1200}curr{1197}max{3600}mode{2,TC0H,36,46}


TempSensors:
TA0P (Ambient) - 24.125
TC0D (CPU Diode) - 38.75
TC0H (CPU Heatsink) - 41.375
TC0P (CPU Proximity) - 42
TG0D (GPU Diode) - 54.25
TG0H (GPU Heatsink) - 50.25
TG0P () - 52
TH0P () - 49.25
TL0P (LCD proximity) - 50.207
TO0P (Optical Drive) - 40.625
TW0P (Airport Card) - 42
Tm0P (Mem Controller) - 45.125
Tp0P () - 73.8438

[Steven]

What if you set all to auto and try to run some 3D game to warm it up?
Do all fan remain at minimum speed?

[BradTheGeek]

I have stressed both the CPU and GPU and the fans stay rock steady at Minimum

[Steven]

It doesn't sound good, something is not working properly

[BertholdBarz]

I have the same issue, same model iMac, also running Yosemite. Same version ran fine on Mountain Lion (I booted into a clone last night to see if it still worked and it did).

[Steven]

BertholdBarz
Thanks for the information. I wish I has the same iMac to reproduce the issue. Is there anything in Console?