exapplerep
commented
4 years ago 
Turned on logging. Restarted. Was not logged into Win10 account. Heard the fan ramp up. Logged in and launched MFC. Saw the Assertion Failed dialog (attached). Setup auto-login so the machine would not sit at the Win10 login screen—I know this is a problem in macOS; the user must be logged in for MFC to actually work—and then restarted. The machine logged into my account automatically. Waiting to see if the HDD fan begins ramping up again.
Here's the log file that MFC collected:
Macs Fan Control 1.4.12
iMac11,3
CPU: Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz [100]
GPU: AMD Mobility Radeon HD 5000
Windows 10 x64
Fans: ODD-min{1000}curr{999}max{3800}mode{2,TG0H,46,57} HDD-min{1100}curr{1240}max{5500}mode{2,PNY CS900 480GB SSD,42,52} CPU-min{940}curr{939}max{2100}mode{2,TC0H,52,63}
TempSensors: TA0P () - 21.0859, 21.0859 TA0V () - 20.9297, 20.9297 TA0p (Ambient) - 26.375, 26.375 TA1v () - 25.8984, 25.8984 TC0C (CPU Core 1) - 36.6719, 36.6719 TC0D () - 129, 129 TC0H (CPU Heatsink) - 38.625, 38.625 TC0P () - 129, 129 TC1C (CPU Core 2) - 46, 46 TG0D (GPU Diode) - 44, 44 TG0H (GPU Heatsink) - 40.375, 40.375 TG0p (GPU Proximity) - 42, 42 TH0O () - 9, 9 TH1O () - 9, 9 TL0P () - 26.0039, 26.0039 TL0V () - 31.0547, 31.0547 TL0p (LCD proximity) - 39.5, 39.5 TL1V () - 31.543, 31.543 TL2V () - 33.7812, 33.7812 TLAV () - 33.7812, 33.7812 TLBV () - 31.1445, 31.1445 TLCV () - 31.0586, 31.0586 TMCD () - 48, 48 TO0P () - 33.25, 33.25 TO0p (Optical Drive) - 34.125, 34.125 TPCD (Platform Controller Hub Die) - 59, 59 TS0V () - 36.7109, 36.7109 TS2P () - 33.875, 33.875 TS2V () - 32.1289, 32.1289 TS2p () - 33.875, 33.875 Tm0P () - 40.125, 40.125 Tm0p () - 40.125, 40.125 Tp1P () - 46.5, 46.5 Tp2H () - 58, 58 Tp3H (PSU Primary) - 47.25, 47.25
Disk drives: PNY CS900 480GB SSD - 33
Machine: iMac11,3 OS: Windows 10 Latest version of MFC as of 8/22/19
Installed MFC as directed. Set it to auto-launch upon login. All three fans are being controlled using "custom" settings (to keep the iMac a bit cooler). The HD fan -has- to be "custom" as it's a third-party 2.5" SSD (and this is one of those Macs that had a HD that used that stupid signal cable). On the Mac side, MFC works perfectly. But, on the Windows side, some minutes after the screen goes dark, I can hear the HD fan ramp up as if it's no longer being controlled. When I open MFC's control window, I can see the HD fan at around 5900 rpm but, within a few seconds, it falls to proper rpm. (I'll note that MFC appears in Task Manager even before I open its control window.)