powerd does not control the fan. It controls the CPU frequency. Fans are usually controlled by a dedicated chip on the motherboard or the BIOS SMI code, invisible to the OS.
BTW well-tuned low-power systems without much load may just not require a fan.
I would try another fan first or the same one on a other system just to rule out a iffy fan, then I would try a fan on that board just to see if it's working, then worry about software issues.
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