Seems like a good start point that would prevent someone (not me) from the $754 solution. Just trying to shed some light on what worked here and I did not see much in the way of the actual root cause in the thread.
Anyway, have a good one, just trying to pay it forward, friend.
Thank you to...
Gents (and anyone else),
Cleaning and lubing the fan control switch worked for me. 15 minute time factor.
I had no action, fan or otherwise, from the fan control knob. Searching revealed this thread.
additional searching revealed the below YT video.
Disassembling and cleaning the fan switch...