I was able to set mine to 1 two years ago and they’ve been running ever since unless the power cord to the controller is accidentally pulled out. Put the power cord back in and it has kept the same settings. In my experience with the T series settings they go (a good) crazy outside the set perimeters, Lol!
I found this link that explains it.
Basically unplug the sensor, set the fan speed you want for minimum, go into mode, setup the parameters, press auto when set, get out of mode, then plug in the sensor again.
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