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The screen shots show the behaviour of the system as it approaches set point temperature 0C (500mV) in auto. In this case at ~1Hz.
From the left - the pulse width diminishes getting close to set point, within set point +0.1C. At set point the pulse width further decreases to a lower duty cycle and at -0.1C duty cycle = 0.
Typically, the system will modulate either side of set point.
The second image shows the same behaviour with 50% duty cycle set by the PWM pot in auto.
Fan control at 25kHz is best operated in manual mode.
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