The only thing I will have to check is I can not recall if it was requesting a temperature change in that instance or if the sensor was already cooled to the target. I will have a play at home tonight and explicitly try it when the sensor is at the setpoint and again when it is a few degrees warmer to isolate if it is the cooling assistant effectively not starting, or if it finishes silently in the case of setting 0 degree steps.
I was trying to use 0 degree step setting to let the driver run the show as if the steps are small the cooling power is very slow to change and the cooling aid tends to time out. If the driver only allows for APT or other programs to command a setpoint and the driver looks after the power level I might as well set at least 5 degree steps to make the driver react a little more aggressively.
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