Hello everyone. I have a problem in my Saratoga the autopilot does not respond when i am selecting the VS function (i put any positive or negative value but not working sometimes i cannot put any value at all) , while the HDG switch seems to work normally. I did not have this problem in the beginning, after 3-4 flights i am unable to control the trim through the autopilot. Any help appreciated.

Not sure if anyone has also had issues with this feature but I can vouch for a work-around in P3Dv4.3

With the aircraft in manual climb engage AP and ALT function at a safe altitude.

Turn your attention to the other AP gauges to the left of the comm panel.

Click on ALT on the right side one and then you can change the value up or down as desired using the knob on that gauge. The aircraft will respond.

To change VS click on the VS button and change the VS value to suit.