Trying to run Autotune in my APM 2.0 but coming up against a strange problem. When I switch from manual control to autotune, the plane will not climb. I try to do the climbing and diving as instructed but it only dives. Pulling back on the stick maintains level flight only.
It rolls left and right OK.
My trim in manual flight is marginal, and there is some sub-trim for the servos but not much. The plane has been calibrated level.