well with that display it should show you the error code in such a way -02, if that is the code it is saying the forward directional switch is closed on initial startup.

But if this truck uses the monotrol pedal it defaults to forward drive anyway so that may be normal. If it has a hand selector for the directional control then it may be in a selected direction or the switch may be stuck or have a faulty switch.

As for the 'water drop' as you put it that is a drop within a circle with brackets around the circle? This is brake fluid, indicating the brake fluid is low, if the fluid is not low then the float inside the reservoir may be stuck or faulty.

since it drives but the lift does not work what is the charge level of the battery? generally the battery symbol on the dash would illuminate if the battery is low which would place the unit in battery cut out mode but if it is not lit that may not be the case but i would check the battery anyway if the level shows towards the low end of the gauge.