Segway PT x2 Reference Manual page 50

Red Balance Indicator lights indicate that the Powerbase or
LeanSteer Frame are tilted, and the Segway PT is not ready to be
stepped on:
One red left or right Balance Indicator light.
Pivot the LeanSteer Frame in the opposite direction of the red
light, until the LeanSteer Frame is vertical, and the red Balance
Indicator lights are replaced by one green Balance Indicator light
in the center.
One red front or rear Balance Indicator light.
Tilt the Powerbase in the opposite direction of the red light, until
the Powerbase is level, and the red Balance Indicator lights are
replaced by one green Balance Indicator light in the center.
Two adjacent red Balance Indicator lights.
Move both the LeanSteer Frame and the Powerbase in the
opposite direction of the lights until the red Balance Indicator
lights are replaced by one green Balance Indicator light in the
center.
Five red Balance Indicator lights.
Pivot the LeanSteer Frame until it is vertical, level the
Powerbase, make sure the Wheels are not moving, and wait until
the red Balance Indicator lights are replaced by one green
Balance Indicator light in the center.
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