Error code: E086 & E40F meaning: error in propulsion subsystem.
Tip: This is when your segway will Boot but shut off when balance mode is selected(i.e when you step on it)
Try Setting your Segway to Lock mode, Now push the segway in lock mode as its bleeping for 10 meters forward then back.
Next Error E04F
Restart segway as could be a relay stuck in one of the motors. This quick fix worked after one segway had a bad tumble.
E047 Back of motor solder come lose!