What to do if my EBike reverse don't work?

1. TURN ON THE UNIT THEN PRESS THE SWITCH TO REVERSE

2. SLOWLY TURN THE TROTTLE AND CHECK IF IT WILL MOVE REVERSE

D - FORWARD O - FORWARD

R - BACKWARD -   - BACKWARD

3.IF STILL NOT WORKING CALL FOR HOME SERVICE OR VISIT NEAREST BRANCH

4.POSSIBLE PROBLEM COMBINATION SWITCH