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When you first purchase your new wheelchair, become familiar with it so that when changes occur, you can easily spot them. For a rundown of easy wheelchair problems you can check yourself, take a look at this list.
Also, be very familiar with the owner's manual for your power wheelchair. It should contain a fault code list that coincides with the lights on your joystick. For example, if you have and Invacare Arrow Storm with Mark IV electronics and your chair suddenly stops and your joystick is flashing 3 bars on your battery gauge, if you look in your owner's manual, you'll see that a 3-bar flash indicates a motor fault which can be caused by one of your motor brake levers disengaged, or a melted motor plug.