Dutch Bike For Sale Factory introduces the reasons why the electric bicycle cannot be started:

1. The detection method is to disconnect the plug of the controller regulator (three-wire plugs 7, 8, 9), which can immediately identify the fault of the speed control handle or the controller.

2. If the car does not turn after turning on the electric door lock after disconnecting the plug of the speed control knob, it is judged that the speed control knob is broken, and the new optical disc should be replaced, reinstalled, and repaired.

3. If you disconnect the speed control knob and turn on the electric door lock and the car is still running, it is judged that the controller is broken, and you should replace it with a new one at this time.