The motor rotates and stops. 

1 Insufficient battery power: charge the battery;

2 Poor contact of battery contacts: adjust the position of the contacts or grind the contacts;

3 Poor contact between the fuse and the fuse seat in the battery box: adjust or replace to make it good;

4 Speed control handle There is dirt in the photosensitive tube of the inner photosensitive film: clean or replace the photosensitive film, wipe the photosensitive tube, but still can't solve the fault: replace the speed control handle;

5 There is a fault in the controller: replace or repair the controller;

6 The lead wire of the speed control handle seems to be broken Broken: replace or repair the lead;

7 Brake power-off switch failure: adjust or replace the brake power-off switch;

8 Poor contact after ablation of the power lock: replace or repair the power lock; 

9 Line internal connector virtual connection: re-plug, Make it in good contact;

10 The carbon brushes, wires, windings in the motor are soldered and connected: repair or replace the motor.