Radrover Error Codes from my 2016 manual:
21: Abnormal Current - Check to see if all plugs are connected properly or have been damaged.
22: Throttle Fault – This error is often a result of holding down the thumb throttle while turning the E-bike on.
23: Motor Phase Problem – This error is often a result of a connection error between the plug and motor. Check to see if all plugs are connected properly or have been damaged.
24: Motor Hall Defect – This error is often a result of a connection error between the motor and controller. Check to see if all plugs are connected properly or have been damaged.
25: Brake Failed Or Brake Applied While Turning On – This error is often a result of holding down the brake handle while turning the E-bike on.
30: Abnormal Communication – This error is often a result of a connection error between the display and the controller. Check to see if all plugs are connected properly or have been damaged.