Yellow or Red, when battery fully charged
The low battery indication (YELLOW and RED) can also occur if the motors become disconnected from the Motor Controller. If the charge indicates GREEN, but the throttle indicates YELLOW or RED, check for a broken or loose connection.
All three indicator lights on
If the PIC microprocessor crashes, three Speed Controller lights (green, yellow, and red) will be illuminated. If this occurs, stop riding immediately, and turn the motorboard OFF, wait five seconds and then turn it ON. If the problem persists, the Motor Controller needs to be repaired or replaced.
Due to small electrical leakage, the red light can glow slightly when riding, even when the green indicator light is illumintated. It is usually noticed at twilight or in low-light conditions.