25 Brake Abnormality: The most common issue here is that the brake sensor is activated before you turn the power pack on. Fix this by pressing on the brakes once. If that doesn't work, turn on the power pack before connecting it to the bike. If this occurs frequently try adjusting the slack in your brake cable to allow the cable to move further with each press. Alternatively you can try replacing your brake cable with a new one to improve the performance and fit of the sensor.
The brake sensor light will indicate when it is on:
30 Communication Abnormality: This is most commonly caused by a connection problem between the controller and the display. To fix this check the white connector inside the power pack is fully connected. Also check that the contact pins are straight and uniform.