1、When the UAV takes off, if there is tendency of roll but it does not affect the flight. Please check the level of the motor arm. This problem is mostly caused by the low level of the motor arm.

2、If pump does not work, first confirm whether the pump problem or power supply problem, if pump problem ,please replacement pump, if power supply problem, please contact our after-sales.

3、If the sprayer is abnormal, please check whether the sprayer is blocked . If the sprayer is not blocked and the pipe is not folded, check the pressure of the pump. (Because of the rapid precipitation of the liquid, the liquid should be prepared not more than half a day consumption to avoid blocked by the liquid precipitation.)