In most cases, the LEGO EV3 program does exactly what you have programmed it to do. If you are having trouble, follow these troubleshooting steps:......
(This information refers to the LEGO NXT robotics system. The information should be similar for LEGO EV3. However, this has not been tested.) There is......
Specifications and User Guide TROUBLESHOOTING – Primary Test: Press the power button on the sensor to turn it on. (The red LED will be flashing.)......