E1: A moving erroe of X-axis
E2: A moving erroe of Y-axis
E3: A moving erroe of Z-axis
If above error indication appeared, it is a movement error of X, Y, Z-axis.
Push Power ON switch (POWER ON) once more and plug in and please repair a power supplu after power OFF switch (POWER OFF) is pushed and a power supply is turned off at once.