a. Power machine off & on, and try again.
b. Slice the current model and print it again. Could be something wrong with the G-code file. c. Check all the cable connections in relay board. Figure 38-1
d. Check cable connections in main board (J8, J29)
e. Upgrade the SW & FW to latest version
f. Replace the relay board
g. Replace the touch screen
h. Replace the UI SW board