We need a little more information and clarity.
Are you saying that the Touch Display is not working / responsind and the multiplex switched are not responding as well? Or are only the multiplex switches not responding?
If it is just the switches, there is a pairing procedure you can try. If the Touch Display is not responding, you should try rebooting the system by cutrting the 12V power in one of two ways:
1) If not on shore power - Put the Use / Store switch in the Store position and wait about a minute. This will cut the 12V power and allow the display and the control board to power down. Then put the Use / Store back in the Use position to bring the system back up and see what happens.
2) If on shore power - Turn the breaker for the Converter off. Then put the Use / Store switch in the Store position and wait about a minute. Then put the Use / Store back in the Use position to bring the system back up and turn the Converter breaker back on and see what happens.