Here is an excerpt from the owner manual:
"Testing Shore AC Present
This test verifies that the EC-30 can sense when AC
power is available from the utility grid. Before starting
this test be sure that the Shore AC is disconnected.
Turn off the AC breaker at its supply or unplug the
vehicle or trailer from the AC grid system. Do not do
this test with the genset running. Navigate to the
Shore AC Present display and press ENTER. The
display will say Turn On Shore AC. Now plug the
shore AC back in or turn the breaker on. The display
will change to read AC Ok ENTER. Press ENTER to
exit the test."
You can do this to determine if you have the option installed