By default and without any intervention, the most upstream zone will never turn on to accept new product. To cause the most upstream zone to run to accept an item with a wired signal, you need to utilize the Aux I/O Pin 2 for the upstream zone as a Wake-up input.

Assuming the most upstream zone is connected to the left side of the module; we set the Left Pin 2 to Wake up from the drop-down box and make sure we click the UP arrow to indicate that the Left Pin 2 signal is to be associated with the Upstream Zone. When the Left Pin 2 signal is energized, the upstream zone will run to accept an item