CICS action on return from the control program

When CICS® receives control back from the autoinstall control program, it examines the return code field:

If the return code is zero, and the other required information supplied is satisfactory, CICS schedules the transaction specified on the MODIFY command to complete the request. If the installation process fails, the autoinstall control program is driven again, as though a DELETE function is being processed.
If the return code is not zero, CICS rejects the connection request in the same way that it rejects an attempt by an unknown console to send a modify request to CICS when autoinstall is not enabled.

For all autoinstall activity, messages are written to the transient data destination CADL. If an INSTALL fails, a message is sent to CADL, with a reason code. You can check the output from CADL to find out why an autoinstall request failed.