The ClimateMaster Configuration Diagnostic Tool (ACDU03) is an essential device utilized by technicians for electronic configuration and diagnostics of ClimateMaster units. Connected via a 4-wire connector to the DXM2 board, this tool enables precise configuration of airflow, heat pump options, modulating valve operation, and other unit settings. It facilitates both automated and manual operation for diagnostic purposes, allowing technicians to view and diagnose fault history, operating conditions during faults, and control settings effortlessly.