The JLG Smart Systems AU3019 (model 1600289) is a programmable industrial controller used in automated warehouse and material‑handling systems. Common failures include power supply dropout, LED fault indicator flashing due to shorted I/O lines or overcurrent protection trips, and firmware corruption that can lock the unit into an error state; these are often accompanied by stored fault codes retrievable via the built‑in diagnostic interface. For first‑check diagnostics verify the 48 V DC input is within spec, inspect all connected I/O modules for visible damage or loose connections, and read the controller’s fault log through its serial/USB console to identify specific error conditions.[oss-gpt-20b]