The Lust Electronic Systeme FU‑314 S is a compact servo drive/control unit used in industrial motion systems. Common failure modes for this class include power supply degradation (brownouts or ripple), motor coil overheating or shorting, I/O communication faults, and firmware corruption that can trigger error codes such as “E100” or “E200.” Initial checks should verify the 24 V DC input voltage and current rating, inspect all connectors and solder joints for cracks or burn marks, and review the drive’s diagnostic register or display for stored fault codes. If power is stable and no obvious physical damage is found, test the I/O ports with a multimeter and confirm that the motor encoder signals are clean before proceeding to firmware re‑flash or component replacement.[oss-gpt-20b]