Jensen CT3168 (model 51.3168.51) is a 16‑channel AC output module used in industrial drive and machine‑control systems. Common failure modes on this class of modules include insulation degradation between phase conductors, contact wear or pitting on the output terminals, and overheating due to overcurrent or shorted loads; these can manifest as intermittent output loss or erratic error codes from the host PLC. First‑check diagnostics should verify that the module receives its rated supply voltage (typically 24 V DC for control logic) and that no overcurrent protection devices are tripping, then visually inspect the output contacts for corrosion or pitting, followed by a continuity test of each channel against the expected load path and review of any diagnostic logs from the controller.[oss-gpt-20b]