The CIAR SpA SU15/M1 is a 230 V/IT2‑P power supply used in lift and recliner control boxes, providing a regulated 15 V output at up to 4.2 A (≈110 W). Common failure modes include degraded electrolytic capacitors on the input or output side, transformer winding insulation breakdown leading to shorted secondary windings, and overheating of the internal switching regulator causing thermal shutdowns. First‑check diagnostics: verify that the unit receives correct 230 V AC with a multimeter; inspect all capacitors for bulging or leakage and measure ESR; check for visible signs of burnt components or melted insulation on the transformer core and regulator IC; finally, test the output voltage under no load and with a dummy load to confirm regulation and continuity of the output leads.[oss-gpt-20b]