CIAR SpA SU15/M1 2151100695 is a dual‑input (120 V/230 V) power supply unit used in recliner control boxes and other industrial automation circuits. Common failure modes for this class of supplies include overheating of the internal rectifier bridge, degradation or rupture of electrolytic capacitors on the output side, and failure of switching MOSFETs due to over‑current or voltage spikes. First‑check diagnostics should verify that the input voltage is within spec on both 120 V and 230 V rails, inspect the supply for visible signs of overheating or component damage, and test the output voltage and ripple with a multimeter and oscilloscope before proceeding to internal board inspection.[oss-gpt-20b]