Pilz 0353 is a programmable safety controller used in industrial automation to monitor and protect servo drives, motors, or machine tools. Common failure modes for this class include power supply voltage drops, isolated phase loss, over‑current on the I/O bus, or firmware mismatches between the chip card and internal memory; these conditions often trigger a “power error” status. First‑check steps: verify that the 24 V DC input is within spec and that all AC line feeds to the controller are balanced and at rated voltage; inspect the power supply module for signs of overheating or blown fuses; review the error log on the 7‑segment display or LED panel for accompanying fault codes, then confirm that the user program on the chip card matches the internal copy.[oss-gpt-20b]