The Lincoln Commander 400 is a standby power controller used on 240‑V/3‑wire industrial welding and cutting equipment, typically paired with the SVM133‑B or G2713‑1 control board. Common failure points for this class of controllers include tripped over‑current protection relays, burnt-out MOSFETs or IGBT modules in the power stage, and degraded capacitors on the high‑voltage supply rail; a faulty phase‑sense transformer can also trigger false shutdowns. First‑check diagnostics: verify that the 240‑V input is clean and within spec, inspect the board for visible burn marks or swollen electrolytics, and review any error codes logged in the controller’s diagnostic memory before proceeding to component testing.[oss-gpt-20b]