Cerberus Pyrotronics 94V‑0 4097 is a flame‑retardant PCB used as the central processing unit in industrial fire‑alarm control panels, handling communication between detectors, annunciators and the main panel. Common failure modes include power‑supply dropout or voltage ripple, relay contact wear on alarm output circuits, firmware corruption from power interruptions, and broken sensor‑line connections due to corrosion or mechanical stress. First‑check diagnostics: verify 24 VDC input stability with an oscilloscope; inspect all relay contacts for pitting or oxide build‑up; perform a visual inspection of solder joints and trace continuity on the fire‑alarm interface sections; review any stored error codes in the panel’s diagnostic log.[oss-gpt-20b]