The Datronics Model 8000 Gas Controller (part 226650‑001) is an eight‑channel analog gas detection controller that accepts 12 V AC or 24 V DC input and drives indicator lamps or relays based on sensor thresholds. Common failure points for this class of controllers include burned‑out power supply components, degraded relay contacts, and damaged signal conditioning ICs; intermittent operation often stems from loose wiring or corrosion at the sensor connectors. Initial troubleshooting should verify that the 12 V/24 V input is within spec, inspect all I/O terminals for continuity and physical damage, and review any stored error codes or status LEDs on the front panel before proceeding to board‑level diagnostics.[oss-gpt-20b]