Onan generator exhaust smell, CO detector, or ventilation shutdown
Cummins Onan quick-start and handbook safety guidance treat carbon monoxide, exhaust leaks, blocked airflow, and unsafe ventilation as shut-down conditions that belong with qualified generator service.
Owner-safe checklist
- Shut the generator down immediately if a CO detector alarms, exhaust odor enters the RV, or exhaust damage is visible.
- Move people to fresh air and do not sleep with the generator running in unsafe ventilation conditions.
- Look only for obvious external blockage around the generator intake or exhaust outlet from safe ground access.
- Call qualified generator service before running again if any exhaust leak, CO detector event, soot, or ventilation concern remains.