Generac 3300i error codes
1 codes from the official Generac manual (GP3300i Series Portable Generator), each with the manual page.
Applies to: Generac 3300i.
| Code | What it means | What to do | Service | Manual |
|---|---|---|---|---|
| Blinking RED light COsense CO shut-off | The generator shut off because carbon monoxide is accumulating from the exhaust. The red light in the COsense badge blinks for at least five minutes after the shut-off. | Move the generator to an open outdoor area and point the exhaust away from people and occupied buildings. Once it is in a safe area, it can be restarted and connected. Ventilate the location where it shut down. | owner | p. 11 |
Source: official Generac manual, read 2026-11-02. "Owner" means the manual lists steps you can take; "dealer" means it directs you to authorized service. Fuel, gas and electrical work on generators is for qualified technicians; follow the manual's safety section.