Troubleshooting guide
Onan generator running but no output or breaker/load problem
Cummins Onan quick-start, service FAQ, and power-basics guidance point owners to reduce combined wattage, avoid too many appliances at once, and use normal breaker reset steps before calling for service when generator output is missing.
Use this atlas to identify likely meaning and prepare for service. Shut off power, LP gas, fuel, or water when a listed appliance condition involves flame, gas smell, exhaust, generator shutdown, high temperature, moving jacks/slides, refrigerant, 120 VAC, control boards, repeated ignition failure, or a persistent lockout. Call the appliance maker, RV dealer, or a qualified RV technician for repair.
Owner-safe checklist
- Turn off heavy appliances before retrying the generator output.
- Compare appliance running watts against the generator rating and start large loads one at a time.
- Use only the normal accessible breaker or coach controls described for the RV.
- Call a qualified technician if the breaker trips again, output does not return, or electrical burning odor is present.
Code tables for these appliances
- Cummins Onan QG gasoline generators (HGJAA, HGJAB, HGJBB) 32 codes
- Cummins Onan QG 2800i / 2500i LP inverter generators 29 codes
- Cummins Onan QG 2800 KV generators 4 codes
- Cummins Onan QG 4000 / 3600 LP generators 19 codes
- Cummins Onan QG 7000i dual-fuel inverter generators 25 codes
- Cummins Onan Quiet Diesel 5000-12500 generators 23 codes
- Cummins Onan Quiet Diesel 3200 generators 14 codes
Official sources
OnanCummins Onan RV Generator Quick Start GuideOnanCummins Onan RV Generator Parts and Maintenance SupportOnanCummins Onan RV Generator Power BasicsOnanCummins Onan RV Generator HandbookOnanCummins Onan RV QG 4000 Spec SheetOnanCummins Onan RV QG 5500 Spec SheetOnanCummins Onan RV QG 7000/6500 Spec SheetOnanCummins Commercial Mobile Onan QG 7000i DF Spec Sheet