Generac GP3500iO troubleshooting: 9 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Generac GP3500iO — full specs, parts & maintenance.
| Symptom | Cause | Remedy |
|---|---|---|
| Engine fires, but does not continue to run | Rotate the Off/On/Choke dial to OFF and repeat starting instructions | |
| Generator shuts down | 1. Shut off all loads and unplug electrical loads from generator panel receptacles. 2. Let engine run at no-load for several minutes to stabilize internal temperatures of engine and generator. 3. See Figure 3-2 Rotate Off/On/Choke dial to OFF (3). 4. Turn fuel cap OFF | |
| Low oil level | The engine will not run until the oil has been filled to the proper level. | |
| Overload output | Disconnect electrical loads prior to starting or stopping unit. Failure to do so could result in equipment and property damage. | |
| Engine won't start. | 1. Dial turned off. 2. Out of fuel. 3. Defective spark plug. 4. Plugged fuel filter. 5. Defective or stuck Dial assembly. 6. Incorrect engine oil level. 7. Defective ignition coil. 8. Fuel cap vent OFF. 9. Carb is flooded. 10. Throttle plate closed. | 1. Turn on Dial. 2. Fill fuel tank. 3. Replace spark plug. 4. Replace fuel and fuel filter. 5. Contact IASD. 6. Check/fill engine oil. 7. Contact IASD. 8. Turn fuel cap vent ON. 9. Drain carb. 10. Open throttle plate (push toward back of unit). |
| Engine starts, then shuts down. | 1. Out of fuel. 2. Incorrect engine oil level. 3. Contaminated fuel. 4. Defective low oil level switch. | 1. Fill fuel tank. 2. Check engine oil level. 3. Contact IASD. 4. Contact IASD. |
| Engine will not start; or starts and runs rough.* | 1. Choke is stuck or left on. 2. Dirty or clogged air filter. 3. Defective or dirty spark plug. 4. Dirty fuel filter. 5. Dirty or gummed up carburetor. 6. Unit not warmed up. 7. Spark arrestor clogged. | 1. Turn choke off. 2. Clean or replace air filter. 3. Replace spark plug. 4. Replace fuel and fuel filter. 5. Clean carburetor. 6. Gradually adjust Dial and reduce choke until engine runs smoothly in RUN position. 7. Clean spark arrestor. |
| No AC output. | 1. Generator is overloaded. 2. Inverter module is overheated. 3. Short circuit in electrical device. 4. Defective inverter assembly. | 1. Disconnect all loads. Shut down generator to reset module. Reduce loads, restart generator. 2. Verify service door is ON. Let cool 15 minutes by running engine without AC output. Press and hold Reset button on control panel, restart generator. 3. Verify condition of extension cords and items being powered. Press and hold Reset button on control panel. 4. Contact IASD. |
| Fuel leaks from drain hoses. | 1. Carburetor drain in bowl is not closed. | 1. Turn valve clockwise to close. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: 1. Dial turned off. 2. Out of fuel. 3. Defective spark plug. 4. Plugged fuel filter. 5. Defective or stuck Dial assembly. 6. Incorrect engine oil level. 7. Defective ignition coil. 8. Fuel cap vent OFF. 9. Carb is flooded. 10. Throttle plate closed.. See the table for the matching fixes.
Documented causes: 1. Out of fuel. 2. Incorrect engine oil level. 3. Contaminated fuel. 4. Defective low oil level switch.. See the table for the matching fixes.
Documented causes: 1. Choke is stuck or left on. 2. Dirty or clogged air filter. 3. Defective or dirty spark plug. 4. Dirty fuel filter. 5. Dirty or gummed up carburetor. 6. Unit not warmed up. 7. Spark arrestor clogged.. See the table for the matching fixes.