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Predator 3500 Watt Super Quiet Inverter / 9500 Watt Super Quiet Inverter / 2500 Watt Super Quiet Inverter / 4200 Watt Dual-Fuel Super Quiet Inverter error codes
10 codes from the official Predator manual (2500 Watt Inverter Generator (72010)), each with the manual page. For 2 of them the manual says to contact an authorized service dealer.
Applies to: Predator 3500 Watt Super Quiet Inverter, Predator 9500 Watt Super Quiet Inverter, Predator 2500 Watt Super Quiet Inverter, Predator 4200 Watt Dual-Fuel Super Quiet Inverter, Predator 5000 Watt Portable Generator (72613), Predator 1400 Watt Super Quiet Inverter with CO Secure.
| Code | What it means | What to do | Service | Manual |
|---|---|---|---|---|
| FLASHING RED LIGHT Carbon monoxide shutoff | Dangerous levels of carbon monoxide gas have built up and the generator shuts off. | Leave the area immediately until it has aired out. Move the generator to a well-ventilated area before operating it again. | owner | p. 5 |
| FLASHING YELLOW LIGHT Carbon monoxide sensor malfunction | The carbon monoxide sensor is malfunctioning and needs service. The generator should not be used until the sensor works properly. | Do not use the generator until the sensor is working properly. Call Harbor Freight technical support at 1-888-830-0321. Only a qualified technician may service the CO sensor. Do not modify or tamper with it. | dealer | p. 5 |
| LOW OIL Low Oil | The engine shuts off if the engine oil level is too low. The engine will not start with low or no engine oil. | Stop the engine and make sure the generator is level. Check the dipstick oil level and add the appropriate oil until it reaches the proper level. SAE 10W-30 is recommended for general use. Reinstall the dipstick and access panel. | owner | p. 11 |
| OVERLOAD Overload | The OVERLOAD light turns on and the generator stops producing power when the total connected load exceeds the unit's running power. | Disconnect all electrical devices and compare their requirements to the generator rating. Move anything blocking generator ventilation. Press the Overload Reset button below the 120VAC receptacle so the OVERLOAD light turns off. Reconnect devices carefully, without overloading the generator. | owner | p. 15 |
| Carbon Monoxide level high Overload | The generator is overloaded, so the attached device has no power or the rated load capacity has been exceeded. | Turn off and unplug the device(s), press the circuit overload reset button, then plug the device(s) back in and turn on. Reduce the number of items plugged in or use a more powerful generator. | owner | p. 19 |
| CO Sensor Alarm Carbon monoxide level high (CO Sensor Alarm) | Carbon monoxide level is high. The red CO sensor light illuminates, and the yellow CO Sensor Alarm may flash continually shortly after starting or after longer operation. The engine stops suddenly. | Leave the area immediately and ventilate thoroughly. Operate the generator only outdoors, keep at least 5 ft clearance on all sides, and stay within the rated ambient temperature. If the sensor needs service, call 1-800-444-3353 as soon as possible and do not use the generator until the sensor works properly. | dealer | p. 24 |
| Circuit Breaker tripped | A circuit breaker has tripped, so the attached device does not have power. | Turn off and unplug the device, reset the Circuit Breaker, then plug the device back in and turn it on. | owner | p. 24 |
| Low oil shutdown | Engine oil is low, or the engine is mounted on a slope, which triggers low oil shutdown. The engine will not start with low or no engine oil. | Fill engine oil to the proper level and check the oil before every use. Operate the engine on a level surface and check the oil level. | owner | p. 24 |
| Overload Inverter module overloaded | The inverter module is overloaded, so the attached device does not have power. | Press the Overload Reset button located below the 120VAC receptacle. If the problem continues, lower the number of items plugged into the generator to stay within the rated capacity. | owner | p. 24 |
| Red light on Carbon Monoxide Sensor Carbon Monoxide level high | Carbon monoxide level is high and the engine stops suddenly. The red light on the CO sensor illuminates. | Leave the area immediately and allow it to ventilate thoroughly. Only operate the generator outside. | owner | p. 24 |
Source: official Predator 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.