Firman WH03242 / T09371 / H07553 / W03083 error codes
13 codes from the official Firman manual (WT03571 Tri Fuel Inverter Generator), each with the manual page. For 3 of them the manual says to contact an authorized service dealer.
Applies to: Firman WH03242, Firman T09371, Firman H07553, Firman W03083, Firman W01781, Firman WH03342, Firman T08072, Firman W03382, Firman WH03562OF, Firman WH03042, Firman WH03344, Firman WT06073, Firman W03386, Firman H08052, Firman WT06375, Firman WT03571, Firman W03663OF, Firman T09376, Firman H03654, Firman W02081, Firman P09305, Firman T08273, Firman T04472, Firman W01682, Firman H03655, Firman P03632, Firman W01785, Firman P08013, Firman W01687, Firman P03504, Firman W01782, Firman P06702, Firman W01783.
| Code | What it means | What to do | Service | Manual |
|---|---|---|---|---|
| Circuit Breakers Circuit Breakers (circuit protector trip) | The receptacles are protected by an AC circuit protector that trips if the generator is overloaded or an external short circuit occurs. | Disconnect all electrical loads and determine the cause before using the generator again. If overloading caused the trip, reduce the load. Reset by pressing the protector button. Continuous tripping may damage the generator or equipment. | owner | p. 8 |
| Oil Warning Indicator Light | Indicates the oil has fallen below the minimum level. The engine stops automatically and will not start until the proper amount of oil is in the crankcase. | Check the oil level when this light turns on. Add the proper amount of engine oil to the crankcase before attempting to start the engine. | owner | p. 8 |
| Overload Indicator Light Overload | Connected devices have exceeded the generator's wattage or amperage capacity, or a power surge occurred. The AC Power light goes off, the engine keeps running, and power to the receptacles is cut. | Keep the total power drawn from all receptacles within the nameplate rating. | owner | p. 8 |
| Circuit Breaker AC Circuit Breakers | The receptacles are protected by an AC circuit protector that trips if the generator is overloaded or an external short circuit occurs. | Disconnect all electrical loads and find the cause before using the generator again. If overloading caused the trip, reduce the load. Reset by pressing the button on the protector. Continuous tripping may damage the generator or equipment. | owner | p. 9 |
| Output Ready Output Ready Indicator Light | Stays on during normal operation. Turns off when the generator is overloaded. | See the manual. | owner | p. 9 |
| AC Reset AC Reset Button | The inverter has entered a protective state and AC output is interrupted. | Press the AC Reset Button to restore the output. | owner | p. 12 |
| Oil Warning Oil Warning Indicator Light | Oil has fallen below the minimum level. The engine stops automatically and will not start until the crankcase contains the proper amount of oil. | Check the oil level and fill the crankcase to the proper level before restarting. Place the generator on a level surface when checking the oil. | owner | p. 12 |
| Overload Overload Indicator Light (Engine Overload Indicator Light) | Lights when connected devices exceed the generator's wattage or amperage capacity. The green AC Power light goes off and power to the receptacles is cut, but the engine keeps running. | Reduce the connected load. The manual directs you to its 'Don't Overload Generator' guidance. | owner | p. 12 |
| CO Alert CO Alert Shutdown (Red Indicator) | Red light means the engine shut down because carbon monoxide accumulated around the generator. The light blinks for at least five minutes after shutdown. Automatic shutoff indicates the generator was improperly located. | Before restarting, move the generator to an open outdoor area downwind and at least 20 ft (6 m) from occupied spaces, with exhaust pointed away. Air out the premises. If you feel sick or dizzy, get to fresh air and call emergency services. | owner | p. 20 |
| CO Alert fault CO Alert fault occurred | A fault occurred in the CO Alert carbon monoxide shutdown system, which shuts down the engine. The yellow CO Alert indicator light blinks for at least five minutes after shutdown. | See FIRMAN authorized service dealer. | dealer | p. 28 |
| CO system fault Engine shuts down with yellow CO fault light blinking | The engine shuts down and the yellow CO fault light blinks. The cause is a fault in the CO system. | Contact an authorized FIRMAN service facility. | dealer | p. 28 |
| RED CO Alert Carbon Monoxide (CO) Shutdown Indicator Light | The engine shut down because carbon monoxide accumulated around the generator. The red CO Alert light indicates this shutdown. | Before restarting, move the generator to an open outdoor area at least 20 ft downwind from occupied spaces, with exhaust pointed away. Air out the premises before reoccupying. If you feel sick, dizzy or weak, get fresh air and call emergency services. | owner | p. 28 |
| Yellow CO Alert fault | A CO Alert system fault occurred and the engine shut down. The yellow light blinks for at least five minutes after shutdown. | See an authorized FIRMAN service dealer or service facility. | dealer | p. 28 |
Source: official Firman manual, read 2026-11-04. "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.