The Engraved aluminum punched is a generator-set controller. It is used on generator sets from Generac, including the MLT4200IF4.
| Code | Meaning |
|---|---|
| Battery Under/Over Voltage | Engine’s DC supply has fallen below or risen above its configured alarm level. |
| Check Engine Fault | A fault not recognized by the controller has been detected. |
| Low Fuel Level | Engine’s fuel level has fallen below its configured low fuel level alarm. |
| Low Oil Pressure | Engine oil pressure has fallen below its configured low oil pressure alarm level. |
| Overspeed | Engine speed has risen above its configured overspeed alarm level. |
| Underspeed | Engine speed has fallen below its configured underspeed alarm level. |
| Symptom | Cause | Remedy |
|---|---|---|
| High coolant temperature shutdown | Low coolant level | Allow engine to cool, then check coolant level in radiator. Add coolant if needed |
| Low oil pressure shutdown | Oil level low | Check oil level. Add oil if necessary |
| Mast Lights Off, Checking Inside the Control Box | Loose lighting connections | Check the connections inside the control box and inside each ballast box |
| Mast Lights Off, Checking Outside the Control Box | Light fixture is too hot | Allow light to cool 10-15 minutes before restarting |
| Mast Lights On But the Light Output is Low | Fixture and/or lens is dirty | Clean reflective surface inside fixture and both inside and outside surface of glass lens. Use mild soap and water to clean lens. Other chemicals may have an adverse effect on the glass |
| One or more lights do not turn on | Light breaker tripped | Check light breakers |
| The lights are flashing | Dusk-to-dawn sensor adjustment needed | Adjust the dusk-to-dawn sensor to increase or decrease light received |
| Unit cranks, but will not start | Fuel level low | Check fuel level in tank |
| Unit stalls when export power is used | Load exceeds unit rating | Turn outlet breaker ON and load sense switch OFF, confirm generator output is 60hz + or - 2hz. Reapply load |
| Unit starts, but stumbles and dies | Ambient temperature too low | Check if ambient temperature is within unit limits |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.