The Power Zone Plus (if equipped) is a generator-set controller. It is used on generator sets from Generac, including the MLT4060, MLT4060MV, MLT4080KV and MLT4150MV.
| Symptom | Cause | Remedy |
|---|---|---|
| High coolant temperature shutdown | Low coolant level | Add coolant if needed. Allow engine to cool, then check coolant level in radiator. Restart engine and check coolant temperature. Stop engine immediately if coolant temperature is 210°F (99°C) or more. |
| Low oil pressure shutdown | Low oil level | Verify oil level on dipstick. Add oil, if needed. |
| Mast Lights OFF and ballast indicators on control panel OFF | Lighting connections loose | Check wire connections: Inside control box; Inside each ballast box. |
| Mast Lights OFF but ballast indicators on control panel ON | Light fixture too hot | Allow light fixture to cool 10-15 minutes before restarting. |
| Mast Lights ON but light output low | Fixture and/or lens is dirty | Clean components: Reflective surface of light fixture; Inside and outside surface of glass lens. Clean components only with mild soap and water. Other chemicals may damage surfaces and glass. |
| Mast Lights Off, and Ballast Indicators on the Control Panel are Off. | Loose lighting connections | Check the connections inside the control box and inside each ballast box. |
| Mast Lights Off, but Ballast Indicators on Control Panel are On. | 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. |
| Mast lights OFF, ballast indicators OFF | Loose lighting connections | Check the connections inside the control box and inside each ballast box. |
| Mast lights OFF, ballast indicators ON | Light fixture is too hot | Allow light to cool 10-15 minutes before restarting. |
| Mast lights ON, low light output | 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. |
| Mast lights off, checking inside control box | Lighting connections loose | Check connections inside control box. |
| Mast lights off, checking outside control box | Light fixture too hot | Allow light fixture to cool 10–15 minutes before restarting. |
| Overspeed or Underspeed Shutdown | Frequency setting incorrect | Disconnect all loads and restart unit. Read frequency (Hz) in the LCD window on controller. Frequency should read 60 Hz. If frequency is above 60 Hz, engine speed will need to be adjusted. Refer to the engine operator's manual for throttle adjustment information. |
| Unit cranks but does not start | Fuel level low | Check fuel level in tank. Verify fuel pump operation. |
| Unit cranks, but will not start | Fuel level low | Check fuel level in tank. Verify fuel pump operation. |
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.