Magnum MMG235 troubleshooting: 8 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Magnum MMG235 — full specs, parts & maintenance.
| Code | Meaning |
|---|---|
| SD | Sensor fail (FLS) |
| WRN | Warning (WRN) |
| Symptom | Cause | Remedy |
|---|---|---|
| LOW FUEL LEVEL SHUT DOWN | Fuel level on the Liquid Crystal Display (LCD) window is low or fuel tank has leaks. | Check the fuel level and ensure it is not running dry. Check for leaks in the fuel tank. |
| LOW OIL PRESSURE SHUT DOWN | Engine oil pressure is less than 20 psi (138 kPa). | Check engine oil level and add oil if required. Visually inspect the engine for oil leaks. |
| LOW COOLANT LEVEL SHUT DOWN | Coolant level in the radiator is low or coolant lines have visible leaks. | Check the coolant level and add coolant if necessary. Inspect for leaks in coolant hoses, engine block, and water pump. |
| HIGH COOLANT TEMPERATURE SHUT DOWN | Coolant temperature is 230°F (110°C) or more. | Check coolant level in the overflow jug and add coolant if necessary. Inspect radiator, coolant hoses, engine block, water pump for leaks. Check serpentine drive belt tension. |
| OVERCRANK SHUT DOWN | Engine will not start. | Check fuel level in tank and proper operation of the fuel pump. Check air filter for blockage. |
| OVERSPEED OR UNDERSPEED SHUT DOWN | Engine speed is above or below 60.0 Hz. | Disconnect all loads and restart the generator to read frequency (Hz). Adjust engine speed as necessary. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Fuel level on the Liquid Crystal Display (LCD) window is low or fuel tank has leaks.. See the table for the matching fixes.
Documented causes: Engine oil pressure is less than 20 psi (138 kPa).. See the table for the matching fixes.
Documented causes: Coolant level in the radiator is low or coolant lines have visible leaks.. See the table for the matching fixes.