The Power Zone is a generator-set controller. It is used on generator sets from Generac and Magnum, including the MDG150, MDG175, MDG250 and MG625.
Used across brands: Generac, Magnum
Also fitted to: Generac MDG20IF4 • MLG20IF4, Generac SG750/MG750.
| Code | Meaning |
|---|---|
| FXXX | Indicates a fault state. The DVR stops providing excitation. |
| Ubat | Battery voltage is out of limits given by Batt Undervolt setpoints. |
| Symptom | Cause | Remedy |
|---|---|---|
| AXXX indicates an alarm state. The DVR continues to provide excitation, if excitation is enabled. | [blank] Indicates normal operation in SLEEP mode. STBY Indicates normal operation in stand-by mode, waiting for the STRT state. STRT Indicates DVR is in a soft start state. RUN.V Indicates normal operation, with excitation in AVR mode. RUN.I Indicates normal operation, with excitation in FCR mode. RUN.P Indicates normal operation, with excitation in VAR or PF mode. FLSH Indicates DVR is in field flashing mode. IDLE Indicates normal operation in idle state, waiting for the speed to take off. | |
| Emergency Stop indicator LED is illuminated. | Resolve by deactivating (pulling out) Emergency Stop switch. | |
| HIGH COOLANT TEMPERATURE SHUTDOWN | 1. Check the coolant level in the overflow jug. 2. Restart the engine and read the coolant temperature to verify a high coolant temperature shutdown. Stop the engine immediately if the coolant temperature is 210°F (99°C) or more. 3. Allow the engine to cool. Add coolant to the overflow jug if it is low and then check the level of coolant in the radiator. To access the radiator cap, you must remove the access panel from the top of the enclosure directly above the radiator. Add coolant until it is 3/4 in. (1.9 cm) below the filler neck. Secure the radiator cap back into its original position. 4. Check the radiator shroud and ducting for blockage and remove any foreign matter. 5. Inspect coolant hoses, engine block and water pump for visible leaks. 6. Check the tension of the serpentine drive belt for the water pump. 7. If no other problems are found, remove the load on the generator and restart the engine. Check the coolant temperature and shut the engine down immediately if it starts to overheat. Refer to the engine operator’s manual for additional information on engine overheating. | |
| High Coolant Temperature Shutdown | Low coolant level, Blockage in radiator, Leakage in coolant hoses, engine block, or water pump | Add coolant if needed. Allow engine to cool, then check coolant level in radiator. Restart engine and check coolant temperature (on controller). Stop engine immediately if coolant temperature is 210°F (99°C) or more. Check radiator shroud and ducting for blockage and remove any foreign matter. Inspect for visible leaks. Check tension of water pump serpentine drive belt. Remove load on generator and restart engine. Check coolant temperature and shut engine down immediately if it starts to overheat. See the OEM engine operator’s manual for additional information on engine overheating. |
| LOW COOLANT LEVEL SHUTDOWN | Coolant level in the radiator is low. | Allow the engine to cool. Check the coolant level in the radiator. |
| LOW FUEL LEVEL SHUTDOWN | Fuel level is low, fuel tank has leaks, or fuel level sender and wiring are damaged. | Check the fuel level on the Home screen. Confirm that the generator is sitting level to ensure an accurate reading. Check for leaks in the fuel tank. If the fuel level is good and no leaks are found, check the fuel level sender and the connecting wiring for damage. |
| LOW OIL PRESSURE SHUTDOWN | Oil pressure is less than 20 psi (138 kPa), engine has oil leaks, or oil pressure sender is faulty. | Check the level of the engine oil with the dipstick. Visually inspect the engine for oil leaks. If the oil level is good, restart the unit and verify the loss of oil pressure. Check the oil pressure sender. |
| Low Coolant Level | Shutdown, Low coolant level, Coolant hoses leaking, Engine block or water pump leaking | Allow engine to cool, then check coolant level in radiator. Add coolant, if needed. |
| Low Coolant Level Shutdown | Low coolant level, Coolant hoses leaking, Engine block or water pump leaking | Allow engine to cool, then check coolant level in radiator. Add coolant if needed. Inspect hoses for leaks. Repair or replace as necessary. Visually inspect for leaks. Verify no coolant has mixed with the engine oil (oil will appear milky). See the OEM engine operator’s manual for additional information. |
| Low Fuel Level | Shutdown, Low fuel level, Unit not level, Fuel tank leaking, Damaged fuel sender or wiring | Check fuel level in LCD window of controller. Confirm that unit is sitting level to ensure an accurate reading. Check tank for leaks. Check for continuity between sender and engine controller. |
| Low Fuel Level Shut-down | Low fuel level, Unit not level, Fuel tank leaking, Damaged fuel sender or wiring | Check fuel level in LCD window of controller. Verify unit is sitting level to ensure an accurate reading. Check tank for leaks. Check for continuity between sender and engine controller (see DC Wiring). |
| Low Load indicator LED is illuminated. | Resolve by increasing electrical load. If unable to operate genset at more than 30% load, use a smaller generator. | |
| Low Oil Pressure | Shutdown, Low oil level, Oil leaking from engine, Oil pressure sender | Check oil level on dipstick. Add oil, if needed. Visually inspect the engine for leaks. Restart unit and verify loss of pressure. Shut down immediately if pressure does not reach 5 psi (34 kPa) within five seconds. See engine operator’s manual to identify corrective action. |
| Low Oil Pressure Shut-down | Low oil level, Oil leaking from engine, Oil pressure sender | Check oil level on dipstick. Add oil, if needed. Visually inspect the engine for leaks. Restart unit and verify loss of pressure. Shut down immediately if pressure does not reach 5 psi (34 kPa) within five seconds. Refer to engine operator’s manual to identify corrective action. |
| Low Oil Pressure Shutdown | Low oil level, Oil leaking from engine, Oil pressure sender | Check oil level on dipstick. Add oil, if needed. Visually inspect the engine for leaks. Restart unit and verify loss of pressure. Shut down immediately if pressure does not reach 5 psi (34 kPa) within five seconds. See the OEM engine operator’s manual to identify corrective action. |
| Lug Door Open indicator LED is illuminated. | Resolve by closing lug-box door. If condition remains unresolved, inspect lug-box door safety switch for proper operation. | |
| OVERCRANK SHUTDOWN | 1. Check the fuel level in the tank. 2. Check for proper operation of the fuel pump. 3. Check the air filter for blockage. 4. If the engine will not start, refer to the engine operator’s manual for additional information on trouble-shooting starting problems. | |
| OVERSPEED OR UNDERSPEED SHUTDOWN | 1. Disconnect all loads and restart the generator. Read the frequency (Hz) on the LCD window. With no loads on the generator, the frequency should read 60.0 Hz. 2. If the frequency is above or below 60.0 Hz, the engine speed will have to be adjusted. Refer to the engine operator’s manual for throttle adjustments on mechanically governed units and refer to the electronic governor manual for electronically controlled units. | |
| Overcrank Shutdown | Fuel level low, Check fuel level in tank, Check fuel pump operation, Check air filter for blockage | See the OEM engine operator’s manual for additional information. |
| Overspeed or Under-speed 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. Contact Generac Mobile Products to adjust. |
| Shutdown indicator LED is illuminated. | Resolve by resolving shutdown condition. |
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.