The Electronics 7310 MKII is a generator-set controller. It is used on generator sets from Generac, including the MDG175, MDG250, MDG25IF4 and MDG75DF4.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 1048 | VSCF Overload — Unit shuts down during operation. | Alternator, AVR or wiring is damaged. | Contact Independent Authorized Servicing Dealer. |
| 1049 | VSCF Overload — Unit shuts down during operation. | Generator output is shorted or severely overloaded. | Identify and clear the overload, and then restart. |
| 1049 VSCF | Overload RED Unit shuts down during operation. | Check the LEDs/Screen for alarms. Generator output is shorted or severely overloaded. Identify and clear the overload, and then restart. | |
| 1051 | VSCF High Battery — Yellow LED illuminated in any state. | Voltage supply to the AVR is high. | If an external battery charger is in use, contact installing dealer to correct installation. If an external battery charger is NOT in use, contact Independent Authorized Servicing Dealer. |
| 1051 VSCF | High Battery YELLOW LED illuminated in any state. | Check the LEDs/Screen for alarms. Voltage supply to the AVR is high. If an external battery charger is in use, contact installing dealer to correct installation. If an external battery charger is NOT in use, contact Independent Authorized Servicing Dealer. | |
| 1052 | VSCF DC Overvoltage — Unit shuts down during operation. | The generator was temporarily overloaded; The output was temporarily shorted. | Try to restart the unit. |
| 1052 VSCF | DC Overvoltage RED Unit shuts down during operation. | Check the LEDs/Screen for alarms. Probable causes are: 1) The generator was temporarily overloaded. 2) The output was temporarily shorted. Try to restart the unit. | |
| 1053 | VSCF Gate Fault — Unit shuts down during operation or starting. | AVR is damaged. | Contact Independent Authorized Servicing Dealer. |
| 1053 VSCF | Gate Fault RED Unit shuts down during operation or starting. | Check the LEDs/Screen for alarms. AVR is damaged. Contact Independent Authorized Servicing Dealer. | |
| 1054 | VSCF IGBT Overtemp. — Unit shuts down during operation or starting. | Replace AVR filter. Inspect fan. | Replace AVR filter. Inspect fan. |
| 1055 | VSCF Phase Error — Unit shuts down during starting. | An incorrect voltage and frequency has been detected during starting. Alternator damage. | Contact Independent Authorized Servicing Dealer. |
| 1055 VSCF | Phase Error RED Unit shuts down during starting. | Check the LEDs/Screen for alarms. An incorrect voltage and frequency has been detected during starting. Probable causes are: 1) Alternator damage. Contact Independent Authorized Servicing Dealer. 2) Generator has started into a severe load. Manually operate generator breaker and try to restart unit. If problem persists, remove load and attempt to restart unit again. 3) The engine may not be reaching its prescribed speed. Proceed as follows: •Verify stepper motor is moving and linkage is free. •Verify stepper motor is plugged in. •Verify gas pressure is within specified limits. | |
| 1056 | VSCF Undervoltage — Unit shuts down during operation or starting. | The generator output voltage is too low. The load is too large. | Remove load and attempt to restart unit. |
| 1056 VSCF | Undervoltage RED Unit shuts down during operation or starting. | Check the LEDs/Screen for alarms. The generator output voltage is too low. Probable causes are: 1) The load is too large. Remove load and attempt to restart unit. 2) Alternator or AVR damage. Contact Independent Authorized Servicing Dealer. | |
| 1057 | VSCF Overvoltage — Unit shuts down during operation or starting. | The generator has been overloaded. | Remove load and attempt to restart unit. |
| 1057 VSCF | Overvoltage RED Unit shuts down during operation or starting. | Check the LEDs/Screen for alarms. Probable causes are: 1) The generator has been overloaded. Remove load and attempt to restart unit. 2) Generator has started into a severe load. Manually operate generator breaker and try to restart unit. If problem persists, remove load and attempt to restart unit again. | |
| 1058 | VSCF DC Undervoltage — Unit shuts down during operation or starting. | The DPE winding supplies this voltage. Alternator damage. | Contact Independent Authorized Servicing Dealer. |
| 1058 VSCF | DC Undervoltage RED Unit shuts down during operation or starting. | Check the LEDs/Screen for alarms. The DPE winding supplies this voltage. 1) Alternator damage. Contact Independent Authorized Servicing Dealer. | |
| 1059 | VSCF Field Loss — Unit shuts down during starting. | Unit detects no output voltage while starting. Alternator damage. | Contact Independent Authorized Servicing Dealer. |
| 1059 VSCF | Field Loss RED Unit shuts down during starting. | Check the LEDs/Screen for alarms. Unit detects no output voltage while starting. 1) Alternator damage. Contact Independent Authorized Servicing Dealer. | |
| 1060 | Big Fan Failure — Unit shuts down during operation. | This alarm occurs when the AVR electronics temperature exceeds 70 C. AVR filter faulty. | Replace AVR filter. |
| 1061 | VSCF Field Loss — Unit shuts down during operation. | Unit detects loss of output voltage while running. Alternator damage. | Contact Independent Authorized Servicing Dealer. |
| 1061 VSCF | Field Loss RED Unit shuts down during operation. | Check the LEDs/Screen for alarms. Unit detects loss of output voltage while running. 1) Alternator damage. Contact Independent Authorized Servicing Dealer. | |
| 1065 | Overfrequency — Unit shuts down during operation. | Overload. | Remove load and attempt to restart unit. |
| 1066 | VSCF Speed mismatch — Unit shuts down during Operation or starting. | Fuel problem (pressure loss). | Check fuel supply and attempt to restart unit. |
| 1066 VSCF | Speed mismatch RED Unit shuts down during Operation or starting. | Check the LEDs/Screen for alarms. Probable causes are: 1) Fuel problem (pressure loss). Check fuel supply and attempt to restart unit. 2) Large overload. Remove load and attempt to restart unit. 3) Throttle or engine problem. Contact Independent Authorized Servicing Dealer. | |
| 1070 | Small fan failure — "Small fan failure" is displayed. If unit was running in AUTO, it will continue to run for one hour to cool electronics without fan. | Small fan current incorrect. Fan wiring or mechanical problem. | Contact Independent Authorized Servicing Dealer. |
| FUSE PROBLEM | Unit will not start in AUTO with 2-wire start signal. | Check ATO 7.5 Amp fuse. Replace with same type fuse if bad. Contact Independent Authorized Servicing Dealer if fuse is good. | |
| FXXX | Indicates a fault state. The DVR stops providing excitation. | ||
| HIGH TEMPERATURE | Unit shuts down during operation. | Check ventilation around the intake, exhaust and rear of generator. Contact Independent Authorized Servicing Dealer if no obstruction is found. | |
| LOW OIL PRESSURE | Unit will not start in AUTO with 2-wire start signal. | Check oil level. Add oil per Owner's Manual. Contact Independent Authorized Servicing Dealer if oil level is correct. | |
| LOW VOLTS REMOVE LOAD | Unit will not start in AUTO with 2-wire start signal. | Clear alarm and remove household loads from the generator. Set back to AUTO and restart. | |
| MISWIRE | Unit will not start in AUTO with 2-wire start signal. | Contact Independent Authorized Servicing Dealer. | |
| NOT ACTIVATED | Unit will not start in AUTO with 2-wire start signal. | Refer to Activation. | |
| OVERCRANK | Unit will not start in AUTO with 2-wire start signal. | Check fuel line shutoff valve is in the ON position. Clear alarm. Attempt to start the unit in MANUAL. If it does not start or starts and runs rough, contact Independent Authorized Servicing Dealer. | |
| OVERLOAD REMOVE LOAD | Unit shuts down during operation. | Clear alarm and remove household loads from the generator. Put back in AUTO and restart. | |
| OVERSPEED | Unit will not start in AUTO with 2-wire start signal. | Contact Independent Authorized Servicing Dealer. | |
| RPM SENSE LOSS | Unit was running and shuts down, attempts to restart. | Clear alarm and remove household loads from the generator. Put back in AUTO and restart. If problem returns, contact Independent Authorized Servicing Dealer to investigate possible fuel issue. | |
| RPM SENSE LOSS | Unit will not start in AUTO with 2-wire start signal. | Clear alarm. Navigate to the BATTERY MENU on the control pad LCD. Contact Independent Authorized Servicing Dealer if battery is GOOD. Replace battery If CHECK BATTERY is displayed. | |
| STEPPER OVERCURRENT | Unit will not start in AUTO with 2-wire start signal. | Contact Independent Authorized Servicing Dealer. | |
| UNDER VOLTAGE | Unit will not start in AUTO with 2-wire start signal. | Contact Independent Authorized Servicing Dealer. | |
| UNDERSPEED | Unit will not start in AUTO with 2-wire start signal. | Contact Independent Authorized Servicing Dealer. |
| Symptom | Cause | Remedy |
|---|---|---|
| Engine cranks but will not start. | Out of fuel. | Replenish fuel / Turn on fuel valve. |
| Engine starts hard and runs rough. | Air cleaner plugged or damaged. | Check / replace air cleaner. |
| Engine will not crank. | Fuse blown. | Correct short circuit condition by replacing 7.5 Amp fuse. |
| Generator does not pull full power. | Current calibration incorrect. | Contact Independent Authorized Servicing Dealer. |
| Generator is set to OFF, but the engine continues to run. | Control board wired incorrectly. | Repair wiring or replace control board.* |
| Generator stalls when large load is supplied. | Total load is too big for the generator. | Loads must be less than 10 kW or 2 hp when operating under 3600 rpm. Contact installing dealer to correct installation. |
| 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 (on controller). Stop engine immediately if coolant temperature is 210°F (99°C) or more. |
| High coolant temperature shutdown | Low coolant level | Allow engine to cool, then check coolant level in radiator. Add coolant if needed. Restart engine and check coolant temperature (on controller). Stop engine immediately if coolant temperature is 203 °F (95 °C) or higher. |
| Low Coolant Level Shutdown | Low coolant level | Allow engine to cool, then check coolant level in radiator. Add coolant, if needed. |
| Low Fuel Level Shutdown | Low fuel level | Check fuel level in LCD window of controller. |
| Low Oil Pressure Shutdown | Low oil level | Check oil level on dipstick. Add oil, if needed. |
| Low coolant level shutdown | Low coolant level | Allow engine to cool, then check coolant level in radiator. Add coolant, if needed. |
| Low fuel level Shutdown | Low fuel level | Check fuel level in LCD window of controller. |
| Low fuel level shutdown | Low fuel level | Check fuel level in LCD window of controller. |
| Low oil pressure shutdown | Low oil level | Check oil level on dipstick. Add oil, if needed. |
| No AC output from generator. | Main line circuit breaker is in the OFF (or OPEN) position. | Reset circuit breaker to ON (or CLOSED). |
| Output voltage is low/high. | Voltage calibration incorrect. | Contact Independent Authorized Servicing Dealer. |
| Overcrank Shutdown | Fuel level low | Check fuel level in tank. |
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.