The G-Flex is a generator-set controller. It is used on generator sets from Generac, including the 15 kW EcoGen.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 1048 | VSCF Overload — Unit shuts down during operation. | Alternator, AVR or wiring is damaged. | Contact servicing dealer. |
| 1048 | VSCF Overload — Unit shuts down during operation. LED red | Alternator, AVR or wiring is damaged | Contact 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 — Unit shuts down during operation. LED red | 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 servicing dealer. |
| 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 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 — Unit shuts down during operation. LED red | The generator was temporarily overloaded; 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 servicing dealer. |
| 1053 | VSCF Gate Fault — Unit shuts down during operation or starting. LED red | AVR is damaged | Contact servicing dealer. |
| 1055 | VSCF Phase Error — Unit shuts down during starting. | An incorrect voltage and frequency has been detected during starting. Probable causes are: Alternator damage. Contact servicing dealer.; 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.; 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. | |
| 1055 | VSCF Phase Error — Unit shuts down during starting. LED red | An incorrect voltage and frequency has been detected during starting. Alternator damage. Contact servicing dealer; 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; The engine may not be reaching its prescribed speed | Contact servicing dealer; Manually operate generator breaker and try to restart unit. If problem persists, remove load and attempt to restart unit again; Verify stepper motor is moving and linkage is free; Verify stepper motor is plugged in; Verify gas pressure is within specified limits |
| 1055 VSCF Phase Error | 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 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. Probable causes are: The load is too large. Remove load and attempt to restart unit.; Alternator or AVR damage. Contact servicing dealer. | |
| 1056 | VSCF Undervoltage — Unit shuts down during operation or starting. LED red | The generator output voltage is too low. The load is too large. Remove load and attempt to restart unit; Alternator or AVR damage. Contact servicing dealer | Remove load and attempt to restart unit; Contact servicing dealer |
| 1057 | VSCF Overvoltage — Unit shuts down during operation or starting. | The generator has been overloaded. Remove load and attempt to restart unit.; 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. | |
| 1057 | VSCF Overvoltage — Unit shuts down during operation or starting. LED red | The generator has been overloaded. Remove load and attempt to restart unit; 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 | Remove load and attempt to restart unit; 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 servicing dealer. |
| 1058 | VSCF DC Undervoltage — Unit shuts down during operation or starting. LED red | The DPE winding supplies this voltage. Alternator damage. Contact servicing dealer | Contact servicing dealer. |
| 1059 | VSCF Field Loss — Unit shuts down during starting. | Unit detects no output voltage while starting. Alternator damage. | Contact servicing dealer. |
| 1059 | VSCF Field Loss — Unit shuts down during starting. LED red | Unit detects no output voltage while starting. Alternator damage. Contact servicing dealer | Contact servicing dealer. |
| 1061 | VSCF Field Loss — Unit shuts down during operation. | Unit detects loss of output voltage while running. Alternator damage. | Contact servicing dealer. |
| 1061 | VSCF Field Loss — Unit shuts down during operation. LED red | Unit detects loss of output voltage while running. Alternator damage. Contact servicing dealer | Contact servicing dealer. |
| 1061 VSCF Field Loss | Unit shuts down during operation. | Check the LEDs/Screen for alarms. Unit detects loss of output voltage while running. Probable causes are: 1) Alternator damage. Contact servicing dealer. | |
| 1065 | Overfrequency — Unit shuts down during operation. | Overload. Remove load and attempt to restart unit.; RPM sensor has failed. Contact servicing dealer.; Stepper motor problem. Contact servicing dealer. | |
| 1065 | Overfrequency — Unit shuts down during operation. LED red | Overload. Remove load and attempt to restart unit; RPM sensor has failed. Contact servicing dealer; Stepper motor problem. Contact servicing dealer | Remove load and attempt to restart unit; Contact servicing dealer |
| 1066 | VSCF Speed mismatch — Unit shuts down during Operation or starting. | Fuel problem (pressure loss). Check fuel supply and attempt to restart unit.; Large overload. Remove load and attempt to restart unit.; Throttle or engine problem. Contact servicing dealer. | |
| 1066 | VSCF Speed mismatch — Unit shuts down during Operation or starting. LED red | Fuel problem (pressure loss). Check fuel supply and attempt to restart unit; Large overload. Remove load and attempt to restart unit; Throttle or engine problem. Contact servicing dealer | Check fuel supply and attempt to restart unit; Remove load and attempt to restart unit; Contact servicing dealer |
| BATTERY PROBLEM | Yellow LED illuminated in any state | Check the screen for additional information | Contact an IASD. |
| BATTERY PROBLEM | Yellow LED illuminated in any state. | Check screen for additional information. | Contact servicing dealer. |
| CHARGER WARNING | Yellow LED illuminated in any state | Check the screen for additional information | Contact an IASD. |
| CHARGER WARNING | Yellow LED illuminated in any state. | Check screen for additional information. | Contact servicing dealer |
| FUSE PROBLEM | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Check ATO 7.5 Amp fuse. Replace with same type fuse if bad. Contact servicing dealer if fuse is good. |
| FUSE PROBLEM | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Check the 7.5 amp fuse. If it is blown, replace it with an ATO 7.5 amp fuse. If the fuse is intact, contact an IASD. |
| HIGH TEMPERATURE | Unit shuts down during operation — LED red | Check the LEDs / screen for alarms | Check ventilation around the generator, intake, exhaust, and rear of generator. If no obstructions are present, contact an IASD. |
| HIGH TEMPERATURE | Unit shuts down during operation. | Check the LEDs/Screen for alarms. | Check ventilation around the intake, exhaust and rear of generator. Contact serving dealer if no obstruction is found. |
| INSPECT BATTERY | Yellow LED illuminated in any state | Check the screen for additional information | Inspect battery. Press ENTER to clear. |
| INSPECT BATTERY | Yellow LED illuminated in any state. | Check screen for additional information. | Inspect battery. Press ENTER to clear. |
| LOW BATTERY | Yellow LED illuminated in any state | Check the screen for additional information | Clear alarm. Using the control panel, check the battery by navigating to the BATTERY MENU option from the MAIN MENU. If battery condition displays GOOD, contact an IASD. If control panel displays CHECK BATTERY, replace the battery. |
| LOW BATTERY | Yellow LED illuminated in any state. | Check screen for additional information. | Clear alarm. Navigate to the BATTERY MENU on the control pad LCD. Contact servicing dealer if battery is GOOD. Replace battery If CHECK BATTERY is displayed. |
| LOW OIL PRESSURE | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Check oil level. Add oil per Owner’s Manual. Contact servicing dealer if oil level is correct. |
| LOW OIL PRESSURE | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Check oil level and add oil as needed. If oil level is correct, contact an IASD. |
| LOW VOLTS REMOVE LOAD | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Clear alarm and remove household loads from the generator. Set back to AUTO and restart. |
| LOW VOLTS REMOVE LOAD | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Clear alarm and remove household loads from the generator. Put in AUTO and restart. |
| MISWIRE | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Contact servicing dealer. |
| MISWIRE | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Contact an IASD. |
| NOT ACTIVATED | Unit will not start in AUTO with 2-wire start signal. | See if screen says unit not activated. | Refer to activation section in Owner’s Manual. |
| NOT ACTIVATED | Unit will not start in AUTO with remote start signal — LED none | Check if screen says unit not activated | Refer to “Activation” in installation manual. |
| OVERCRANK | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | 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 servicing dealer. |
| OVERCRANK | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Check fuel line shutoff valve is ON. Clear alarm. Start the unit in MANUAL. If it does not start, or starts and runs rough, contact an IASD. |
| OVERLOAD REMOVE LOAD | Unit shuts down during operation — LED red | Check the LEDs / screen for alarms | Clear alarm and remove household loads from the generator. Put in AUTO and restart. |
| OVERLOAD REMOVE LOAD | Unit shuts down during operation. | Check the LEDs/Screen for alarms. | 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. | Check the LEDs/Screen for alarms. | Contact servicing dealer. |
| OVERSPEED | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Contact an IASD. |
| OVERVOLTAGE | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Contact servicing dealer. |
| OVERVOLTAGE | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Contact an IASD. |
| RPM SENSE LOSS | Unit was running and shut down, attempts to restart — LED red | Check the LEDs / screen for alarms | Clear alarm and remove household loads from the generator. Put into AUTO and restart. If generator does not start, contact an IASD. |
| RPM SENSE LOSS | Unit was running and shuts down, attempts to restart. | Check the LEDs/Screen for alarms. | Clear alarm and remove household loads from the generator. Put back in AUTO and restart. If problem returns, contact servicing dealer to investigate possible fuel issue. |
| RPM SENSE LOSS | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Clear alarm. Navigate to the BATTERY MENU on the control pad LCD. Contact servicing dealer if battery is GOOD. Replace battery If CHECK BATTERY is displayed. |
| RPM SENSE LOSS | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Clear alarm. Using the control panel, check the battery by navigating to the BATTERY MENU option from the MAIN MENU. If battery condition displays GOOD, contact an IASD. If control panel displays CHECK BATTERY, replace the battery. |
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.