Generac 15 kW EcoGen troubleshooting: 70 fault codes and 60 symptom-cause-remedy entries from the manufacturer's own service documentation.
Generac 15 kW EcoGen — full specs, parts & maintenance.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| OVERSPEED | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Contact an IASD. |
| UNDERVOLTAGE | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Contact an IASD. |
| UNDERSPEED | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Contact an IASD. |
| STEPPER OVERCURRENT | Unit will not start in AUTO with remote start signal — LED red | Check the LEDs / screen for alarms | Contact an IASD. |
| MISWIRE | 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 remote start signal — LED red | Check the LEDs / screen for alarms | Contact an IASD. |
| 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. |
| BATTERY PROBLEM | Yellow LED illuminated in any state | Check the screen for additional information | Contact an IASD. |
| CHARGER WARNING | Yellow LED illuminated in any state | Check the screen for additional information | Contact an IASD. |
| SERVICE A | Yellow LED illuminated in any state | Check the screen for additional information | Perform SERVICE A maintenance. Press ENTER to clear. |
| SERVICE B | Yellow LED illuminated in any state | Check the screen for additional information | Perform SERVICE B maintenance. Press ENTER to clear. |
| INSPECT BATTERY | Yellow LED illuminated in any state | Check the screen for additional information | Inspect battery. Press ENTER to clear. |
| 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. 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. |
| 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. LED red | AVR is damaged | Contact servicing dealer. |
| 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 |
| 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. 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. 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. 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. LED red | Unit detects loss of output voltage while running. Alternator damage. Contact servicing dealer | 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. 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 |
| 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. | |
| 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. | |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
| OVERSPEED | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Contact servicing dealer. |
| UNDER VOLTAGE | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Contact servicing dealer. |
| UNDERSPEED | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Contact servicing dealer. |
| STEPPER OVERCURRENT | 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 2-wire start signal. | Check the LEDs/Screen for alarms. | Contact servicing dealer. |
| OVERVOLTAGE | Unit will not start in AUTO with 2-wire start signal. | Check the LEDs/Screen for alarms. | Contact servicing dealer. |
| 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. |
| 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 screen for additional information. | Contact servicing dealer |
| SERVICE A | Yellow LED illuminated in any state. | Check screen for additional information. | Perform SCHEDULE A maintenance. Press ENTER to clear. |
| SERVICE B | Yellow LED illuminated in any state. | Check screen for additional information. | Perform SCHEDULE B maintenance. Press ENTER to clear. |
| INSPECT BATTERY | Yellow LED illuminated in any state. | Check screen for additional information. | Inspect battery. Press ENTER to clear. |
| 1048 | VSCF Overload — Unit shuts down during operation. | 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. |
| 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. |
| 1053 | VSCF Gate Fault — Unit shuts down during operation or starting. | 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. | |
| 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. | |
| 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. | |
| 1058 | VSCF DC Undervoltage — Unit shuts down during operation or starting. | The DPE winding supplies this voltage. Alternator damage. | Contact servicing dealer. |
| 1059 | VSCF Field Loss — Unit shuts down during starting. | Unit detects no output voltage while starting. Alternator damage. | 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. |
| 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. | |
| 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. |
| Symptom | Cause | Remedy |
|---|---|---|
| Engine will not crank | Blown fuse | Correct short circuit condition by replacing 7.5 amp fuse in generator control panel. Contact an Independent Authorized Service Dealer (IASD) if fuse continues to blow. |
| Engine will not crank | Loose, corroded, or defective battery cables | Tighten, clean, or replace as necessary. |
| Engine will not crank | Defective starter contact | Contact an IASD for assistance. |
| Engine will not crank | Defective starter motor | Contact an IASD for assistance. |
| Engine will not crank | Discharged battery | Charge or replace battery. |
| Engine cranks but will not start | No fuel | Replenish fuel / turn on fuel valve. |
| Engine cranks but will not start | Defective fuel solenoid (FS) | Contact an IASD for assistance. |
| Engine cranks but will not start | Open Wire 14 from controller | Contact an IASD for assistance. |
| Engine cranks but will not start | Defective spark plug(s) | Clean; check gap; replace plug(s) if necessary. |
| Engine cranks but will not start | Valve clearance out of adjustment | Reset valve clearance. |
| Engine cranks but will not start | Fuel pressure too high | Verify proper fuel pressure. |
| Engine starts hard and runs rough | Air cleaner plugged or damaged | Check and clean air cleaner. |
| Engine starts hard and runs rough | Defective spark plug(s) | Clean; check gap; replace plug(s) as needed. |
| Engine starts hard and runs rough | Incorrect fuel pressure | Confirm fuel pressure to regulator is 10–12 in water column (19–22 mm Hg) for LP, and 3.5–7.0 in water column (9–13 mm Hg) for natural gas. |
| Engine starts hard and runs rough | Fuel selector in wrong position | Turn fuel conversion valve to correct position. |
| Engine starts hard and runs rough | Valve(s) out of adjustment | Adjust valve clearance. |
| Engine starts hard and runs rough | Internal engine issue | Contact an IASD for assistance. |
| Generator is set to OFF, but the engine continues to run | Controller wired incorrectly | Contact an IASD for assistance. |
| Generator is set to OFF, but the engine continues to run | Defective control board | Contact an IASD for assistance. |
| No AC output from generator | Main line circuit breaker (MLCB) (generator disconnect) is OFF (OPEN) | Reset generator disconnect to ON (CLOSED). |
| No AC output from generator | Generator internal failure | Contact an IASD for assistance. |
| No AC output from generator | Engine may be warming up. Refer to Cold Smart Start | Check the controller screen to verify status. |
| No transfer to generator power after startup | MLCB (generator disconnect) is OFF (OPEN) | Reset generator disconnect to ON (CLOSED). |
| No transfer to generator power after startup | Engine may be warming up. Refer to Cold Smart Start | Check the controller screen to verify status. |
| Unit consumes large amounts of oil | Excessive engine oil | Adjust oil to proper level. |
| Unit consumes large amounts of oil | Defective engine breather | Contact an IASD for assistance. |
| Unit consumes large amounts of oil | Improper type or viscosity of oil | See Engine Oil Requirements. |
| Unit consumes large amounts of oil | Damaged gasket, seal, or hose | Check for oil leaks. |
| Unit consumes large amounts of oil | Restricted air filter | Replace air filter. |
| Unit running in AUTO but no power at L1 and L2 — LED flashing green | Check MLCB | Check MLCB. If it is ON, contact an IASD. |
| Unit will not start in AUTO with remote start signal — LED green | Check screen for start delay countdown | If the startup delay is greater than expected, contact an IASD to adjust. |
| 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. |
| Output voltage is low/high | Voltage calibration incorrect | Contact servicing dealer. |
| Generator does not pull full power | Current calibration incorrect | Contact servicing dealer. |
| Engine will not crank. | Fuse blown. | Correct short circuit condition by replacing 7.5 Amp fuse. |
| Engine will not crank. | Loose, corroded or defective battery cables. | Tighten, clean or replace as necessary.* |
| Engine will not crank. | Defective starter contact. | Tighten, clean or replace as necessary.* |
| Engine will not crank. | Defective starter motor. | Tighten, clean or replace as necessary.* |
| Engine will not crank. | Dead Battery. | Charge or replace battery. |
| Engine cranks but will not start. | Out of fuel. | Replenish fuel / Turn on fuel valve. |
| Engine cranks but will not start. | Defective fuel solenoid (FS). | * |
| Engine cranks but will not start. | Defective spark plug(s). | Clean, re-gap or replace plug(s). |
| Engine cranks but will not start. | Valve clearance needs adjustment. | Adjust valve clearance. |
| Engine starts hard and runs rough. | Air cleaner plugged or damaged. | Check / replace air cleaner. |
| Engine starts hard and runs rough. | Defective spark plug(s). | Clean, re-gap or replace plug(s). |
| Engine starts hard and runs rough. | Fuel regulator not set. | Set fuel regulator. |
| Engine starts hard and runs rough. | Fuel pressure incorrect. | Confirm fuel pressure to regulator is 10-12” water column (19-22mm mercury) for LP, and 3.5 - 7” water column (9-13mm mercury) for natural gas. |
| Engine starts hard and runs rough. | Fuel selector in wrong position. | Move selector to correct position. |
| Generator is set to OFF, but the engine continues to run. | Control board wired incorrectly. | Repair wiring or replace control board.* |
| Generator is set to OFF, but the engine continues to run. | Defective control board. | Replace control board. |
| No AC output from generator. | Main line circuit breaker is in the OFF (or OPEN) position. | Reset circuit breaker to ON (or CLOSED). |
| No AC output from generator. | Generator internal failure. | * |
| Unit consumes large amounts of oil. | Oil tank is over filled with oil. | Adjust oil to proper level. |
| Unit consumes large amounts of oil. | Engine breather defective. | * |
| Unit consumes large amounts of oil. | Improper type or viscosity of oil. | See “Engine Oil Recommendations.” |
| Unit consumes large amounts of oil. | Damaged gasket, seal or hose. | Check for oil leaks. |
| Unit running in AUTO but no power in house. | Generator Disconnect circuit breaker. | Contact servicing dealer if Generator Disconnect circuit breaker is in the ON position. |
| 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. |
| Output voltage is low/high. | Voltage calibration incorrect. | Contact servicing dealer. |
| Generator does not pull full power. | Current calibration incorrect. | Contact servicing dealer. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Check the screen for additional information; Check screen for additional information.. See the table for the matching fixes.
Documented causes: See if screen says unit not activated.; Check the LEDs/Screen for alarms.. See the table for the matching fixes.
Documented causes: Air cleaner plugged or damaged; Defective spark plug(s); Incorrect fuel pressure; Fuel selector in wrong position. See the table for the matching fixes.