Generac G0072100 troubleshooting: 60 fault codes and 47 symptom-cause-remedy entries from the manufacturer's own service documentation.
Generac G0072100 — full specs, parts & maintenance.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| HIGH TEMPERATURE | Unit shuts down during operation — LED RED | Check LEDs / screen for alarms. | Inspect ventilation around 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 LEDs / screen for alarms. | Clear alarm and remove household loads from generator. Put in AUTO and restart. |
| RPM SENSE LOSS | Unit was running and shut down, attempts to restart — LED RED | Check LEDs / screen for alarms. | Clear alarm and remove household loads from generator. Put into AUTO and restart. If generator does not start, contact an IASD. |
| NOT ACTIVATED | Unit will not start in AUTO with utility loss — LED NONE | Check if screen says unit not activated. | See Activation section in installation manual. |
| LOW OIL PRESSURE | Unit will not start in AUTO with utility loss — LED RED | Check 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 utility loss — LED RED | Check LEDs / screen for alarms. | Clear alarm. Using control panel, check battery by navigating to BATTERY MENU option from MAIN MENU. If battery condition displays GOOD, contact an IASD. If control panel displays CHECK BATTERY, replace battery. |
| OVERCRANK | Unit will not start in AUTO with utility loss — LED RED | Check LEDs / screen for alarms. | Verify fuel line shutoff valve is ON. Clear alarm. Start 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 utility loss — LED RED | Check LEDs / screen for alarms. | Clear alarm and remove household loads from generator. Put in AUTO and restart. |
| OVERSPEED | Unit will not start in AUTO with utility loss — LED RED | Check LEDs / screen for alarms. | Contact an IASD. |
| UNDERVOLTAGE | Unit will not start in AUTO with utility loss — LED RED | Check LEDs / screen for alarms. | Contact an IASD. |
| UNDERSPEED | Unit will not start in AUTO with utility loss — LED RED | Check LEDs / screen for alarms. | Contact an IASD. |
| STEPPER OVERCURRENT | Unit will not start in AUTO with utility loss — LED RED | Check LEDs / screen for alarms. | Contact an IASD. |
| WIRING ERROR | Unit will not start in AUTO with utility loss — LED RED | Check LEDs / screen for alarms. | Contact an IASD. |
| OVERVOLTAGE | Unit will not start in AUTO with utility loss — LED RED | Check LEDs / screen for alarms. | Contact an IASD. |
| AUXILIARY SHUTDOWN | Unit will not start — LED RED | Check auxiliary shutdown switches | Set auxiliary shutdown switch(es) to CLOSED (I). Clear alarm. |
| LOW BATTERY | Yellow LED illuminated in any state — LED YELLOW | Check screen for additional information. | Clear alarm. Using control panel, check battery by navigating to BATTERY MENU option from MAIN MENU. If battery condition displays GOOD, contact an IASD. If control panel displays CHECK BATTERY, replace battery. |
| BATTERY PROBLEM | Yellow LED illuminated in any state — LED YELLOW | Check screen for additional information. | Contact an IASD. |
| CHARGER WARNING | Yellow LED illuminated in any state — LED YELLOW | Check screen for additional information. | |
| HIGH TEMPERATURE | Unit shuts down during operation — LED red | Inspect ventilation around 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 | Clear alarm and remove household loads from generator. Put in AUTO and restart | |
| RPM SENSE LOSS | Unit was running and shut down, attempts to restart — LED red | Clear alarm and remove household loads from generator. Put into AUTO and restart. If generator does not start, contact an IASD | |
| NOT ACTIVATED | Unit will not start in AUTO with utility loss — LED none | See Activation section in installation manual | |
| LOW OIL PRESSURE | Unit will not start in AUTO with utility loss — LED red | 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 utility loss — LED red | Clear alarm. Using control panel, check battery by navigating to BATTERY MENU option from MAIN MENU. If battery condition displays GOOD, contact an IASD. If control panel displays CHECK BATTERY, replace battery | |
| OVERCRANK | Unit will not start in AUTO with utility loss — LED red | Verify fuel line shutoff valve is ON. Clear alarm. Start 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 utility loss — LED red | Clear alarm and remove household loads from generator. Put in AUTO and restart | |
| OVERSPEED | Unit will not start in AUTO with utility loss — LED red | Contact an IASD | |
| UNDERVOLTAGE | Unit will not start in AUTO with utility loss — LED red | Contact an IASD | |
| UNDERSPEED | Unit will not start in AUTO with utility loss — LED red | Contact an IASD | |
| STEPPER OVERCURRENT | Unit will not start in AUTO with utility loss — LED red | Contact an IASD | |
| WIRING ERROR | Unit will not start in AUTO with utility loss — LED red | Contact an IASD | |
| OVERVOLTAGE | Unit will not start in AUTO with utility loss — LED red | Contact an IASD | |
| SHUTDOWN SWITCH | Unit will not start — LED flashing red | Set emergency shutdown switch(es) to CLOSED (I). Clear alarm | |
| LOW BATTERY | Yellow LED illuminated in any state | Clear alarm. Using control panel, check battery by navigating to BATTERY MENU option from MAIN MENU. If battery condition displays GOOD, contact an IASD. If control panel displays CHECK BATTERY, replace battery | |
| BATTERY PROBLEM | Yellow LED illuminated in any state | Contact an IASD | |
| CHARGER WARNING | Yellow LED illuminated in any state | Contact an IASD | |
| CHARGER MISSING AC | Yellow LED illuminated in any state | Contact an IASD | |
| SERVICE A | Yellow LED illuminated in any state | Perform SERVICE A maintenance. Press ENTER to clear | |
| SERVICE B | Yellow LED illuminated in any state | Perform SERVICE B maintenance. Press ENTER to clear | |
| INSPECT BATTERY | Yellow LED illuminated in any state | Inspect battery. Press ENTER to clear | |
| HIGH TEMPERATURE | Unit shuts down during operation — LED: RED | Inspect ventilation around 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 | Clear alarm and remove household loads from generator. Put back in AUTO and restart | |
| RPM SENSE LOSS | Unit was running and shuts down, attempts to restart — LED: RED | Clear alarm and remove household loads from generator. Put back in AUTO and restart. If generator does not start, contact an IASD | |
| NOT ACTIVATED | Unit will not start in AUTO with utility loss — LED: NONE | See Activation | |
| LOW OIL PRESSURE | Unit will not start in AUTO with utility loss — LED: RED | 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 utility loss — LED: RED | Clear alarm. Using control panel, check battery by navigating to BATTERY MENU option from MAIN MENU. If battery condition displays GOOD, contact an IASD. If control panel displays CHECK BATTERY, replace battery | |
| OVERCRANK | Unit will not start in AUTO with utility loss — LED: RED | Verify fuel line shutoff valve is ON. Clear alarm. Start 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 utility loss — LED: RED | Clear alarm and remove household loads from generator. Put into AUTO and restart | |
| OVERSPEED | Unit will not start in AUTO with utility loss — LED: RED | Contact an IASD | |
| UNDERVOLTAGE | Unit will not start in AUTO with utility loss — LED: RED | Contact an IASD | |
| UNDERSPEED | Unit will not start in AUTO with utility loss — LED: RED | Contact an IASD | |
| STEPPER OVERCURRENT | Unit will not start in AUTO with utility loss — LED: RED | Contact an IASD | |
| WIRING ERROR | Unit will not start in AUTO with utility loss — LED: RED | Contact an IASD | |
| OVERVOLTAGE | Unit will not start in AUTO with utility loss — LED: RED | Contact an IASD | |
| SHUTDOWN SWITCH | Unit will not start — LED: FLASHING RED | Set emergency shutdown switch(es) to CLOSED (I) | |
| LOW BATTERY | Yellow LED illuminated in any state — LED: YELLOW | Clear alarm. Using control panel, check battery by navigating to BATTERY MENU option from MAIN MENU. If battery condition displays GOOD, contact an IASD. If control panel displays CHECK BATTERY, replace battery | |
| BATTERY PROBLEM | Yellow LED illuminated in any state — LED: YELLOW | Contact an IASD | |
| CHARGER WARNING | Yellow LED illuminated — LED: YELLOW | ||
| 009209 | Puesta en marcha automática | ||
| 001810 | Auxiliary Shutdown |
| Symptom | Cause | Remedy |
|---|---|---|
| Engine will not crank | Blown fuse | Correct short circuit condition by replacing 7.5 A fuse in generator control panel. Contact an IASD if fuse continues to blow. |
| Engine will not crank | Loose, corroded, or faulty battery cables | Tighten, clean, or replace as necessary. |
| Engine will not crank | Faulty starter contact | |
| Engine will not crank | Faulty starter motor | |
| 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 | Faulty fuel solenoid (FS) | Contact an IASD for assistance. |
| Engine cranks but will not start | Harness/wiring issue | |
| Engine cranks but will not start | Faulty spark plug(s) | Inspect spark plug gap; replace spark plug(s) if out of tolerance. |
| Engine cranks but will not start | Valve clearance out of adjustment, if applicable. See Engine. | Inspect and adjust valve clearance. |
| Engine starts hard and runs rough | Plugged or damaged air cleaner | Inspect and clean air cleaner. |
| Engine starts hard and runs rough | Faulty spark plug(s) | Inspect spark plug gap; replace spark plug(s) if out of tolerance. |
| Engine starts hard and runs rough | Incorrect fuel pressure | Verify fuel pressure to regulator is 10–12 in water column (2.49–2.99 kPa) for LP gas, and 3.5–7.0 in water column (0.87–1.74 kPa) for NG. |
| Engine starts hard and runs rough | Fuel selector in wrong position | Set fuel conversion valve to correct position and program controller for fuel type. |
| Engine starts hard and runs rough | Valve clearance out of adjustment, if applicable. See Engine. | Inspect and adjust valve clearance. |
| Engine starts hard and runs rough | Internal engine issue | Contact an IASD for assistance. |
| Unit is set to OFF, but engine continues to run | Controller wired incorrectly | Contact an IASD for assistance. |
| Unit is set to OFF, but engine continues to run | Faulty control board | |
| No AC output from generator | Generator MLCB (generator disconnect) is OFF (OPEN) | Set generator MLCB (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. See Cold Smart Start. | Check the controller screen to verify status. |
| No transfer to standby after utility source failure | Generator MLCB (generator disconnect) is OFF (OPEN) | Set generator MLCB (generator disconnect) to ON (CLOSED). |
| No transfer to standby after utility source failure | Faulty transfer switch coil | Contact an IASD for assistance. |
| No transfer to standby after utility source failure | Faulty transfer relay | |
| No transfer to standby after utility source failure | Transfer relay circuit open | |
| No transfer to standby after utility source failure | Faulty control logic board | |
| No transfer to standby after utility source failure | Engine may be warming up. See Cold Smart Start. | Check controller screen to verify status. |
| Unit consumes large amounts of oil | Excessive engine oil | Adjust oil to correct level. See Checking Engine Oil Level. |
| Unit consumes large amounts of oil | Faulty engine breather | Contact an IASD for assistance. |
| Unit consumes large amounts of oil | Incorrect type or viscosity of oil | See Engine Oil Requirements. |
| Unit consumes large amounts of oil | Damaged gasket, seal, or hose | Inspect for oil leaks. |
| Unit consumes large amounts of oil | Restricted air filter | Replace air filter. |
| Wi-Fi network connection broken or intermittent | Various | See Wi-Fi module owner’s manual. |
| Unit running in AUTO but no power in house — LED FLASHING GREEN | Check generator MLCB (generator disconnect). | Check generator MLCB (generator disconnect). If it is ON, contact an IASD. |
| Unit will not start in AUTO with utility loss — LED GREEN | Check screen for start delay countdown. | If startup delay is greater than expected, contact an IASD to adjust from 2 to 1500 seconds. |
| Engine cranks but will not start | Valve clearance out of adjustment, if applicable. See Engine | Inspect and adjust valve clearance |
| Engine starts hard and runs rough | Valve clearance out of adjustment, if applicable. See Engine | Inspect and adjust valve clearance |
| No AC output from generator | Engine may be warming up. See Cold Smart Start | Check the controller screen to verify status |
| No transfer to standby after utility source failure | Engine may be warming up. See Cold Smart Start | Check controller screen to verify status |
| Unit running in AUTO but no power in house — LED flashing green | Check generator MLCB (generator disconnect). If it is ON, contact an IASD | |
| Unit will not start in AUTO with utility loss — LED green | If startup delay is greater than expected, contact an IASD to adjust from 2 to 1500 seconds | |
| Engine cranks but will not start | High fuel pressure | Check and adjust fuel pressure |
| Engine cranks but will not start | Fuel selector in wrong position | Set fuel conversion valve to correct position and program controller for fuel type, if necessary |
| Engine cranks but will not start | Valve clearance out of adjustment. (If applicable. See Specification section in owner's manual.) | Inspect and adjust valve clearance |
| Engine starts hard and runs rough | Valve clearance out of adjustment. (If applicable. See Specification section in owner's manual.) | Inspect and adjust valve clearance |
| Unit running in AUTO but no power in house — LED: FLASHING GREEN | Check generator MLCB (generator disconnect). If it is ON, contact an IASD | |
| Unit will not start in AUTO with utility loss — LED: GREEN | If startup delay is greater than expected, contact an IASD to adjust between 2 to 1500 seconds |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Check LEDs / screen for alarms.. See the table for the matching fixes.
Documented causes: No fuel; Faulty fuel solenoid (FS); Harness/wiring issue; Faulty spark plug(s). See the table for the matching fixes.
Documented causes: Plugged or damaged air cleaner; Faulty spark plug(s); Incorrect fuel pressure; Fuel selector in wrong position. See the table for the matching fixes.