The SYNC2 HSB is a generator-set controller. It is used on generator sets from Generac, including the G0070420.
Also fitted to: Generac 11 kW, Generac 16 kW, Generac 20 kW, Generac 22 kW, Generac 9 kW.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 0 | Utility failure | Crank and start engine, transfer load to Generator if Utility returns above 75% nominal for 15 seconds | |
| 1 | Engine won’t crank. | ||
| 10 | Defective Low Coolant Level Switch | ||
| 11 | Defective AUTO/OFF/MANUAL switch | ||
| 1100 | Overcrank — Condition - Engine Cranks but will not Start | Unit turns over but will not start. Controller is receiving signal on Wire 18. | Problem 17 |
| 1100 | Overcrank — Condition - Engine Cranks but will not Start (5 crank attempts). Unit turns over but will not start. Controller is receiving signal on Wire 18. | Problem 17 | |
| 1101 | Overcrank — Engine/Starter Problem | Limiting number of cranking cycles to protect the starter motor. If the engine has tried to crank for 10 times unsuccessfully, this will trigger. | |
| 1101 | Overcrank — Engine/Starter Problem. Limiting number of cranking cycles to protect the starter motor. | If the engine has tried to crank for 10 times unsuccessfully, this will trigger. | |
| 12 | Open/disconnected wire #15A between AUTO/OFF/MANUAL switch and Control Module circuit board. | ||
| 1200 | Overspeed — ALARM | Prolonged (60 Hz on a 50 Hz unit, 72Hz on 60Hz unit) over specified Hz for 3 seconds. Possible cause: Stepper motor/mixer body assembly issue | Test 12 |
| 1200 | Overspeed — Prolonged | Over 72 Hz for 3 seconds. Possible cause: Stepper motor/mixer body assembly issue. | Test 12 |
| 1200 | Overspeed — Prolonged (60 Hz on a 50 Hz unit, 72Hz on 60Hz unit) Over specified Hz for 3 seconds. | Stepper motor/mixer body assembly issue | Test 12 |
| 1205 | Overspeed — ALARM | Instantaneous (62 Hz on a 50 Hz unit, 75Hz on 60Hz unit) over specified Hz for 0.1 second (100 milliseconds). Possible cause: Stepper motor/mixer body assembly issue | Test 12 |
| 1205 | Overspeed — Instantaneous | Over 75 Hz for .1 second (100 milliseconds). Possible cause: Stepper motor/mixer body assembly issue. | Test 12 |
| 1205 | Overspeed — Instantaneous (62 Hz on a 50 Hz unit, 75Hz on 60Hz unit) Over specified Hz for 0.1 second (100 milliseconds). | Stepper motor/mixer body assembly issue | Test 12 |
| 1207 | Overspeed — ALARM | Monitors zero cross timing of the AVR to determine the alternator frequency which is a speed indicator. Set for 150 milliseconds of 4500 rpm or higher. Used if the normal ignition pulse sequence(s) are not being seen by the controller | Test 64 and Test 60 |
| 1207 | Overspeed — Monitors zero cross timing of the AVR to determine the alternator frequency which is a speed indicator. Set for 150 milliseconds of 4500 rpm or higher. Used if the normal ignition pulse sequence(s) are not being seen by the controller. | Test 64 and Test 60 | |
| 13 | Engine starts then shuts down. | ||
| 1300 | Low Oil Pressure — ALARM | Occurred while running. The default Extended alarm for low oil pressure | Check oil level and pressure |
| 1300 | Low Oil Pressure — Occurred while running | The default Extended alarm for low oil pressure. | Check oil level and pressure. Test 61 |
| 1300 | Low Oil Pressure — Occurred while running. The default Extended alarm for low oil pressure. | Check oil level and pressure. Test 61 | |
| 1400 | High Temperature — ALARM | Condition - Air Flow Impeded / Flow Issue | Check the inlet/outlet for debris; check temperature sensor and wiring |
| 1400 | High Temperature — Condition - Air Flow Impeded / Flow Issue | Check the inlet/outlet for debris. Check temperature sensor and wiring. Test 62 | |
| 1501 | RPM Sensor — ALARM | Twin Cylinder+Running. Twin Cylinder Running faults to RPM Sensor Loss. Possible Causes: air pocket in fuel line, dirty fuel, missing ignition pulse (loss of one of the primary coils) | Test 50 and Test 64 |
| 1501 | RPM Sensor — Twin Cylinder+Running | Twin Cylinder Running faults to RPM sensor loss. Possible Causes: air pocket in fuel line, dirty fuel, missing ignition pulse (loss of one of the primary coils). | Test 50 and Test 64 |
| 1501 | RPM Sensor — Twin Cylinder+Running. Twin Cylinder Running faults to RPM Sensor Loss. | Air pocket in fuel line; dirty fuel; missing ignition pulse (loss of one of the primary coils) | Test 50 and Test 64 |
| 1505 | RPM Sensor — ALARM | Twin Cylinder+Cranking. Twin Cylinder Cranking faults to RPM sensor loss. Possible Cause: starter motor issue, missing ignition pulse (loss of one of the primary coils) | If engine cranks, Test 64; if engine does not crank, Problem 15 |
| 1505 | RPM Sensor — Twin Cylinder+Cranking | Twin Cylinder Cranking faults to RPM sensor loss Possible Cause: starter motor issue, missing ignition pulse (loss of one of the primary coils). | If engine cranks, Test 64. If engine does not crank, Problem 15. |
| 1505 | RPM Sensor — Twin Cylinder+Cranking. Twin Cylinder Cranking faults to RPM sensor loss. | Starter motor issue; missing ignition pulse (loss of one of the primary coils) | If engine cranks, Test 64. If engine does not crank, Problem 15. |
| 1511 | RPM Sensor — ALARM | Single Cylinder+Running. Single Cylinder Running RPM sensor loss. Possible Causes: air pocket in fuel line, dirty fuel. Loss of ignition pulse | Test 50 and Test 64 |
| 1511 | RPM Sensor — Single Cylinder+Running | Single Cylinder Running with Low Fuel Pressure faults to RPM sensor loss Possible Causes: air pocket in fuel line, dirty fuel. | Test 50 and Test 64 |
| 1511 | RPM Sensor — Single Cylinder+Running. Single Cylinder Running RPM sensor loss. | Air pocket in fuel line; dirty fuel; loss of ignition pulse | Test 50 and Test 64 |
| 1515 | RPM Sensor — ALARM | Single Cylinder+Cranking. Single Cylinder Cranking faults to RPM sensor loss. Possible Cause: starter motor and/or engine issue. Loss of ignition pulse | If engine cranks, Test 64; if engine does not crank, Problem 15 |
| 1515 | RPM Sensor — Single Cylinder+Cranking | Single Cylinder Cranking faults to RPM sensor loss Possible Cause: starter motor issue. | If engine cranks, Test 64. If engine does not crank, Problem 15. |
| 1515 | RPM Sensor — Single Cylinder+Cranking. Single Cylinder Cranking faults to RPM sensor loss. | Starter motor and/or engine issue; loss of ignition pulse | If engine cranks, Test 64. If engine does not crank, Problem 15. |
| 1600 | Underspeed — ALARM | Condition - Unit is Overloaded (55 Hz for 60 Hz for 30 sec, 40 Hz for 50 Hz unit). Unit is Overloaded slowing engine speed, fuel supply low or throttle control problem | Problem 3, or Test 50, or Test 12 |
| 1600 | Underspeed — Condition - Unit is Overloaded | Unit is Overloaded slowing engine speed, fuel supply low or throttle control problem. | Problem 1, Test 50 or Test 12 |
| 1600 | Underspeed — Condition - Unit is Overloaded (55 Hz for 60 Hz for 30 sec, 40 Hz for 50 Hz unit). Unit is Overloaded slowing engine speed. | Fuel supply low; throttle control problem | Problem 3, or Test 50, or Test 12 |
| 1603 | Underspeed | The engine never comes up to 3700 RPM. | Check fuel selection and fuel supply |
| 1603 | Underspeed — The engine never comes up to 3600 RPM. | Check fuel selection and fuel supply | |
| 1800 | Overvoltage — ALARM | Prolonged Over-Voltage | Preliminary Output Voltage Test (firmware v1.12 and above). Note: Update controller to latest firmware |
| 1800 | Overvoltage — Prolonged Over-Voltage | Problem 2; Preliminary Output Voltage Test (firmware v1.12 and above). Note: Update controller to latest firmware. | |
| 1900 | Undervoltage — ALARM | Prolonged Under-Voltage. Undervoltage due to loss of voltage. Below 80% for 10+ seconds | Preliminary Output Voltage Test (firmware v1.12 and above). Note: Update controller to latest firmware |
| 1900 | Undervoltage — Prolonged Under-Voltage | Undervoltage due to loss of voltage for some time (10+ seconds). | Test 5 |
| 1900 | Undervoltage — Prolonged Under-Voltage. Undervoltage due to loss of voltage. Below 80% for 10+ seconds. | Preliminary Output Voltage Test (firmware v1.12 and above). Note: Update controller to latest firmware. | |
| 1901 | Undervoltage — ALARM | Instantaneous. Undervoltage due to sudden loss of voltage. (Voltage less than 15 sec 2 sec+) | Preliminary Output Voltage Test (firmware v1.12 and above). Note: Update controller to latest firmware |
| 1901 | Undervoltage — Instantaneous | Undervoltage due to sudden loss of voltage. | Problem 1 |
| 1901 | Undervoltage — Instantaneous. Undervoltage due to sudden loss of voltage. (Voltage less than 15 sec 2 sec+) | Preliminary Output Voltage Test (firmware v1.12 and above). Note: Update controller to latest firmware. | |
| 1902 | Undervoltage — ALARM | Both Zero Crosses missing. Undervoltage due to faulty excitation winding, or zero cross circuit, or circuit in general. Possible cause: loose wiring, field boost hardware failure. (Both zero cross missing greater than 1.5 sec) | Problem 2 |
| 1902 | Undervoltage — Both Zero Crosses missing | Undervoltage due to faulty excitation winding, or zero cross circuit, or circuit in general. Possible cause: loose wiring, field boost hardware failure | Problem 1 |
| 1902 | Undervoltage — Both Zero Crosses missing. Undervoltage due to faulty excitation winding, or zero cross circuit, or circuit in general. (Both zero cross missing greater than 1.5 sec) | Loose wiring; field boost hardware failure | Preliminary Output Voltage Test (firmware v1.12 and above). Note: Update controller to latest firmware. |
| 1906 | Undervoltage — ALARM | Single Zero Cross missing. Undervoltage due to faulty excitation winding, zero cross circuit, or circuit in general. Possible cause: field boost hardware failure. (One zero cross missing greater than 1.5 sec) | |
| 1906 | Undervoltage — Single Zero Cross missing | Undervoltage due to faulty excitation winding, zero cross circuit, or circuit in general. Possible cause: field boost hardware failure | Problem 1 |
| 1906 | Undervoltage — Single Zero Cross missing. Undervoltage due to faulty excitation winding, zero cross circuit, or circuit in general. (One zero cross missing greater than 1.5 sec) | Field boost hardware failure | Preliminary Output Voltage Test (firmware v1.12 and above). Note: Update controller to latest firmware. |
| 2 | Engine cranks but won't start | ||
| 2099 | Wiring Error | Customer connection low voltage and high voltage wires are crossed. | Check customer connection in generator |
| 2099 | Wiring Error — ALARM | Mis-wired. Customer connection low voltage and high voltage wires are crossed | |
| 2099 | Wiring Error — Mis-wired. Customer connection low voltage and high voltage wires are crossed. | Check customer connection in generator | |
| 2100 | Overload Remove Load | Overloaded - Default (Output Current Method). Unit is overloaded, one of the two CTs is detecting an overload condition. | Check transfer switch loadshed functionality. (Change load dynamics or utilize loadshed). Remove Load |
| 2100 | Overload Remove Load — ALARM | Overloaded - Default (Output Current Method). Unit is overloaded. One or both CT(s) detecting an overload condition | Check transfer switch loadshed functionality. (Change load dynamics or utilize loadshed) |
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.