The Inverter) is a generator-set controller. It is used on generator sets from BOX, Cummins/Onan, Fast and Generac, including the HDKA, iX 1600, iX 2000 and iX 800.
Used across brands: BOX, Cummins/Onan, Fast, Generac
Also fitted to: BOX R1250IS, BOX R2000IS, BOX R3000IS, Fast K 2800 M-R, Fast K 3500 M-R.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| -01 | Fuel level in coach tanks | Prime genset fuel system | |
| 1 | HIGH TEMPERATURE | (Engine coolant or inverter heat sink temperature exceeded design limit) | Check the second-level fault code by touching Stop. The second-level fault will be either No. 33 or No. 34. |
| 1 flash | High engine coolant temperature. | ||
| 1, 2, 3, or 4 | First level faults | ||
| 11 | OVERCURRENT FAULT | (AC output short) | 1. Turn off the genset line circuit breaker. If the genset no longer shuts down, the genset is probably okay—check for and repair a short circuit in the vehicle appliances, wiring or shorted battery charger transformer. 2. Check whether the vehicle engine and genset share the same starting battery. If so, and this fault occurs when cranking the vehicle engine, low battery voltage may be causing this shutdown. Increase battery capacity or install a separate battery and battery charging system for the genset. |
| 12 | INVERTER OVERVOLTAGE FAULT | Check whether the vehicle engine and genset share the same starting battery. If so, and this fault occurs when cranking the vehicle engine, low battery voltage may be causing this shutdown. Increase battery capacity or install a separate battery and battery charging system for the genset. | |
| 13 | INVERTER UNDERVOLTAGE FAULT | Check whether the vehicle engine and genset share the same starting battery. If so, and this fault occurs when cranking the vehicle engine, low battery voltage may be causing this shutdown. Increase battery capacity or install a separate battery and battery charging system for the genset. | |
| 14 | INVERTER OVERFREQUENCY FAULT | Reduce the number of connected appliances, especially when air conditioners and battery chargers are running. | |
| 15 | INVERTER UNDERFREQUENCY FAULT | 1. Reduce the number of connected appliances, especially when air conditioners and battery chargers are running. 2. Have air conditioners and other appliances checked for proper operation. (A locked compressor rotor can cause very low power factor.) | |
| 19 | GOVERNOR ACTUATOR FAULT | See an authorized Onan dealer. | |
| 2 flashes | Low oil pressure fault (Code 2 fault). | ||
| 22 | GOVERNOR ACTUATOR OVERLOAD FAULT | Reduce the number of connected appliances, especially when air conditioners and battery chargers are running. | |
| 29 | High Battery Voltage | A. Check Battery 1. Check battery bank connections and reconnect if necessary so that the 12 Volt batteries serving the generator set are connected in parallel (12 Volt) rather than in series (24 Volt). 2. Select a lower battery boost charge rate. | |
| 3 | SERVICE CHECK FAULT | (A second-level fault occurred) | Check the second-level fault code by touching Stop. The second-level fault will be one of the following in this table. |
| 3 flashes | Service fault (Code 3 fault). | ||
| 32 | Low Cranking Speed | A. Check Battery 1. Clean and tighten the positive (+) and negative (–) battery cable connections at the battery and at the generator set. 2. Recharge or replace the battery. Refer to the battery manufacturer's recommendations. B. Replace Engine Oil Replace engine oil with oil of proper viscosity for the ambient temperature. NOTICE High oil viscosity can slow down cranking speed. | |
| 33, 44 | Not assigned due to misinterpretation risk | ||
| 35 | Control Card Failure | A. Contact Local Dealer or Distributor | |
| 36 | Engine Stopped | A. Check Fuel Level 1. If fuel level is low, fill the fuel tank. NOTICE The generator set fuel pickup tube could be higher up in the fuel tank than the vehicle engine pickup. 2. Prime the engine fuel system by positioning the control switch to STOP/PRIME for 30 seconds. B. Check Air Filter Element Replace the air filter if dirty. C. Check for Mechanical Damage | |
| 38 | Over Current (Field Overload) | A. Reduce Load Reduce the number of connected appliances, especially air conditioners and battery chargers. | |
| 8 | OVERLOAD | Reduce load and restart | |
| Code 1 | Engine Over Temperature | ||
| Code 12 | Over Voltage | ||
| Code 13 | Under Voltage | ||
| Code 14 | Over Frequency | ||
| Code 15 | Under Frequency | ||
| Code 19 | Governor Actuator | ||
| Code 2 | Low Oil Pressure | ||
| Code 22 | Governor Actuator Overload | ||
| Code 27 | Voltage Sense | ||
| Code 3 | Service Check | ||
| Code 4 | Over Crank | ||
| Fault Code Blinking | Restoring Fault Code Blinking | ||
| NO. 1 | HIGH TEMPERATURE—FAULT CODE NO. 1 (Engine coolant or inverter heat sink temperature exceeded design limit) | Corrective Action: Check the second-level fault code by touching Stop. The second-level fault will be either No. 33 or No. 34. | |
| NO. 11 | OVERCURRENT FAULT—CODE NO. 11 (AC output short) | Corrective Action: 1. Turn off the genset line circuit breaker. If the genset no longer shuts down, the genset is probably okay—check for and repair a short circuit in the vehicle appliances, wiring or shorted battery charger transformer. 2. Check whether the vehicle engine and genset share the same starting battery. If so, and this fault occurs when cranking the vehicle engine, low battery voltage may be causing this shutdown. Increase battery capacity or install a separate battery and battery charging system for the genset. | |
| NO. 12 | INVERTER OVERVOLTAGE FAULT—CODE NO. 12 (Controller not able to regulate to rated voltage) | Corrective Action: Check whether the vehicle engine and genset share the same starting battery. If so, and this fault occurs when cranking the vehicle engine, low battery voltage may be causing this shutdown. Increase battery capacity or install a separate battery and battery charging system for the genset. | |
| NO. 13 | INVERTER UNDERVOLTAGE FAULT—CODE NO. 13 (Controller not able to regulate to rated voltage) | Corrective Action: Check whether the vehicle engine and genset share the same starting battery. If so, and this fault occurs when cranking the vehicle engine, low battery voltage may be causing this shutdown. Increase battery capacity or install a separate battery and battery charging system for the genset. | |
| NO. 14 | INVERTER OVERFREQUENCY FAULT—CODE NO. 14 (Controller not able to regulate to rated frequency) | Corrective Action: Reduce the number of connected appliances, especially when air conditioners and battery chargers are running. | |
| NO. 15 | INVERTER UNDERFREQUENCY FAULT—CODE NO. 15 (Controller not able to regulate to rated frequency) | Corrective Action: 1. Reduce the number of connected appliances, especially when air conditioners and battery chargers are running. 2. Have air conditioners and other appliances checked for proper operation. (A locked compressor rotor can cause very low power factor.) | |
| NO. 19 | GOVERNOR ACTUATOR FAULT—CODE NO. 19 (Controller sensed open or short circuit) | Corrective Action: See an authorized Onan dealer. | |
| NO. 2 | LOW OIL PRESSURE—FAULT CODE NO. 2 (Low oil pressure cutoff switch did not open) | Corrective Action: 1. Check engine oil level and add oil as necessary (Page 15). 2. Drain excess oil (above dipstick Full mark). | |
| NO. 22 | GOVERNOR ACTUATOR OVERLOAD FAULT—CODE NO. 22 (Duration of operation at or near full-duty cycle beyond design limit) | Corrective Action: Reduce the number of connected appliances, especially when air conditioners and battery chargers are running. | |
| NO. 23 | LOW OIL PRESSURE CUTOFF SWITCH FAULT | Corrective Action: See an authorized Onan dealer. | |
| NO. 23 | LOW OIL PRESSURE CUTOFF SWITCH FAULT—CODE NO. 23 (Controller sensed switch still open during start—not a running fault) | Corrective Action: See an authorized Onan dealer. | |
| NO. 24 | COOLANT TEMPERATURE SENDER FAULT | Corrective Action: See an authorized Onan dealer. | |
| NO. 24 | COOLANT TEMPERATURE SENDER FAULT—CODE NO. 24 (Controller did not sense temperature change during first 5 minutes of operation) | Corrective Action: See an authorized Onan dealer. | |
| NO. 25 | ENGINE ABOVE SPEED TARGET FAULT | Corrective Action: See an authorized Onan dealer. | |
| NO. 25 | ENGINE ABOVE SPEED TARGET FAULT—CODE NO. 25 (Governor unable to regulate to target speed) | Corrective Action: See an authorized Onan dealer. | |
| NO. 26 | ENGINE BELOW SPEED TARGET FAULT | Corrective Action: 1. Reduce the number of connected appliances, especially when air conditioners and battery chargers are running. 2. Prime the engine fuel system by holding the control switch down in its Stop position for at least 1 minute. | |
| NO. 26 | ENGINE BELOW SPEED TARGET FAULT—CODE NO. 26 (Governor unable to regulate to target speed) | Corrective Action: 1. Reduce the number of connected appliances, especially when air conditioners and battery chargers are running. 2. Prime the engine fuel system by holding the control switch down in its Stop position for at least 1 minute. | |
| NO. 27 | PMA SENSE LOST FAULT | Corrective Action: See an authorized Onan dealer. | |
| NO. 27 | PMA SENSE LOST FAULT—CODE NO. 27 (Controller unable to sense PMA frequency) | Corrective Action: See an authorized Onan dealer. | |
| NO. 28 | DC SENSE LOST FAULT | Corrective Action: Open the circuit breaker. If the fault does not persist, check for and disconnect excessive loads from the genset before starting. | |
| NO. 28 | DC SENSE LOST FAULT—CODE NO. 28 (Controller unable to sense DC bus voltage) | Corrective Action: Open the circuit breaker. If the fault does not persist, check for and disconnect excessive loads from the genset before starting. | |
| NO. 29 | HIGH BATTERY VOLTAGE FAULT | Corrective Action: 1. Check battery bank connections and reconnect if necessary so that the 12 volt batteries serving the genset are connected in parallel (12 volt) rather than in series (24 volt). 2. Select a lower battery booster charge rate. | |
| NO. 29 | HIGH BATTERY VOLTAGE FAULT—CODE NO. 29 (Voltage across battery system greater than 17.5 volts) | Corrective Action: 1. Check battery bank connections and reconnect if necessary so that the 12 volt batteries serving the genset are connected in parallel (12 volt) rather than in series (24 volt). 2. Select a lower battery booster charge rate. | |
| NO. 3 | SERVICE CHECK FAULT—CODE NO. 3 (A second-level fault occurred) | Corrective Action: Check the second-level fault code by touching Stop. The second-level fault will be one of the following in this table. | |
| NO. 31 | OVERSPEED FAULT | Corrective Action: See an authorized Onan dealer. | |
| NO. 32 | LOW CRANKING SPEED FAULT | Corrective Action: 1. Replace Fuse F2 (starter solenoid) if blown (Page 7). 2. Clean and tighten the positive (+) and negative (−) battery cable connections at the battery and at the genset (Page 17). 3. Recharge or replace the battery. Refer to the battery manufacturer’s recommendations. 4. Replace the engine oil with oil of proper viscosity for the ambient temperature (Page 16). (High oil viscosity can slow cranking speed.) | |
| NO. 33 | HIGH ENGINE COOLANT TEMPERATURE FAULT | Corrective Action: 1. Check the engine coolant level and add coolant and repair leaks as necessary (Page 20). 2. Check for and remove any objects blocking the air inlet or outlet openings in the bottom of the genset. 3. Reduce the number of appliances connected at the same time. (Note that high altitude and high ambient temperature decrease engine cooling capacity.) 4. Clean and flush the cooling system to remove coolant passage fouling. 5. If the genset overheats only underway, see the coach manufacture regarding air baffles or other means to direct cooling air into the genset. |
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.