The EC-AGS+ is a generator-set controller. It is used on generator sets from Cummins/Onan, including the HDKA, HDKB, HDKC and HGJAA.
Also fitted to: Cummins/Onan K.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| -01 | Fuel level in coach tanks | Prime genset fuel system | |
| 1 | ENGINE OVER TEMPERATURE—CODE NO. 1 (During normal operation engine coolant temperature exceeded 239° F [115° C] for 10 seconds) | 1. Check engine coolant level, add coolant as necessary and repair any leaks. 2. Check for and remove any objects blocking the air inlet or outlet openings in the bottom of the genset and clean out dirt fouling the radiator passages. 3. Run fewer appliances at the same time to keep down engine temperature. (Note that high altitude and high ambient temperature decrease engine cooling capacity.) 4. Look for loose or broken fan belts and have them serviced. | |
| 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 | High engine coolant temperature. | ||
| 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. | |
| 12 | Overvoltage | ||
| 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. | |
| 13 | Undervoltage | ||
| 14 | INVERTER OVERFREQUENCY FAULT | Reduce the number of connected appliances, especially when air conditioners and battery chargers are running. | |
| 14 | Overfrequency | ||
| 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.) | |
| 15 | Underfrequency | ||
| 17 | Fuel Pump Fault | ||
| 19 | GOVERNOR ACTUATOR FAULT | See an authorized Onan dealer. | |
| 19 | Governor Actuator (EFI Only) | ||
| 2 | LOW OIL PRESSURE—CODE NO. 2 (During normal operation engine oil pressure dropped to less than 14 psi for 3 seconds—switch closed) | 1. Check engine oil level, add oil as necessary and repair any leaks. 2. Drain the excess oil if the level is above Full on the dipstick. If the level is too high the crankshaft can whip the oil into foam, which the pump can’t pump. | |
| 2 | Low Oil Pressure Fault | ||
| 2 | Low oil pressure fault. | ||
| 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. | |
| 22 | Governor Actuator Overload (EFI Only) | ||
| 23 | Oil Pressure Switch Fault | ||
| 27 | Voltage Sense Lost | ||
| 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 | SERVICE CHECK—CODE NO. 3 (A second-level fault occurred) | Check the second-level fault code by momentarily pressing Stop. The second-level fault will be one of the following in this table. | |
| 3 | Service Check Fault | ||
| 3 | Service fault. | ||
| 3 flashes | Service fault (Code 3 fault). | ||
| 31 | Overspeed 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. | |
| 32 | Low Cranking Speed Sense | ||
| 33 | Fault Code 3 - Fault Code 33 | ||
| 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 | |
| 36 | Generator Set Stopped Without Fault Condition | ||
| 36 | Generator Set Stopped Without Fault Condition - Fault Code 36 | ||
| 37 | Invalid Set Configuration | ||
| 38 | During normal voltage regulation Field Voltage exceeded 180 VAC for 10 seconds | 1. Reduce the number of air conditioners running at the same time, and other appliances that cause low power factor. (The lower the power factor of a motor or compressor, the more current it draws per kilowatt. The genset Controller, in turn, must boost field voltage to meet the higher demand for current imposed by low power factor.) 2. Have the air conditioners and other appliances checked for proper operation. (A locked compressor rotor can cause a very low power factor.) | |
| 38 | Field Overload (Overvoltage) | ||
| 38 | Over Current (Field Overload) | A. Reduce Load Reduce the number of connected appliances, especially air conditioners and battery chargers. | |
| 4 | Cranking exceeded 30 seconds without the engine starting. | ||
| 4 | Overcrank | ||
| 4 | THE STARTER ENGAGES AND DISENGAGES (Low cranking voltage) | 1. Have the vehicle propulsion engine running while trying to start the genset. Its charging alternator may be able to maintain a high enough battery terminal voltage to start the genset. 2. Service the battery as necessary by cleaning and tightening connections, recharging or replacing the battery or replacing damaged battery cables. | |
| 41 | Alternator Rotor Fault | ||
| 41 | While field flashing during cranking, the Controller sensed that the rotor circuit was shorted to ground | See an authorized Onan dealer. | |
| 42 | During startup the genset Controller detected a ROM memory error | See an authorized Onan dealer. | |
| 42 | Processor Fault | ||
| 42 | Processor Fault - Fault Code 42 | ||
| 43 | During startup the genset Controller detected a RAM memory error | See an authorized Onan dealer. | |
| 43 | Processor Fault - Fault Code 43 | ||
| 45 | After start disconnect the Controller lost speed sense [quadrature zero crossings] for 0.25 seconds | See an authorized Onan dealer. | |
| 45 | Speed Sense Fault | ||
| 47 | Ignition Fault | ||
| 48 | Field Sense Fault | ||
| 51 | Processor Failure |
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.