The DC2 is a generator-set controller. It is used on generator sets from Kohler, including the 10RESV, 12RESV, 14RES and 20RES.
Also fitted to: Kohler 20RESA/20RESAL/20RESC/RESCL, Kohler RESA/RESAL.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| EnpowerGeneratorVoltHighTrip OR EnpowerGeneratorVoltLowTrip OR EnpowerGeneratorFreqHighTrip OR EnpowerGeneratorFreqLowTrip | Generator voltage and/or frequency out of spec while in generator mode and generator is connected | The generator gets disconnected | |
| Faults Related to Paralleling | Issues arise when paralleling the generator with other systems or units. | ||
| GenTHDHigh | High Total Harmonic Distortion (THD) Measured THD is above 25% | Generator power output is not stable and having high THD (THD means total harmonic distortion, which is a metric to measure the power quality. If the THD is high, the performance of your electronics will be affected; for example, you may see flickering lights). | |
| GeneratorStartFailed | Generator not starting | The generator does not start as selected in user preferences. | Check if the generator 2-wire start/stop wiring to IQ System Controller is loose. Check whether the generator breaker at the unit was tripped (if so turn the breaker off and then on. Also switch the controller to the auto position), whether the generator is out of fuel, or the starting battery of the generator was dead. Contact your installer or Enphase customer support if the problem persists. |
| GeneratorStopFailed | Generator not stopping | Generator continues to run even though user preferences indicate it should have stopped. | Check if the generator 2-wire start/stop wiring to IQ System Controller is loose. Turn off the generator manually and contact installer or Enphase customer support. |
| GeneratorVoltageImbalance OR GeneratorComBusPhaseDifferenceOOR | Generator was overloaded. | Generator breaker in IQ System Controller tripped, and the generator is disconnected. | The system will try to reconnect the generator in 5 minutes. You should: • Open IQ System Controller door, turn off the generator breaker and turn it on again. (When you open IQ System Controller, the generator breaker lever will not be in ON position) • Ensure you do not overload the system while the generator is running. |
| LossOfComm2 | Communication Lost with Secondary Controller | ||
| Main Power Overload Shutdown | The generator shuts down due to a main power overload condition. |
| Symptom | Cause | Remedy |
|---|---|---|
| Battery short circuits | Disconnect the battery before generator set installation or maintenance. Remove all jewelry before servicing the equipment. Use tools with insulated handles. Remove the negative (--) lead first when disconnecting the battery. Reconnect the negative (--) lead last when reconnecting the battery. | |
| Bodily injury and/or equipment damage | Battery short circuits | Disconnect the battery before generator set installation or maintenance. Remove all jewelry before servicing the equipment. Use tools with insulated handles. Remove the negative (--) lead first when disconnecting the battery. Reconnect the negative (--) lead last when reconnecting the battery. Never connect the negative (--) battery cable to the positive (+) connection terminal of the starter solenoid. Do not test the battery condition by shorting the terminals together. |
| Engine does not start | Low oil pressure or oil level | Check and refill oil if necessary. Refer to the 'Oil Check' section for details. |
| Engine overheats | Coolant level is low or coolant is contaminated | Check and refill coolant if necessary. Refer to the 'Cooling System' section for details. |
| Fire | Battery short circuits can cause bodily injury and/or equipment damage. | Disconnect the battery before generator set installation or maintenance. Remove all jewelry before servicing the equipment. Use tools with insulated handles. Remove the negative (-) lead first when disconnecting the battery. Reconnect the negative (-) lead last when reconnecting the battery. |
| Generator produces low voltage output | Dirty air filter | Clean the air filter as per the instructions in the 'Air Cleaner Service' section. |
| Severe electrical equipment damage | Welding components of the generator set without disconnecting battery, controller wiring harness, and engine electronic control module (ECM) | Never weld components of the generator set without first disconnecting the battery, controller wiring harness, and engine electronic control module (ECM). |
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.