The RDC Residential Digital; DC Digital is a generator-set controller. It is used on generator sets from Kohler, including the 14RES and 20RES.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| Accy PwrOver Warning | Accy PwrOver Warning | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service |
| Accy PwrOver Warning | Accy PwrOver Warning — controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service | |
| Emerg Stop Shutdwn | Emerg Stop Shutdwn | Remote emergency stop button activated or shutdown (prime mover) switch turned to the off (open, O) position | Reset the remote emergency stop switch(es) and reset the controller by pressing the OFF/RESET button; Press I on the shutdown switch to allow the engine to start and run |
| LossOfComm2 | Communication Lost with Secondary Controller | ||
| MainPwrOverL Shutdown | MainPwrOverL Shutdown | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service |
| MainPwrOverL Shutdown | MainPwrOverL Shutdown — controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service |
| 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. |
| Controller display backlight is off | Backlight turns off after about 1 minute with no activity | Backlight will turn on when a button is pressed or the generator set starts |
| Controller display is off | Low or no battery voltage | Check connections; Check generator set battery |
| Generator set stops suddenly | Low oil pressure shutdown | Check for oil leaks. Check the oil level and add oil if necessary |
| Generator will shut down and the controller will display a fault (underspeed, underfrequency, or undervoltage) | Thermostat detects excess heat inside the enclosure; blocked air inlets and exhaust outlets | Check for blocked air inlets and exhaust outlets; reset the thermostat |
| Low output or excessive drop in voltage | Generator set overloaded | Reduce the load |
| No AC output | Line circuit breaker in the OFF position | Place the circuit breaker in the ON position |
| Overcrank fault | Generator set does not start in three crank attempts (three crank cycles, 15 seconds crank and 15 seconds off) | |
| The generator set cranks but does not start, starts hard, lacks power, or operates erratically | Air cleaner clogged | Clean and/or replace the air cleaner |
| The generator set does not crank | Battery weak or dead | Recharge or replace the battery |
| Underspeed, underfrequency, or undervoltage fault | Enclosure thermostat tripped due to excess heat inside the enclosure | Check for blocked air inlets and exhaust outlets; Reset the thermostat |
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.