Kohler 18RCAL troubleshooting: 9 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Kohler 18RCAL — full specs, parts & maintenance.
| Symptom | Cause | Remedy |
|---|---|---|
| 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. See the Service Views section. |
| The generator set does not crank. | Battery weak or dead. | Recharge or replace the battery. Make sure that the AC power to the generator set controller is backed up by the generator set. |
| 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. |
| No AC output. | Line circuit breaker in the OFF position. | Place the circuit breaker in the ON position. |
| Auxiliary winding circuit breaker tripped. | Reset the circuit breaker (located in controller’s service access area). Contact an authorized dealer for service if breaker trips repeatedly. | |
| Low output or excessive drop in voltage. | Generator set overloaded. | Reduce the load by unplugging non-essential appliances. |
| Generator set stops suddenly. | Low oil pressure shutdown. | Check for oil leaks. Check the oil level and add oil if necessary. |
| Generator thermostat tripped. | Check for obstructed air inlets and outlets. Reset the thermostat. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Backlight turns off after about 1 minute with no activity.. See the table for the matching fixes.
Documented causes: Low or no battery voltage.. See the table for the matching fixes.
Documented causes: Battery weak or dead.. See the table for the matching fixes.