Kohler 48RCLB troubleshooting: 17 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Kohler 48RCLB — full specs, parts & maintenance.
| Symptom | Cause | Remedy |
|---|---|---|
| The generator set does not crank. | Battery weak or dead, Battery connections reversed or poor, Blown fuse(s) | Recharge or replace the battery, Check the connections, Replace the fuse. Contact an authorized Kohler distributor/dealer for service if fuse blows repeatedly |
| The generator set cranks but does not start, starts hard, lacks power, or operates erratically. | Air cleaner clogged, Battery weak or dead, Battery connection poor, Spark plug wire connection loose | Clean and/or replace the air cleaner element, Recharge or replace the battery, Clean and tighten the battery connections, Check the spark plug wires |
| Low oil pressure shutdown. | Check for oil leaks. Check the oil level and add oil if necessary | |
| Fuel pressure insufficient. | Check the fuel supply and valves | |
| Engine malfunction. | Contact an authorized Kohler distributor/dealer | |
| No AC output. | AC circuit breaker in the OFF position | Place the circuit breaker in the ON position |
| AC circuit breaker tripping because of overload. | Reduce the load on the generator set by unplugging non-essential appliances | |
| AC circuit breaker tripping because of short circuit. | Contact an authorized Kohler distributor/dealer for service | |
| 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, Out of fuel, Overcrank shutdown, Blown fuse(s), Overspeed shutdown | Check for oil leaks. Check the oil level and add oil if necessary, Check fuel supply, Reset the controller. If the overcrank fault occurs again, contact an authorized Kohler distributor/dealer, Replace the fuse. If the fuse blows again, contact an authorized Kohler distributor/dealer, Reset the controller. If the overspeed fault occurs again, contact an authorized Kohler distributor/dealer |
| Generator set is OFF. | Press the RUN button to start the engine or press AUTO to allow remote starting | |
| Remote stop command received from a remote switch, ATS, or OnCuer. | Check the remote switch position | |
| Fans run after engine shuts down. | The fans continue to run for 2 minutes after the engine shuts down to evacuate the engine compartment | |
| Controller LCD display is off. | Low or no battery voltage | Check connections, Check generator set battery. See Figure 5-1 |
| 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 |
| Load management relays do not operate. | Bad connections | Check wiring and connections. Verify that cable size and length of run comply with the instructions in the Installation manual, Low or no battery voltage |
| Date is flashing. | Controller power was disconnected and then reconnected | Check battery connections. See Figure 5-1, Check utility power connection for the built-in battery charger |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Battery weak or dead, Battery connections reversed or poor, Blown fuse(s). See the table for the matching fixes.
Documented causes: Air cleaner clogged, Battery weak or dead, Battery connection poor, Spark plug wire connection loose. See the table for the matching fixes.
Documented causes: AC circuit breaker in the OFF position. See the table for the matching fixes.