The Cummins/Onan KTT52 is an engine. It powers generator sets from Cummins/Onan, including the 12800FMB and 15000FMB.
| Code | Meaning | Remedy |
|---|---|---|
| FAULT 1 or FAULT 2 | The FAULT 1 or FAULT 2 fault lamp lights. Engine shuts down immediately, or engine continues to run. | A. Fault lamp on. Correct fault and reset control. b. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. c. Discharged or defective battery. Recharge or replace the battery. |
| Symptom | Cause | Remedy |
|---|---|---|
| Green RUN lamp lights following engine loads and cannot be shut down | A. Reduce load if possible by turning off non-critical loads. b. Check air inlets and outlets and remove any obstructions to airflow. c. Open doors or windows in generator area to increase ventilation. Allow engine to cool down completely before proceeding with the following checks: a. Check coolant level and replenish if low. Look for possible coolant leakage points and repair b. Check for obstructions to cooling airflow and correct as necessary. c. Check for a slipping fan belt and tighten if required. d. Reset control and restart after locating and correcting problem. Contact your Dealer or Distributor if none of the above. | |
| OVERCRANK lamp lights and engine cannot be started | A. Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required. d. Refer to Step 5. | |
| Engine runs and then shuts down, OVERSPEED lamp lights | A. Check for low coolant level and replenish if required. Look for possible coolant leakage points and repair as required. b. Contact your Dealer or Distributor if none of the above. | |
| Engine shutdown and Hi Engine Temp fault lamp lights | Submerged sensor in the top portion of the radiator with coolant level below sensor level | |
| Overcrank fault | Place Run/Stop/Remote switch in STOP position, depress Reset switch momentarily, wait two minutes for starter motor to cool and repeat starting procedure |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
The Cummins/Onan KTT52 powers 2 generator set(s), including Cummins/Onan 12800FMB, Cummins/Onan 15000FMB.