Kohler 15RMY troubleshooting: 21 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Kohler 15RMY — full specs, parts & maintenance.
| Symptom | Cause | Remedy |
|---|---|---|
| Battery and A.D. lamps of Fast Check should light if red (+) and black (-) harness leads are properly connected | Check wiring to 1CR, replace uni-board | |
| CRK. lamp alone does not light (voltage not conducted to starter circuit) | Replace uni-board, fix 1CR relay wiring or replace relay | |
| No or low AC output | Blown fuse on sensing leads V7, V8 and V9; regulator board or SCR module overcurrent condition; exciter field issue; controller issue; stator winding problem; rotor resistance or ground issue. | Check for blown fuses. Check controller and exciter field. Inspect stator windings, rotor resistance, and grounding. |
| Generator Set will stop. | 3-Amp fuse 'blows'. | Check fuse. If blown, replace the fuse and attempt to restart generator set. |
| Unit will not crank with a blown 15-Amp fuse. | Blown 15-Amp fuse due to overcurrent in CR and 1CR relay contacts from a short in the wiring or engine accessories. | If this fuse blows while the generator set is running, the unit will shut down. |
| No AC output. | Unbalanced stator windings or no continuity between 'quick disconnect' point on each brush lead and its adjacent slip ring. | Check for continuity. Repair or replace assembly if fault is detected. |
| Battery voltage switched to starter (engine not necessarily turning). | Lights only during ‘‘on-crank’' cycles. | |
| CR relay coil energized. | Deenergizes C relay | |
| 1TS contacts in series with CR relay open to stop cranking (or stop unit if started and producing no AC output). | The overcrank reset switch must be activated to reset 1TS contacts. | |
| CR relay energized. | Initiates cranking, Energizes ignition circuit, Energizes 1TS circuit, Energizes primary field, Energizes hourmeter, Energizes anti-diesel solenoid (Gasoline only), Energizes water valve (city-water cooled only), Energizes choke (Gasoline only), Energizes gas valve (Gasoline only) | |
| SDR relay energized. | Locks in SDR relay, Energizes reset lamp, Deenergizes CR coil | |
| Fuse blown. | If set has stopped due to causes other than lack of fuel, or fault shut-down — check fuse. If blown, replace the fuse and attempt to restart generator set. | |
| Overspeed simulated. | Engine overspeed | |
| Low fuel simulated. | L.F. — low fuel | |
| Low engine water temperature simulated. | L.W.T. — low engine water temperature | |
| Anticipatory (low) oil pressure simulated. | A.O.P. — anticipatory (low) oil pressure | |
| Anticipatory (high) water temperature simulated. | A.W.T. — anticipatory (high) water temperature | |
| Low oil pressure simulated. | L.O.P. — low oil pressure | |
| High water temperature simulated. | H.W.T. — high water temperature | |
| Generator set stopped due to blown fuse. | If the set will not start, or if the fuse blows again, locate and correct the cause. | |
| No or low AC output. | Unbalanced stator windings or no continuity between 'quick disconnect' point on each brush lead and its adjacent slip ring. | Check for continuity. Repair or replace assembly if fault is detected. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Blown fuse on sensing leads V7, V8 and V9; regulator board or SCR module overcurrent condition; exciter field issue; controller issue; stator winding problem; rotor resistance or ground issue.; Unbalanced stator windings or no continuity between 'quick disconnect' point on each brush lead and its adjacent slip ring.. See the table for the matching fixes.
Documented causes: 3-Amp fuse 'blows'.. See the table for the matching fixes.
Documented causes: Blown 15-Amp fuse due to overcurrent in CR and 1CR relay contacts from a short in the wiring or engine accessories.. See the table for the matching fixes.