The APM603 is a generator-set controller. It is used on generator sets from Doosan and Kohler, including the 100REOZJF, 150REOZJF, 180REOZJG and 200REOZJF.
Used across brands: Doosan, Kohler
Also fitted to: Doosan 250-500RZX_/REZX_, Kohler 80-500REOZJ_, Kohler G6-162 (APM603).
| Code | Meaning | Remedy |
|---|---|---|
| 32 | High Coolant Temperature | |
| 32A | Emergency Stop | Reset the emergency stop switch. |
| 40 | Pre High Coolant Temp. | |
| 41 | Pre Low Oil Pressure | Check and adjust oil level or replace oil pump. |
| 48 | Emergency Stop | |
| 503 | Engine Over Speed | Reduce engine load or check for mechanical issues. |
| 601 | Generator Over Temperature | Cool down generator and monitor temperature. |
| 62 | Low Battery Volts | |
| 63 | Low Fuel | Refuel the generator set. |
| M3.212 | APM INTERNAL power BATTERY WARNING |
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.