The Opcional APM403 is a generator-set controller. It is used on generator sets from Kohler, including the KDI 1903 M.
| Symptom | Cause | Remedy |
|---|---|---|
| Blue smoke | High oil sump level | Replace the engine oil; if the problem persists, contact KOHLER authorised workshops |
| Engine jerking | Clogged fuel pipes | Contact KOHLER authorised workshops |
| Engine lost its initial performance | Clogged air filter | Replace with a new filter |
| Engine overheats | Insufficient coolant level | Fill up to the level |
| Engine starts but stops | Inefficient electrical connections | Clean the electrical contacts; if the problem persists, contact KOHLER authorised workshops |
| Excessive fuel consumption | High oil sump level | Replace the engine oil; if the problem persists, contact KOHLER authorised workshops |
| Low idle speed | Clogged fuel pipes | Contact KOHLER authorised workshops |
| Poor quality fuel | Clean the tank and refuel with quality fuel | |
| RPM instability at idle speed | Clogged fuel pipes | Contact KOHLER authorised workshops |
| Slow acceleration | Clogged fuel filter | Replace the fuel filter |
| The engine does not start | Sulphated battery terminals corroded | Clean the battery terminals |
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.