The Decision-Maker 3000 is a generator-set controller. It is used on generator sets from General Motors and Kohler, including the GZ25, 100ERES, 100ERESD-QS and 100ERESD-QS1.
Used across brands: General Motors, Kohler
Also fitted to: Kohler 80/100REZGC, Kohler G4-200 (80ERESD).
| Symptom | Cause | Remedy |
|---|---|---|
| Engine overheats | Coolant level is low, thermostat is faulty, radiator fins are dirty | Add coolant to recommended level. Replace thermostat if it is faulty. Clean radiator fins. |
| Engine runs rough | Air intake system is dirty, fuel solenoid is faulty | Inspect and clean air intake system. Check and replace fuel solenoid if necessary. |
| Generator does not start | Faulty starter motor or battery | Check and replace the starter motor if necessary. Check and charge the battery. |
| Generator produces insufficient power | Fuel filter is clogged, governor settings are incorrect | Clean or replace the fuel filter. Adjust governor settings as per manufacturer's instructions. |
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.