The Energy Command 20 is a generator-set controller. It is used on generator sets from Cummins/Onan, including the EC-20.
| Symptom | Remedy |
|---|---|
| The genset stops | Does the genset operate correctly from the genset controls? If it does not, the problem is in the genset, not the EC-20 controller. See the genset Operator, Installation, and Service Manuals. |
| The indicator light in the Start/Stop switch turns off | Confirm that the correct connection diagram (Figures 5 - 7) was used, then check EC 30 wiring connections. Confirm that the correct voltages are present on each terminal. Check all terminal connections on both ends of the wiring harness. Are harness connectors properly joined? |
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.