The Engine Circuit Board is a generator-set controller. It is used on generator sets from Generac, including the IM100G, IM80G, NP100G and NP80G.
| Symptom | Cause | Remedy |
|---|---|---|
| Voltage and frequency are both good | Engine governor problem (governed speed too high or too low) | Test and adjust engine governor |
| Voltage and frequency read 'zero' | Check sensing leads, voltage regulator; repair or replace as necessary | |
| Voltage is low, but AC frequency is good | Often caused by performing a “Fixed Excitation” test |
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.