Generac IM-72 troubleshooting: 9 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Generac IM-72 — full specs, parts & maintenance.
| Symptom | Cause | Remedy |
|---|---|---|
| Engine won't crank. | 1. 15 amp fuse is blown | 1. Replace 15 amp fuse |
| Engine cranks but won't start. | 1. Out of fuel. | 1. Replenish fuel. |
| Engine starts hard, runs rough. | 1. Air cleaner plugged or damaged | 1. Clean or replace as needed. |
| Engine starts, shuts down when Start/Stop switch is released. | 1. Engine oil is low. | 1. Check oil; add as needed. |
| Start/Stop switch at Stop, engine continues to run. | 1. Defective Start/Stop switch | 1. Replace switch. |
| No AC output from generator. | 1. Check circuit breaker. | 1. Reset to ON or CLOSED. |
| Engine starts, shuts down when Start/Stop switch is at Stop, engine continues to run. | 1. Defective Start/Stop switch 2. Open/disconnected wire #18 between Start/Stop switch and Engine Control Bd. 3. Open/disconnected wire #0 between Start/Stop switch & Engine Control Bd. | 1. Replace switch. 2. Reconnect or close wire. 3. Reconnect or close wire. |
| Engine starts, then shuts down. | 1. Engine oil level is low. | 1. Check oil and add as needed. |
| No AC output voltage. | 1. Check circuit breaker. | 1. Reset to ON or CLOSED. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: 1. 15 amp fuse is blown. See the table for the matching fixes.
Documented causes: 1. Out of fuel.. See the table for the matching fixes.
Documented causes: 1. Air cleaner plugged or damaged. See the table for the matching fixes.