Generac In Line 4 troubleshooting: 10 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Generac In Line 4 — full specs, parts & maintenance.
| Symptom | Cause | Remedy |
|---|---|---|
| Display Reads: Press ENTER to begin the activation process. | If ESCAPE is pressed instead of ENTER, your generator will only run in manual mode (for test purposes) and NOT ACTIVATED will be displayed. You will need to remove the generator control panel fuse AND disconnect the T1, N1 and N2 connector in the external connection box (if equipped); or disconnect utility input (main breaker) to the transfer switch for 3-5 seconds and reconnect, then begin with Step 1. | |
| Display Reads: Use ARROW keys to scroll and find the first number of your Activation Code. Press ENTER to select. | Repeat this step until all digits have been entered. Use ESCAPE to correct previous digits. | |
| Display Reads: Activation is complete when all digits are entered above and your screen shows this display. | Follow the controller prompts to continue setting the time function. Refer to your Owner’s Manual with questions. | |
| What happens if “Wrong Passcode Try Again” appears? | Re-enter the activation code. If a second attempt is unsuccessful, check the number against the code given on activategen.com. If it is correct and the generator will not accept it, contact 1-888-9ACTIVATE (922-8482). | |
| Engine won’t crank. | 1. Control panel 7.5 amp fuse blown. 2. Loose or corroded or defective battery cables. 3. Defective starter contactor. 4. Defective starter motor. 5. Dead or Defective Battery. | 1. Replace fuse.* 2. Tighten, clean or replace battery cables as necessary.* 3. Replace contactor.* 4. Replace starter motor.* 5. Remove, change or replace battery.* |
| Engine cranks but won’t start. | 1. Out of fuel. 2. Fuel solenoid (FS) is defective. 3. Spark plugs defective. | 1. Replenish fuel/turn on fuel valve. 2. Replace solenoid.* 3. Clean, regap or replace plugs. |
| Engine starts hard, runs rough. | 1. Air cleaner plugged or damaged. 2. Defective spark plugs. 3. Fuel pressure incorrect. 4. Insufficient fuel supply. 5. Fuel system set to wrong fuel type. | 1. Clean or replace as needed. 2. Clean, regap or replace plugs. 3. Confirm fuel pressure to regulator is as recommended in SPECIFICATIONS.* 4. Confirm fuel pressure to regualtor is as recommended in SPECIFICATIONS.* 5. Reconfigure the fuel system. (See RECONFIGURING THE FUEL SYSTEM in manual.*) |
| Engine starts then shuts down. | 1. Engine oil level is low. 2. Engine is overheated. 3. Defective Low Oil Pressure Switch 4. Defective Coolant Temperature Switch 5. Defective Control Module circuit board. 6. Coolant Level is Low. 7. Defective Low Coolant Level Switch. | 1. Check oil and add oil as needed. 2. Check cooling system for leaks. 3. Replace switch.* 4. Replace switch.* 5. Replace board.* 6. Repair leak - Add coolant. 7. Replace Switch.* |
| AUTO/OFF/MANUAL Switch at OFF, engine continues to run. | 1. Defective AUTO/OFF/MANUAL switch 2. Defective Control Module circuit board | 1. Replace board.* 2. Replace board.* |
| No AC output from generator. | 1. Main line circuit breaker is tripped/open. 2. Generator internal failure. 3. Thermal circuit breaker open. | 1. Reset to ON/CLOSED. 2. * 3. Auto-reset - Wait 5 min. and attempt restart.*Contact the nearest Dealer for assistance. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: 1. Control panel 7.5 amp fuse blown. 2. Loose or corroded or defective battery cables. 3. Defective starter contactor. 4. Defective starter motor. 5. Dead or Defective Battery.. See the table for the matching fixes.
Documented causes: 1. Out of fuel. 2. Fuel solenoid (FS) is defective. 3. Spark plugs defective.. See the table for the matching fixes.
Documented causes: 1. Air cleaner plugged or damaged. 2. Defective spark plugs. 3. Fuel pressure incorrect. 4. Insufficient fuel supply. 5. Fuel system set to wrong fuel type.. See the table for the matching fixes.