Troubleshooting - Generac Power Systems NP-66LPG Series Owner's Manual

TROUBLESHOOTING POINTS
PROBLEM CAUSE CORRECTION
Engine won't crank. 1. 15 amp fuse blown. 1. Replace fuse.
2. Loose or corroded or defective 2. Tighten, dean or replace
battery cables as necessary.
3. Defective starter contactor. 3. Replace contactor.
4. Defective starter motor. 4 Replace starter motor.
5. Battery is discharged or defective. 5. Recharge or replace battery.
6. Defective Controller Circuit Board 6. Replace defective circuit board.
Engine cranks but wont start
Engine starts hard, runs rough.
Engine starts, shuts down when
Start/Stop switch is released.
No AC output from generator.
1. Out of fuel.
2. Fuel shutoff valve to RV fuel system
(if so equipped) is closed.
3. Engine is flooded.
4. Defective Controller Circuit Board
5. Spark plugs defective.
6. Defective ignition magneto on engine.
7. Bad carburetor.
8. Dirty engine air cleaner filter.
1. Dirty engine air cleaner filter.
2. Defective spark plugs.
3. Defective ignition magneto on engine.
1. Engine oil level is low.
2. Defective Controller Circuit Board.
3. Defective Low Oil Pressure Switch
4. Loss of generator AC-output.
1. Check main line circuit breaker.
2. Transfer switch (if so equipped) is set
to wrong position.
3. Failure in vehicle electrical system.
4. Generator component failure.
1. Replenish fuel tank.
2. Open fuel shutoff valve.
3. Wait 5-10 minutes; try again.
4. Replace defective circuit board.
5. Clean, regap or replace plugs.
6. Replace, if defective.
7. Adjust, repair or replace.
8. Clean or replace filter as needed.
1. Clean or replace filter as needed.
2. Clean, regap or replace plugs.
3. Replace, if defective.
1. Check oil and add oil as needed.
2. Replace if defective.
3. Replace defective switch.
4. Contact an authorized service
facility.
1. Reset to ON or CLOSED.
2. Reset transfer switch.
3. See vehicle manual.
4. Contact an authorized service
facility.
Recreational Vehicle Generator