Troubleshooting - Generac Power Systems MC4000 Owner's Manual

TROUBLESHOOTING

Problem
Engine is running, but
no AC output is
available.
Engine runs good but
bogs down when loads
are connected.
Engine will not start; or
starts and runs rough.
Engine shuts down
during operation.
Engine lacks power.
Engine "hunts" or
falters.
Generac Portable Products MC4000 Generator
Cause
1. Circuit breaker is open.
2. Poor connection or defective cord set.
3. Connected device is bad.
4. Fault in generator.
1. Short circuit in a connected load.
2. Generator is overloaded.
3. Engine speed is too slow.
4. Shorted generator circuit.
1. Run/Stop switch set to "Stop".
2. Dirty air cleaner.
3. Out of gasoline.
4. Stale gasoline.
5. Spark plug wire not connected to spark
plug.
6. Bad spark plug.
7. Water in gasoline.
8. Overchoking.
9. Low oil level.
10. Excessively rich fuel mixture.
11. Intake valve stuck open or closed.
12. Engine has lost compression.
1. Out of gasoline.
2. Low oil level.
3. Fault in engine.
1. Load is too high.
2. Dirty air filter.
3. Engine needs to be serviced.
1. Choke is opened too soon.
2. Carburetor is running too rich or too
lean.
Solution
1. Reset circuit breaker.
2. Check and repair.
3. Connect another device that is in good
condition.
4. Contact Generac service facility.
1. Disconnect shorted electrical load.
2. See "Don't Overload the Generator"
on page 10.
3. Contact Generac service facility.
4. Contact Generac service facility.
1. Set switch to "Run".
2. Clean or replace air cleaner.
3. Fill fuel tank.
4. Drain gas tank and fill with fresh fuel.
5. Connect wire to spark plug.
6. Replace spark plug.
7. Drain gas tank; fill with fresh fuel.
8. Put choke lever to "No Choke"
position.
9. Fill crankcase to proper level.
10. Contact Generac service facility.
11. Contact Generac service facility.
12. Contact Generac service facility.
1. Fill fuel tank.
2. Fill crankcase to proper level.
3. Contact Generac service facility.
1. See "Don't Overload the Generator"
on page 10.
2. Replace air filter.
3. Contact Generac service facility.
1. Move choke to halfway position till
engine runs smoothly.
2. Contact Generac service facility.
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