26 Generac
®
Power Systems, Inc.
Appendix 1 – Troubleshooting
CENTURION 3500 Home Standby Generator
TROUBLESHOOTING GUIDE
SYMPTOM CAUSE CORRECTION
The engine will not crank. 1. Fuse blown 1. Replace fuse.
2. Loose, corroded or defective 2. Tighten, clean or replace
battery cables as necessary.
3. Defective starter contactor 3. Replace contactor.
4. Defective starter motor 4. Replace starter motor.
5. Low or defective battery 5. Charge or replace battery.
OVERCRANK – 2 flashes of LED 1. No fuel to the engine. 1. Make sure that the tanks are full and
the valves are opened.
2. Crimped fuel hose or hoses. 2. Check all fuel hoses to ensure that
there is no crimping and fuel is being
allowed to flow freely.
3. Defective fuel solenoid. 3. *
4. Open #14 wire from engine 4. *
control board.
5. Defective spark plug/plug wire 5. Clean, re-gap, or replace plug/
not connected. connect plug wire.
OVERSPEED - 3 flashes of LED 1. Governor spring is disconnected. 1. Reconnect spring. Spring should be in
the second hole from the bottom
(shaft end) of the governor arm.
2. Governor spring is broken. 2. Replace spring. *
3. Governor arm or linkages are 3. *
loose or broken.
LOW OIL PRESSURE - 1. Engine oil is low. 1. Check and fill engine oil. Check
4 flashes of LED generator compartment for leaks.
2. Oil Pressure switch is defective. 2. *
3. Oil is contaminated with dirt. 3. Change oil and oil filter.
HIGH TEMPERATURE - 1. Engine oil is low. 1. Check and fill engine oil.
5 Flashes of LED 2. Air flow is restricted. 2. Check airflow openings for blockage.
3. Spark arrestor is plugged. 3. Clean or replace the spark arrestor.
4. Oil is contaminated with dirt. 4. Change oil and oil filter.
UNDERSPEED - 6 flashes of LED 1. Fuel supply is low. 1. Check and replenish fuel supply.
2. Speed adjust linkage is damaged 2. *
or control nut is loose.
The engine starts hard 1. Air cleaner plugged or damaged 1. Check, clean or replace air cleaner.
and runs rough.
2. Defective spark plug 2. Clean, re-gap or replace plug.
The engine starts, but shuts 1. Engine oil level low 1. Check oil and add oil as needed.
down immediately. 2. Defective low oil pressure switch 2. *
3. Defective high temperature switch 3. *
4. Defective engine control board 4. *
5. Overheated engine 5. Check that the airflow openings are
adequate.
The AUTO/OFF/MANUAL switch 1. Defective switch 1. *
is set to OFF, but the engine 2. AUTO/OFF/MANUAL switch 2. *
continues to run. is wired incorrectly
3. Defective engine control board 3. *
There is no AC output from 1. Main line circuit breaker(s) 1. Reset circuit breaker(s)
the generator. open to ON (or closed).
2. Generator internal failure 2. *
There is no transfer to utility. Defective transfer relay *
* Contact the nearest Generac Authorized Service Dealer for assistance.
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