Section 4.4 - Troubleshooting Flowcharts; Problem 20 - Engine Will Not Crank When Utility Power Source Fails; Problem 21 - Engine Will Not Crank When Auto-Off-Manual Switch Is Set To "Manual - Generac Power Systems CorePower Repair Manual

ENGINE/DC CONTROL
Problem 20 – Engine Will Not Crank When Utility Power Source Fails
VERIFY UTILITY
OFF
SOURCE IS "OFF"
ON
TURN "OFF" -
RETEST
Problem 21 – Engine Will Not Crank When AUTO-OFF-MANUAL Switch is Set to "MANUAL"
TEST 55 – CHECK
GOOD
7.5 AMP FUSE
RECHARGE /
BAD
REPLACE
REPLACE
NOTE: If a starting problem is encountered,
the engine itself should be thoroughly
checked to eliminate it as the cause of starting
difficulty. It is a good practice to check the
engine for freedom of rotation by removing the
spark plugs and turning the crankshaft over
slowly by hand, to be sure it rotates freely.

WA R N I N G : D O N OT R OTAT E
ENGINE WITH ELECTRIC STARTER
WITH SPARK PLUGS REMOVED.
ARCING AT THE PLUG ENDS MAY
IGNITE THE LP OR NG VAPOR
EXITING THE SPARK PLUG HOLE.
PART 4
TEST 52 – CHECK
POSITION OF
AUTO-OFF-MANUAL
SWITCH
SWITCH IS "OFF"
SET TO "AUTO" -
RETEST
TEST 56 – CHECK
BATTERY
BAD
GOOD
TEST 53 – TRY A
SWITCH IS
MANUAL START
IN "AUTO"
ENGINE DOES
NOT CRANK
GO TO PROBLEM 21
REPLACE CONTROLLER
ASSEMBLY
TEST 57 – CHECK
GOOD
WIRE 56 VOLTAGE
BAD
REPLACE
CONTROLLER
ASSEMBLY
TEST 59 – TEST
STARTER MOTOR
BAD
Section 4.4
Troubleshooting Flowcharts
ENGINE
CRANKS
GOOD
TEST 58 –
CHECK STARTER
CONTACTOR
GOOD
REPLACE BAD
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