Section 4.4 - Troubleshooting Flowcharts; Problem 14 - Engine Will Not Crank; When Utility Voltage Fails; Problem 15 - Engine Will Not Crank When - Generac Power Systems 7 kW NG Repair Manual

Section 4.4
Troubleshooting Flowcharts
Problem 14 – Engine Will Not Crank When Utility Power Source Fails
VERIFY UTILITY
OFF
SOURCE IS "OFF"
ON
TURN "OFF" -
RETEST
REPLACE CONTROLLER
ASSEMBLY
Problem 15 – Engine Will Not Crank When AUTO-OFF-MANUAL Switch is Set to "MANUAL"
TEST 44 – CHECK
GOOD
7.5 AMP FUSE
RECHARGE /
BAD
REPLACE
REPLACE
CONTROLLER
ASSEMBLY
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.
Page 110
TEST 40 – CHECK
POSITION OF
AUTO-OFF-MANUAL
SWITCH
SWITCH IS "OFF"
SET TO "AUTO" -
RETEST
TEST 43 – CHECK
AUTO OPERATION
BAD
OF CONTROLLER
REPLACE CONTROLLER
ASSEMBLY
TEST 45 – CHECK
BATTERY
BAD
REPLACE
BAD
TEST 42 – TEST
AUTO-OFF-MANUAL
SWITCH
GOOD
PART 4
TEST 41 – TRY A
SWITCH IS
MANUAL START
IN "AUTO"
ENGINE DOES
NOT CRANK
GO TO PROBLEM 15
TEST 42 – TEST
AUTO-OFF-MANUAL
SWITCH
BAD
TEST 46 – CHECK
GOOD
WIRE 56 VOLTAGE
GOOD
BAD
V-TWIN
UNITS
TEST 47 – CHECK
STARTER
CONTACTOR RELAY
(SCR)
BAD
REPLACE
TEST 49 – TEST
STARTER MOTOR
REPLACE
BAD
ENGINE/DC CONTROL
ENGINE
CRANKS
GOOD
SINGLE
CYLINDER
UNITS
GOOD
TEST 48 –
CHECK STARTER
CONTACTOR
GOOD
BAD