TP-6953 7/19 119Section 7 Troubleshooting
7.4 General Troubleshooting Chart
Trouble Symptoms
Probable Causes Recommended Actions
Section or
Publication
Reference*
Does not crank
Cranks but
does not start
Starts hard
No or low output
voltage
Stops suddenly
Lacks power
Overheats
Low oil pressure
High fuel
consumption
Excessive or
abnormal noise
Displays error
message/locks up
Exercise run time
and/or event
records inoperative
Controller
x x Controller circuit board(s) inoperative. Replace the controller. Gen. S/M
x x Controller circuit board(s) wiring fault. Check the wiring. W/D
x Controller fault.
Troubleshoot the controller.[
Gen. S/M
x
Controller master control button in the
OFF/RESET mode.
Press the controller master control RU N or AUTO
button.
Section 2
x
Engine start c ircuit open. Press the controller master control RUN button to test
the generator set. Troubleshoot the auto start circuit
and the time delays.
Section 2, W/D,
Gen. S/M
x x
Emergency stop switch activated, if
equipped.
Reset the emergency stop switch. Section 2
x Controller firmware error. Review the controller display troubleshooting chart.
Alternator
x
AC output circuit breaker open. Reset the breaker and check for AC voltage at the
generator set side of the circuit breaker.
—
x
Transfer switch test switch in the OFF
position.
Move the transfer switch tes t switch to the AUTO
position.
—
x
Wiring, terminals, or pin in the exciter
field open.
Check for continuity. Gen. S/M or W/D
x
Main field (rotor) inoperative (open or
grounded).
Test and/or replace the rotor.[
Gen. S/M
x Stator inoperative (open or grounded).
Test and/or replace the stator.[
Gen. S/M
x Vibration excessive.
Tighten loose components.[
—
* Sec./Section—numbered section of this manual; ATS—Automatic Transfer Switch; Eng.—Engine; Gen.—Generator Set; I/M—Installation Manual; O/M—Operation Manual; S/M—Service
Manual; S/S—Spec Sheet; W/D—Wiring Diagram
[ Have an authorized service distributor/dealer perform this service.
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