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TROUBLESHOOTING & REPAIR
F-10 F-10
COMMANDER 400
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-
800-833-9353 (WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
ENGINE PROBLEMS
The engine cranks but will not start. 1. Check for adequate fuel supply.
2. Make sure the fuel shut off valve
is in the open position (lever is in
line with the hose).
3. The battery voltage may be too
low. If it is less than 11VDC,
charge or replace the battery.
Check the charging system.
4. If the engine temperature light is
lit, check the engine cooling sys-
tem.
1. Check leads #274 & #240A at
J50 (exciter voltage plug) for
loose or faulty connections.
See the Wiring Diagram.
2. Perform the Shutdown
Solenoid Test.
3. Check leads #224, #225, #240
and #262 for loose or faulty con-
nections. See the Wiring
Diagram.
4. Make sure the control board
mounting/grounding screws are
tight.
5. Check solenoid waveforms as
illustrated in the Oscilloscope
Waveforms Section.
6. Check to make sure that J4 &
J23 are not swapped at the con-
trol board. See the Wiring
Diagram.
The engine shuts down shortly after
start. Initialize sequence is normal
(see Initialization Sequence sec-
tion).
1. Check for adequate fuel supply.
2. If any indicator light is lit when
the engine shuts down, that
particular system has faulted.
Check system.
3. Check for loose, faulty, or cor-
roded battery cable connec-
tions.
4. Check the Run/Stop switch and
associated leads for loose or
faulty connections.
1. Perform the Shutdown
Solenoid Test.
2. If possible check solenoid wave-
forms as illustrated in the
Oscilloscope Waveforms sec-
tion.
3. The control board may be faulty.