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TROUBLESHOOTING & REPAIR
F-10 F-10
COMMANDER 300
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,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
ENGINE PROBLEMS
The engine shuts down shortly after
starting.
1. Check for adequate fuel supply.
2. If any indicator light is lit when
the engine shuts down, that par-
ticular system has faulted.
Check system.
3. Check the battery cables for
loose or faulty connections.
1. Check the Run/Stop switch and
associated leads for loose or
faulty connections.
2. Perform the Fuel Shutdown
Solenoid Test.
3. The engine protection board
may be faulty. With the Run/
Stop switch in the “Run” posi-
tion, the protection board should
normally supply 10VDC to the
shutdown solenoid via leads
#224 and #262. See the Wiring
Diagram.
The engine will not idle down to low
speed. The machine has normal
weld output and auxiliary power.
1. Make sure the idler switch is in
the “Auto” position.
2. Make sure there is NOT an
external load on the weld termi-
nals nor the auxiliary power
receptacles.
3. Check for mechanical restric-
tions in the solenoid linkage.
1. Perform the Idler Solenoid
Test.
2. The engine protection board
may be faulty.