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TROUBLESHOOTING & REPAIR
F-11 F-11
COMMANDER 300
TROUBLESHOOTING GUIDE Observe Safety Guidelines
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 will not go to high idle
when using the auxiliary power.
Auxiliary power is normal when the
idler switch is in the “high” position.
Automatic idle function works prop-
erly when the welding terminals are
loaded.
1. Make sure the auxiliary power
leads are tight.
2. The automatic idler may not
function if the auxiliary power is
loaded to less than 150 watts.
1. Check the current sensing
toroid for loose or faulty connec-
tions. See the Wiring Diagram.
2. Make sure leads #3 and #6A
pass through the toroid twice in
opposite directions.
3. The current sensing toroid may
be faulty.
4. The engine protection board
may be faulty.
The engine will not go to high idle
when attempting to weld or when
the auxiliary power is loaded.
Welding output and auxiliary power
outputs are normal when idler
switch is in the “High” position.
1. Make sure the welding cables
and auxiliary power lead con-
nections are tight.
1. The engine protection board
may be faulty.
The machine goes to low idle but
does not stay at low idle.
1. Make sure there is NOT an
external load (auxiliary or weld)
connected to the Commander
300.
1. The idler solenoid linkage may
be misadjusted or damaged.
2. The idler solenoid lead connec-
tions (#226A and #237A) may
be loose or damaged.
3. Perform the Idler Solenoid
Test.
4. The engine protection board
may be faulty.