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LN-15
TROUBLESHOOTING & REPAIR
F-8 F-8
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
No shielding gas. 1. Make sure the gas supply is ade-
quate and the gas hoses are not
loose or kinked.
1. If the gas solenoid is not operat-
ing perform the Gas Solenoid
Test.
2. The Control Board may be faulty.
The shielding gas turns on sporad-
ically, or remains on all the time.
1. The pressure in the gas line may
have exceeded 80psi (5.5 bar)
1. Perform the Gas Solenoid Test.
2. The Control Board may be faulty.
The welding arc burns back to the
tip.
1. Check the wire feeding path for
mechanical restrictions,
2. Make sure the polarity is correct
for the process.
3. The contact tip may be worn.
4. The welding voltage may be set
too high or the wire feed speed
set too low.
5. Check the wire drive tension.
1. Perform the Wire Drive Motor
Test.
2. Perform the Hall Effect Module
Test.
The Display board shows “POS”
“PRE” or “BRN”.
1. The LN-15 is in the “Press and
Spin” set-up mode.
2. One of the dip switches on the
control board is set to “ON” for
the timer setting mode.
1. The Control board may be faulty.
2. The Display Board may be faulty.
There is porosity in the weld.
1. The part being welded may be
wet or very dirty.
2. The electrode being used may
be wet or rusty.
3. The shielding gas may be wrong
for the process.
4. There may not be enough shield-
ing gas.
5. Make sure the wire feed speed
and arc voltage are correct for
the process.
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
1-888-935-3877.
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.