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1. Perform the Contactor Test.
NOTE:Test is code specific.
Codes above 10100 may
or may not have a
Contactor PC Board.
2. The Contactor PC board or the
Control Board may be faulty.
Replace.
FUNCTION PROBLEMS (Continued)
Observe Safety Guidelines
detailed in the beginning of this manual.
Troubleshooting Guide – See Wiring Diagrams for location of specified
components. See Wiring Diagrams for troubleshooting of specific circuits.
The gas solenoid valve will not
function.
1. Make sure the LN-25™ is
equipped with a gas solenoid
valve and properly connected.
2. Make sure the gas supply is
adequate and the gas hoses
are not loose or kinked.
NOTE:Control Boards L12253-[ ]
or higher do not use a Gas
Solenoid PC Board.
1a.Perform the Solenoid PC
Board and Gas Solenoid
Valve Test
NOTE:Test is code specific.
Codes above 10100 may
or may not have a
Solenoid PC Board.
2. If a K434-1 gas flow timer kit is
installed in the unit, disconnect
and plug in the timer jumper
plug. If the gas solenoid
functions, then replace the
K434-1 kit.
3. The contactor board or remote
control board (if used) may be
faulty.
4. The control board may be
faulty. Replace.
F-6
TROUBLESHOOTING AND REPAIR
F-6
LN-25™
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
The wire feed motor runs at a
constant speed with no control.
NOTE:Loss of tach feedback may
result in MAX speed or a
motor voltage of approx.
14VDC depending on the
Control Board being used.
1. Make sure the mode switch
(S3) is in the CV mode.
2. Make sure the wire speed
control and the wire speed
range switch (S2) are set
correctly.
1. Perform the Hall Effect
Module Test.
2. Perform the Wire Drive Motor
Test.
3. The control board may be
faulty. Replace.
The contactor does not function.
1. Make certain the LN-25™ is
equipped with a contactor and
properly connected.
2. Check the connections to the
contactor PC board.
NOTE:Control Boards L12253-[ ]
or higher do not use a
Contactor PC Board.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
CAUTION