Lincoln Electric LN-25 Service Manual page 43

F-6
Troubleshooting Guide –
components. See Wiring Diagrams for troubleshooting of specific circuits.
PROBLEMS
(SYMPTOMS)
The wire feed motor runs very fast
and there is no control.
The gas solenoid valve will not
function.
The contactor does not function.
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 216-383-2531 or 1-800-833-9353.
TROUBLESHOOTING AND REPAIR
See Wiring Diagrams for location of specified
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FEEDING PROBLEMS (Continued)
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. 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.
1. Make certain the LN-25 is
equipped with a contactor and
properly connected.
2. Check the connections to the
contactor PC board.
CAUTION
LN-25
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Perform the Wire Drive Motor
Test.
2. Perform the Hall
Module Test.
3. The control board may be
faulty. Replace.
1. Perform the Solenoid PC
Board and Gas Solenoid
Valve Test.
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.
1. Perform the Contactor Test.
2. The contactor PC board may
be faulty. Replace.
F-6
Effect