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V350-PRO
TROUBLESHOOTING & REPAIR
F-6 F-6
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, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353(WELD).
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The machine regularly overheats
and the yellow thermal light is ON
indicating a thermal overload.
1. The welding application may
be exceeding the
recommended duty cycle of the
V350-Pro.
2. Dirt and dust may have
clogged the cooling channels
inside the machine.
3. Air intake and exhaust louvers
may be blocked due to inade-
quate clearance around the
machine.
4. Make certain the fan as needed
(F.A.N.) is operating properly.
The fan should operate when
welding voltage is present
and/or when there is an over
temperature condition.
1. The 115VAC fan motor is
controlled by the control board
via the main switch board.
Perform the Fan Motor And
Control Test.
1. A thermostat or associated
circuitry may be faulty. See the
wiring diagram. One normally
closed thermostat is located on
the output choke and the other
is located on the main switch
board heat sink. See the wiring
diagram.
Note: The Main Switch Board
Removal Procedure will
be required to gain access
to the heat sink thermostat.
An attached wire feeder will not
function correctly.
1. Make certain the wire feeder
control cable is connected to
the correct 14-pin amphenol
type plug (115VAC or
24/42VAC) for the wire feeder
being used. See the
connection diagram.
2. Check the two circuit breakers
located at the rear of the
machine. Reset is tripped.
3. The wire feeder or control cable
may be faulty.
1. Perform the Auxiliary
Transformer Test.
2. Check the leads between the
14-pin amphenol type plugs
and the auxiliary transformer
for loose or faulty connections.