Troubleshooting - Lincoln Electric PRECISION TIG 225 Operator's Manual

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Machine is Dead -No Output - No
Fan
Fan runs normally at power up - No
output from machine in either Stick
or TIG modes.
Fan runs at power up - No output
from machine in either Stick or TIG
modes and the yellow light on the
control panel is on.
Machine does not respond (no gas
flow, no high frequency and no open
circuit voltage) when arc start switch
or Amptrol is activated - fan is work-
ing.
Machine regularly over heats - the-
mostat opens, Yellow light on front
panel glows. The fan runs but
machine has no output.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

TROUBLESHOOTING

POSSIBLE
CAUSE
OUTPUT PROBLEMS
1. Make certain that the input power
switch is in the "ON" position and
machine is plugged in.
2. Check the input voltage at the
machine. Input voltage must
match the rating plate and volt-
age connection.
Reconnect Procedure in the
Installation section of this manual.
3. Blown or missing fuses in input
line.
1. Check for proper input voltages
per nameplate and voltage recon-
nection.
2. Check to make sure polarity
switch is not in between two posi-
tions.
1. Welding application may have
exceed the recommended duty
cycle. Allow the unit to run until
the fan cools the unit and the yel-
low light goes out.
2. The air vents may be blocked.
Remove air obstruction and
allow unit to cool
1. Machine MUST be in the TIG
Mode.
2. The Amptrol may be defective.
Check for continuity between
pins "D" and "E" on cable con-
nector when Amptrol
depressed.
1. Welding application may exceed
recommended duty cycle. Reduce
the duty cycle.
2. Dirt and dust may have clogged
the cooling channels inside the
machine. Blow out unit with clean,
dry low pressure air.
3. Air vents and exhaust louvers may
be blocked due to inadequate
clearance around machine.
CAUTION
RECOMMENDED
COURSE OF ACTION
Refer to
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.
is
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