11
TROUBLESHOOTING
FC-90
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Lincoln Authorized Service Facility for technical troubleshooting assistance before you proceed.
WWW.LINCOLNELECTRIC.COM/LOCATOR
PROBLEM
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED COURSE OF ACTION
Bead is too thick (inter-
mittently).
Travel speed is slow and/or inconsistent.
Increase and maintain a constant travel speed.
Output heat range is too high.
Turn the voltage down.
Bead does not penetrate base
metal.
Travel speed is inconsistent.
Decrease and maintain a constant travel speed.
Output heat range is too low.
Turn the voltage up.
Wire sputters and sticks to
workpiece.
The wire is damp.
Change to dry wire. Be sure wire is stored in a dry location
Wire feed speed (WFS) is too fast.
Reduce WFS.
Edge of weld has ragged
depressions.
Travel speed is too fast.
Reduce travel speed.
WFS is too fast.
Reduce WFS.
Output heat range is too high.
Set the Low – High Heat Range switch to Low or the Fine
Heat Adjustment to (1).
