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4-2. Troubleshooting

Trouble

No weld output; unit completely inop-

erative.

No weld output; fan motor FM running

and pilot light on.

Low weld output with no control.

Limited output and low open-circuit

voltage.

Erratic or improper weld output.

Fan motor FM does not run.

OM-194 415 Page 8

Be sure Power switch is On (see Section 3-1).

Be sure line disconnect switch is On (see Section 2-6).

Check line fuse(s) and replace if necessary (see Sections 2-6).

Check for proper input power connections (see Sections 2-5 and/or 2-6).

Thermostat(s) open (overheating). Allow fan to run; thermostat(s) closes when unit has cooled.

Check position of Weld Current Control (see Sections 3-1 and 3-2).

Check incoming power for correct voltage. Replace line fuse if open (see Section 2-6).

Check for proper input and output connections (see Sections 2-4 and/or 2-6).

Tighten all welding cable connections (see Sections 2-4).

Check for proper size and type of cable (see Section 2-4).

Check for proper input and output connections (see Sections 2-4 and/or 2-6).

Replace electrode.

Check and clear blocked fan blade; be sure blade is secure on shaft.

Have Factory Authorized Service Agent check fan motor FM.

Remedy