Troubleshooting; Circuit Diagram For Welding Power Source; Section 5 - Electrical Diagram - Miller Thunderbolt 225 Owner's Manual

4-3. Troubleshooting

Trouble
No weld output; fan does not run.
Fan does not run; weld output okay.
Erratic weld current.
Erratic arc with excessive spatter.
Electrode freezing to work.
SECTION 5 – ELECTRICAL DIAGRAM
Be sure line disconnect switch is in On position (see Section 2-3).
Check and replace line fuses if open. Reset breakers if necessary (see Section 2-3).
Be sure nothing is blocking movement of fan. If fan does not run freely, replace fan motor.
Clean and tighten all weld cable connections.
Use dry, properly stored electrodes. See User's Guide also.
Shorten arc length. See User's Guide also.
Reduce amperage setting (see Section 3-1).
Use dry, properly stored electrodes. See User's Guide also.
Increase arc length. See User's Guide also.
Increase amperage setting (see Section 3-1).
Figure 5-1. Circuit Diagram For Welding Power Source
Remedy
SA-108 072
OM-116 Page 7