Miller Thunderbolt 225 - Troubleshooting Common Issues; Weld Output and Fan Issues; Arc and Electrode Issues

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4-3. Troubleshooting
Trouble Remedy
No weld output; fan does not run. 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).
Fan does not run; weld output okay. Be sure nothing is blocking movement of fan. If fan does not run freely, replace fan motor.
Erratic weld current. Clean and tighten all weld cable connections.
Erratic arc with excessive spatter. 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).
Electrode freezing to work. 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).
SECTION 5 – ELECTRICAL DIAGRAM
SA-108 072
Figure 5-1. Circuit Diagram For Welding Power Source