Troubleshooting - Miller Thunderbolt XL Owner's Manual

7-4. 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.
Noise and vibration from shunt block.
OM-316 Page 24
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A complete Parts List is available at www.MillerWelds.com
Be sure line disconnect switch is in On position (see Section 5-6).
Check and replace line fuses if open. Reset breakers if necessary (see Section 5-6).
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.
Shorten arc length.
Reduce amperage setting (see Section 6-1).
Increase amperage setting (see Section 6-1).
Increase arc length.
Use dry, properly stored electrodes.
Lubricate shunt block and/or tighten adjustment screws (see Section 7-2).
Remedy