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Wire jammed 2. Out of wire 3. Not enough tension 4. Wire liner worn 5. Wire disconnected internally 6. Contact tip clogged 1. Reload wire 2. Replace wire spool 3. Tighten tensioning screws if wire is slipping 4. Replace liner 5. Call 1-800-746-5641 for assistance 6. Replace contact tip (Aluminum) Wire burns back into tip or (Aluminum) Metal bubbles or burns through 1. Wire speed too slow 2. Travel speed too slow or heat is too high 1. Run speed in 7 - 10 range 2. Increase the travel speed or red