Since this is a "Dual" mig, setting the correct polarity is the most common hurdle:

If the wire won't feed even with high tension, your torch liner might be kinked or clogged with dust. 5. Troubleshooting Common Issues

If the machine gets too hot, the thermal cut-out will trip. The light will turn on, and the welder will stop until it cools down. 3. Setup and Wire Loading