What should I do if the Miller Matic 211 has no weld output but the wire feeds and fan runs?

If there is no weld output while the wire feeds and fan continues running, the thermostat TP1 is likely open due to overheating. Allow the fan to run with the gun trigger switch off until the thermostat closes and the unit cools down. Additionally, check that the gun trigger plug is securely connected, release the trigger and cycle power off and back on, and verify proper polarity connections.