What should I do if the Miller Matic 211 overheats or if the over-temperature light flashes?

If the unit overheats, the thermostat opens, output stops, and the cooling fan runs. Allow the fan to run with the gun trigger switch off; the thermostat will close when the unit has cooled. The 120V model has a 20% duty cycle (3 minutes welding, 7 minutes resting) and the 230V model has a 30% duty cycle (2 minutes welding, 8 minutes resting). Wait fifteen minutes for the unit to cool and reduce amperage or duty cycle before resuming welding.