What should I do if the machine overheats during welding?
If the machine overheats, the thermostat(s) will open, cutting the output, and the cooling fan will activate. Wait 15 minutes for the unit to cool down before resuming welding. Reduce the current or duty cycle before continuing to weld. (Page 13)
From the official Miller PipeWorx 400 Welding Machine manual, page 13
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