What should I do if the Spectrum 375 overheats during operation?

If the unit overheats, the thermostat opens, output stops, the Temperature trouble light turns on, and the cooling fan runs. You must wait fifteen minutes for the unit to cool or until the temperature light goes off before continuing. To prevent overheating, reduce amperage or duty cycle before starting to cut again. Exceeding the duty cycle can damage the unit and void the warranty. (Page 13)