If the inflator overheats, the display will show "HI" flashing for 5 seconds every minute to alert you. At this point, pressing the start button will not activate the motor. Do not unplug the air hose. Instead, simply leave the inflator undisturbed and allow it to cool down for a period of time. Once the internal motor temperature drops back to a safe level, the inflator will automatically reset and regain its ability to start inflation again.