Symptom: abnormal voltage indicator light

Cause reason: Because the boot action is too slow, causing the switch contacts are not synchronized.

Workaround: After the shutdown can be re-opened.

Cause reason: supply voltage phase or input voltage is too high or too low (greater than 440V, or less than 320V), beyond the normal scope of work welder.

Solution: Use a multimeter to measure the input voltage, three-phase 380V AC is normal.