What should I do if my Migatronic RALLY MIG 161i Welding System displays error E21-04?
- JJessica HunterAug 27, 2025
If your Migatronic Welding System shows error E21-04, it means the welding program package on the SD card is not compatible with your control unit. You should use an SD card that contains software that is the correct match for your control unit.













