What to do if Kemppi X3 stops and shows Err 4 with overheating indicator?
- JJennifer MosleyJul 27, 2025
If your Kemppi Welding System stops, the overheating indicator is lit, and Err 4 is displayed, it means the machine has overheated. Ensure unrestricted cooling air flow. The machine’s duty cycle may have been exceeded. If no other damage occurs, the fan will start, and the machine will recover in a few minutes. If the problem continues, contact a Kemppi service representative.