What to do if Dart Controller displays “LF-L”?
- GGabriela LeachAug 2, 2025
If the Dart Controller displays “LF-L” when power is applied, it's likely due to excessive noise or an abnormally low frequency in the AC line. To resolve this, review the routing of power wires to minimize electrical noise. Check for other devices sharing the same circuit that might be producing unacceptable line noise. In some cases, especially with equipment like welders, applying an AC line filter, re-routing wires, dividing circuits, using shielded cable, and properly grounding devices usually solves the problem. The unit is designed to operate with AC lines from 48-62 Hertz.