
Episode #3
CNC VFD Error Codes Explained: Common Causes and First Checks
<p>Your CNC spindle suddenly stops, and the VFD displays an angry little error code. What does it mean—and what should you check before assuming something has failed?</p><p>In Episode 3 of The CNC Workshop, Daniel and Jamie explain how to approach common CNC VFD faults without simply clearing the code and hoping it disappears. They discuss:</p><p>• Why a VFD error code is a clue—not a complete diagnosis<br>• ERR09 undervoltage faults and possible power-supply problems<br>• ERR12 input phase-loss faults and wiring checks<br>• ERR31 or 031 communication and control-signal issues<br>• ERR38 current-detection and hardware-relat...




