• Err02: Over-current during speed up — Check for output circuit ground/short or motor short.
• Err03: Over-current during speed down — Check for output circuit issues.
• Err04: Over-current at constant speed — May indicate power cable is too long.
• Err05/06/07: Over-voltage — Input voltage too high or speed change too rapid.
• Err09: Under-voltage — Input voltage not in specification range.
• Err10: Inverter overload — Motor overloaded, clogged, or fan not working.
• Err11: Motor overload — Check motor parameters; motor may be clogged.
• Err15: External failure — Dust bin full, loose optoelectronic switch, or sensor broken.