- Efficiency below design
- Efficiency exceeds 100%
- Sub-optimal load
- Voltage unbalance detected
- Current unbalance detected
- Load approaching service factor
- Load exceeding service factor
- Low power factor
- Overvoltage operation
- Undervoltage operation
- High total harmonic distortion (THD)
- High total demand distortion (TDD)
- High ambient temperature
- Ambient temperature exceeds limit
- High operating temperature
- Operating temperature exceeds limit
- High-magnitude partial discharge detected
- Polarization Index indicates bad windings
- Surface contamination present
- Internal discharges detected

