| Subset | ID | Variable | States | States description |
| Failure cause | 1 | Power part | 0, 1, 2 | Normal, failure 1, failure 2 | 2 | Voltage adjustor | 0, 1 | Normal, failure | 3 | Transformation filter | 0, 1 | Normal, failure | 4 | Output filter | 0, 1 | Normal, failure | 5 | Fan | 0, 1 | Normal, failure |
| Failure mode | 6 | No output | 0, 1 | Normal, no output |
| Failure detection | 7 | Voltage output | 0, 1 | Output normal, output abnormal | 8 | Filter output | 0, 1 | Output, no output | 9 | Fan sound | 0, 1 | Normal, no sound |
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