Derby Error Codes
Every Derby error code we have catalogued, with what it means on site — 31 codes in total. In R-Pro, tap any code to get the meaning, likely causes and inspection steps, even with no signal in the plant room.
31 codes
| Code | What it means |
|---|---|
| E0 | EEPROM malfunction / memory corruption |
| E1 | Indoor/outdoor communication failure |
| E2 | Power supply voltage fluctuation/failure |
| E3 | Indoor/outdoor fan speed control issue |
| E4 | System abnormality / compressor protection |
| E5 | Outdoor temp sensor malfunction |
| E6 | Indoor fan motor / temp sensor fault |
| E7 | Outdoor ambient temp sensor fault |
| E8 | Discharge temp sensor fault |
| E9 | Inverter module / IPM protection warning |
| EC | Refrigerant leakage detection |
| EE | EEPROM error / memory loss |
| F1 | Outdoor DC fan motor fault |
| F2 | Compressor starting failure |
| F3 | Compressor loss of synchronism |
| F4 | Exhaust temp overheat protection |
| F5 | Compressor top cover protection |
| F6 | Outdoor EEPROM fault |
| F7 | Voltage protection (over/under) |
| F8 | Outdoor main board failure |
| F9 | PFC protection / inverter fault |
| P0 | IPM module overcurrent |
| P1 | Over/under voltage lockout |
| P2 | Compressor top temp protection |
| P3 | Outdoor low temp protection |
| P4 | Compressor drive error (inverter) |
| P5 | Mode conflict (multi-split) |
| P6 | Compressor low-pressure protection |
| P7 | Outdoor IGBT temp sensor error |
| H1 | Auto-defrost mode (normal) |
| H3 | Compressor overload protection |
Official Derby source / manual ↗
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