Daikin Split AC Error Code
Chandan Kumar •
| Error Code | Meaning / Problem |
|---|---|
| A1 | Indoor PCB (control board) fault |
| A3 | Drain water level / drainage problem |
| A5 | High pressure or freeze protection activated |
| A6 | Indoor fan motor fault |
| C4 | Indoor heat exchanger temperature sensor fault |
| C9 | Indoor air temperature sensor fault |
| E1 | Outdoor PCB fault |
| E3 | High pressure protection |
| E4 | Low pressure protection |
| E5 | Compressor overload / inverter fault |
| E6 | Compressor start error |
| E7 | Outdoor fan motor fault |
| F3 | Discharge pipe temperature too high |
| F6 | High pressure switch activated |
| H3 | High pressure switch fault |
| H6 | Compressor position / lock error |
| J3 | Discharge pipe temperature sensor fault |
| J6 | Heat exchanger temperature sensor fault |
| L5 | Inverter current overload |
| P4 | Inverter heat sink temperature high |
| U0 | Insufficient refrigerant (gas leak / undercharge) |
| U2 | Power supply voltage issue |
| U4 | Communication error between indoor & outdoor unit |
| U7 | Outdoor–outdoor communication error (multi-split) |
