Daikin Error Codes
Every Daikin error code we have catalogued, with what it means on site — 71 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.
71 codes
| Code | What it means |
|---|---|
| A0 | External protection device activated |
| A1 | Indoor unit PCB malfunction |
| A3 | Drain level control system malfunction |
| A4 | Freezing protection malfunction |
| A5 | High pressure control (heating) / freeze-up protection (cooling) |
| A6 | Fan motor locked, overload, overcurrent |
| A7 | Swing flap motor malfunction |
| A8 | Power supply malfunction |
| A9 | Electronic expansion valve drive malfunction |
| AA | Heater overheat |
| AH | Dust collector (air cleaner) malfunction |
| AJ | Capacity setting malfunction (indoor PCB) |
| C1 | Transmission failure (indoor PCB ↔ fan PCB) |
| C4 | Liquid pipe thermistor malfunction (heat exchanger) |
| C5 | Gas pipe thermistor malfunction (heat exchanger) |
| C6 | Fan motor control driver malfunction |
| C9 | Suction air thermistor malfunction |
| CA | Discharge air thermistor malfunction |
| CC | Humidity sensor malfunction |
| CJ | Remote controller thermistor malfunction |
| E0 | Protection devices actuated (unified) |
| E1 | Outdoor unit PCB defect |
| E3 | High pressure switch (HPS) actuated |
| E4 | Low pressure switch (LPS) actuated |
| E5 | Inverter compressor motor overheat |
| E6 | STD compressor overcurrent / lock |
| E7 | Outdoor fan motor malfunction |
| E8 | Inverter compressor overcurrent |
| E9 | Electronic expansion valve coil malfunction |
| EA | Four-way valve malfunction |
| F3 | Discharge pipe temperature malfunction |
| F6 | Abnormal high pressure in cooling |
| H0 | Compressor sensor system malfunction |
| H3 | High pressure switch (HPS) malfunction |
| H4 | Low pressure switch (LPS) malfunction |
| H6 | Position detection sensor malfunction |
| H7 | Outdoor fan motor signal malfunction |
| H8 | Compressor input (CT) system malfunction |
| H9 | Outdoor air thermistor malfunction |
| J1 | Pressure sensor malfunction |
| J2 | Compressor current sensor malfunction |
| J3 | Discharge pipe thermistor malfunction |
| J5 | Suction pipe thermistor malfunction |
| J6 | Heat exchanger thermistor malfunction |
| J7 | Liquid pipe thermistor malfunction |
| J9 | Gas pipe thermistor malfunction |
| JA | High pressure sensor malfunction |
| JC | Low pressure sensor malfunction |
| L0 | Inverter system malfunction |
| L1 | Inverter PCB malfunction |
| L4 | Inverter radiating fin temperature rise |
| L5 | Inverter instantaneous overcurrent (DC) |
| L8 | Inverter compressor overcurrent |
| L9 | Inverter compressor startup malfunction |
| LA | Power transistor malfunction |
| LC | Transmission malfunction (outdoor PCB ↔ microcomputer) |
| P1 | Power voltage imbalance / open phase |
| P3 | Thermistor malfunction in electrical box |
| P4 | Radiating fin temperature sensor malfunction |
| PJ | Capacity setting malfunction (outdoor PCB) |
| U0 | Shortage of refrigerant |
| U1 | Reverse phase / open phase |
| U2 | Power supply voltage defect / instantaneous power failure |
| U3 | Check operation not executed |
| U4 | Transmission malfunction (indoor ↔ outdoor) |
| U5 | Transmission malfunction (indoor ↔ remote) |
| U7 | Transmission malfunction (main ↔ INV microcomputer) |
| U8 | Transmission malfunction (between remotes) |
| UA | Indoor/outdoor combination or power defect |
| UF | Wiring and piping mismatch |
| UH | System malfunction |
Official Daikin source / manual ↗
Look up any error code — offline — in R-Pro.
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