Daikin Indoor Unit Error Codes
| A0 External protection device activated |
| A1 Malfunction of indoor unit PCB |
| A3 Malfunction of drain Level control system |
| A4 Malfunction of freezing protection |
| A5 High-pressure |
| A6 Fan motor locked, overload, overcurrent |
| A7 Malfunction of the swing flap motor |
| A8 Malfunction of power supply |
| A9 Malfunction of electronic expansion valve drive Defect of electronic expansion valvecoil |
Defect of indoor unit PCB
Defect of connector contact
AA Heater overheat 26WH is activated
AF Malfunction of a humidifier system Water leakage of the humidifier (option)
Failure of swing float switch
Improper drain piping incline
AH Malfunction of the dust collector of air cleaner Defect of dust collecting element
Defect of high voltage power supply unit
Error Malfunction of indoor unit PCB
| AJ Malfunction of capacity setting |
| C1 Failure of the transmission |
| C4 Malfunction of liquid pipe thermistor |
| C5 Malfunction of gas pipe thermistor for heat exchanger Defect of connector contact Connection failure of connector wiring Breakdown of the thermistor for heat exchanger Defect or failure of main PCB |
The Influence of Defect Gas Pipe in Thermistor Heat Exchanger
| C6 Malfunction of fan motor control driver |
| C7 Front panel driving motor fault |
| C9 Malfunction of suction air thermistor |
| CA Malfunction of discharge air thermistor Defect of connector contact Defect of the thermistor for discharge air CC Malfunction |
| CJ Malfunction of room temperature sensor in the remote controller. |
Daikin Outdoor Unit Error Codes
| E1-Lack of refrigerant |
| E2-High pressure protection |
| E3-Low pressure protection |
| E4-Outdoor thermistor |
| E5-Indoor thermistor |
| E6-Outdoor ambient temperature sensor error |
| E7-Outdoor ambient temperature sensor error |
| E8-Indoor ambient temperature sensor error |
| E9-Heat sink temperature sensor error |
| EA – EEPROM error |
| EC – Malfunction of drain Level control system |
| EF – Malfunction due to blockage of the fan motor |
| F3: Outdoor ambient temperature sensor failure. |
| F6: Indoor ambient temperature sensor failure. |
| H0 – Non-volatile memory error |
| H1 – Malfunction of the indoor unit PCB |
| H2 – Malfunction of the outdoor unit PCB |
| H3 – Malfunction of the indoor/outdoor unit PCB communication |
| H4 – Malfunction of the indoor unit fan motor |
| H5 – Malfunction of the outdoor unit fan motor |
| H6 – Malfunction of the outdoor ambient temperature sensor or malfunction of the outdoor unit compressor discharge temperature sensor |
| H7 – Malfunction of the indoor unit evaporator temperature sensor |
| H8 – Refrigerant leakage detection (indoor unit) |
| H9 – Refrigerant leakage detection (outdoor unit) |
| HC – High pressure switch circuit malfunction |
| HF – High-temperature protection of the compressor motor |
| HJ – High-pressure protection |
| J1: Malfunction of drain Level control system |
| J2: Malfunction of a drain pump |
| J3: Malfunction of the drain hose |
| J4: Malfunction of drain motor |
| J5: Malfunction of the drain pan switch |
| J6: Malfunction of LLS sensor or LLS sensor harness defective |
| J7: Malfunction of discharge temperature thermistor |
| J8: Malfunction of discharge temperature thermistor harness (open circuit) |
| J9: Malfunction of discharge temperature thermistor harness (short circuit) |
| JA: Indoor unit PCB error |
| JE: Indoor / outdoor unit communication error |
| JC: Outdoor unit PCB error |
| JF: Outdoor unit address setting error |
| JH: The size of the indoor unit does not match the outdoor unit |
| L0: No error |
| L1: Indoor pipe temperature sensor open or short-circuited. |
| L3: Outdoor pipe temperature sensor open or short-circuited. |
| L4: Sub-cool Heat Exchanger High-Pressure Protection (Discharge Pipe Sensor) |
| L5: Sub-cool Heat Exchanger Low-Pressure Protection (Suction Pipe Sensor) |
| L6: Communication error between the indoor and outdoor units. |
| L8: Malfunction of drain Level control system. |
| L9: Malfunction of the drain pump. |
| LA. Leakage of refrigerant (freezing of liquid pipe). |
| LC- Malfunction in DC fan motor. |
| P0 Error: Malfunction of indoor unit PCB |
| P1 Error: Malfunction of outdoor unit PCB |
| P2 Error: Malfunction of room temperature thermistor |
| P3 Error: Malfunction of drain level control system |
| P4 Error: Malfunction of pipe temperature thermistor |
| P8 Error: Malfunction of sub-cool heat exchanger thermistor (Outdoor unit) |
| P9 Error: Malfunction of liquid pipe thermistor (Outdoor unit) |
| U0 Indoor/outdoor unit communication fault |
| U1 Zero-cross signal detection fault |
| U2 Malfunction of drain level control system |
| U3 Malfunction of drain pump |
| U4 Heat exchanger temperature sensor fault |
| U5 Malfunction of outdoor temperature sensor |
| U6 Malfunction of evaporator temperature sensor |
| U7 Malfunction of optical fiber transmission system between outdoor and indoor units |
| U8 Malfunction of inverter PCB (speed control system) |
| U9 Indoor/outdoor unit parameter setting fault |