Daikin error code

Codes Description
System 00 Normal
U0 Refrigerant shortage
U2 Drop voltage or main circuit overvoltage
U4 Failure of transmission (between the indoor unit and outdoor unit)
Indoor unit A1 Indoor PCB defectiveness
A5 High-pressure control or freeze-up protector
A6 Fan motor fault
C4 Faulty heat exchanger temperature sensor
C9 The faulty suction air temperature sensor
Outdoor unit EA Cooling-heating switching error
E5 Ol started
E6 Faulty compressor startup
E7 Dc fan motor fault
E8 Overcurrent input
F3 High-temperature discharge pipe control
H6 Operation halt due to the faulty position detection sensor
H8 Dc current sensor fault
H9 The faulty suction air temperature sensor
J3 Faulty discharge pipe temperature sensor
J6 Faulty heat exchanger temperature sensor
L4 The high temperature at inverter circuit heatsink
L5 Output overcurrent
P4 Faulty inverter circuit heatsink temperature sensor
Error codes Cause
A3 Drain level control system abnormality
A5 Freeze-up protection control or heating peak-cut control
A6 Fan motor or related abnormality
A7 Swing motor look
A9 Electronic expansion valve abnormality
AF Drain system abnormality
C4 Thermistor or related abnormality
C5 Thermistor or related abnormality
C7 Front panel open / close fault
C9 Thermistor or related abnormality
CJ Remote controller thermistor abnormality
E2 BP unit PCB abnormality
E3 Actuation of high pressure switch
E4 Actuation of low pressure switch
E5 Compressor motor lock
E7 Outdoor fan motor abnormality
E9 Moving part of electronic expansion valve (Y1E, Y3E) abnormality
F3 Discharge pipe temperature abnormality
F6 Refrigerant overcharged
H9 Outdoor temperature thermistor (R1T) abnormality
JO BP liquid or gas pipe thermistor abnormality
J3 Discharge pipe thermistor (R2T) abnormality
J5 Suction pipe thermistor (R3T, R5T) abnormality
J6 Outdoor heat exchanger thermistor (R4T) abnormality
J7 Outdoor liquid pipe thermistor (R7T) abnormality
J9 Subcooling heat exchanger gas pipe thermistor (R6T) abnormality
JA High pressure sensor abnormality
JC Low pressure sensor abnormality
L1 Outdoor unit PCB abnormality
L4 Radiation fin temperature rise
L5 Inverter compressor abnormality
L8 Inverter current abnormality
L9 Inverter start-up error
P1 High voltage of capacitor in main inverter circuit
P4 Radiation fin thermistor abnormality
U2 Power supply insufficient or instantaneous failure
U3 Check operation is not conducted.
U4 Transmission error between indoor unit and BP unit
U5 Transmission error between remote controller and indoor unit
U8 Transmission error between main and sub remote controllers
U9 Transmission error between indoor unit and outdoor unit in the same system
UA Field setting switch abnormality
UC Address duplication of central remote controller
UE Transmission error between centralized remote controller and indoor unit
UF System is not set yet
UH System abnormality refrigerant system address undefined
UJ Transmission error between outdoor unit and BP unit
Error codes Cause
UO Insufficient gas
US Power factor module abnormality
W Signal transmission error (between indoor and outdoor units)
US Signal transmission error (between indoor unit and remote controller)
R1 Indoor Unit
R3 Faulty drainage
R 5 Operation halt due to the freeze protection function or high pressure control
R6 Fan motor or related abnormality
CH or CS Heat exchanger temperature thermistor abnormality
C3 Room temperature thermistor abnormality
CR Discharge air temperature thermistor abnormality
ES Outdoor Unit
E6 Compressor startup error
F3 Operation halt due to discharge pipe control function
H8 CT or related abnormality
H3 Outside air thermistor or related abnormality
J3 Discharge pipe temperature thermistor or related abnormality
J6 Heat exchanger temperature thermistor or related abnormality
J3 Gas pipe temperature thermistor or related abnormality
LH Radiation fin temperature rise
P3 Heat radiation fin thermistor or related abnormality
PH Heat radiation fin thermistor or related abnormality
EO Protectors Function
Problem Cause
Operation does not start soon.

  • When the “ON/OFF” button was pressed soon after the operation was stopped.
  • When the mode was reselected.
This is to protect the air conditioner. You should wait for about 3 minutes.
Hot air does not flow out soon after the start of HEAT operation. The air conditioner is warming up. You should wait for 1 to 4 minutes. (The system is designed to start discharging air only after it has reached a certain temperature.)
The HEAT operation stops suddenly and a flowing sound is heard. The system is taking away the frost on the outdoor unit. You should wait for about 4 to 12 minutes.
The outdoor unit emits water or steam. In HEAT operation

  • The frost on the outdoor unit melts into water or steam when the air conditioner is in defrost operation. In COOL or DRY operation
  • Moisture in the air condenses into water on the cool surface of outdoor unit piping and drips.
The mist comes out of the indoor unit. This happens when the air in the room is cooled into mist by the cold airflow during COOL operation. This is because the air in the room is cooled by the heat exchanger and becomes mist during defrost operation.
The indoor unit gives out the odor. This happens when smells of the room, furniture, or cigarettes are absorbed into the unit and discharged with the airflow. If this happens, it is recommended to have the indoor unit washed by a technician. Consult the service shop where you purchased the air conditioner.
The outdoor fan rotates while the air conditioner is not in operation. After the operation is stopped

  • The outdoor fan continues rotating for another 60 seconds for system protection. While the air conditioner is not in operation
  • When the outdoor temperature is very high, the outdoor fan starts rotating for system protection.
Operation stopped suddenly. (OPERATION lamp is on.) For system protection, the air conditioner may stop operating on a sudden large voltage fluctuation. It automatically resumes operation in about 3 minutes.
No remote controller signals are displayed. Remote controller sensitivity is low. The display is low in contrast or blacked out. The display runs out of control. The batteries are dying and the remote controller is malfunctioning. Replace all the batteries with new size batteries, AAA.LR03 (alkaline). For details, refer to set the batteries of this manual.
Possible sounds Flowing water:

  • Generated because the refrigerant in the air conditioner is flowing.
  • This is a pumping sound of the water in the air conditioner and heard when the water is pumped out from the air conditioner in cooling or drying operation.
  • The refrigerant flows in the air conditioner even if the air conditioner is not working when the indoor units in other rooms are in operation. Blowing
  • Generated when the flow of the refrigerant in the air conditioner is switched over. Pinging
  • Generated when the size of the air conditioner slightly expands or shrinks as a result of temperature changes.
Problem Cause
The air conditioner does not operate. (OPERATION lamp is off.)
  • Is a breaker off or a fuse blown?
  • Is there a power failure?
  • Are batteries set in the remote controller?
  • Is the timer setting correct?
Cooling (Heating) effect is poor.
  • Are the air filters clean?
  • Is there anything to block the air inlet or the outlet of the indoor and the outdoor units?
  • Is the temperature setting appropriate?
  • Are the windows and doors closed?
  • Are the airflow rate and the airflow direction set appropriately?
Operation stopped suddenly. (OPERATION lamp flashes.)
  • Are the air fi lters clean?
  • Is there anything to block the air inlet or the outlet of the indoor and the outdoor units?
  • Clean the air fi lters or take all obstacles away and turn the breaker off. Then turn it on again and try operating the air conditioner with the remote controller. If the lamp still flashes, call the service shop where you purchased the air conditioner.
  • Are operation modes all the same for indoor units connected to outdoor units in the multi system? If not, set all indoor units to the same operating mode and confi rm that the lamps flash. Moreover, when the operating mode is in AUTO, set all indoor unit operating modes to COOL or HEAT for a moment and check again that the lamps are normal. If the lamps stop flashing after the above steps, there is no malfunction.
An abnormal functioning happens during operation. The air conditioner may malfunction with lightning or radio waves. Turn the breaker off, turn it on again and try operating the air conditioner with the remote controller.
The louvers do not immediately swing. The louvers move soon after startup. The air conditioner is adjusting the louvers position. The louvers will start moving soon.