Daikin Error Codes and Troubleshooting

Daikin Error Codes and Troubleshooting


Error CodesProblem
00Normal
UAIndoor-outdoor Unit Combination Fault
U0Refrigerant Shortage
U2Drop Voltage Or Main Circuit Overvoltage
U4Failure Of Transmission (Between Indoor Unit And Outdoor Unit)
A1Indoor Pcb Defectiveness
A5High Pressure Control Or Freeze-up Protector
A6Fan Motor Fault
C4Faulty Heat Exchanger Temperature Sensor
C9Faulty Suction Air Temperature Sensor
EACooling-heating Switching Error
E1Circuit Board Fault
E5OL Started
E6Faulty Compressor Start Up
E7DC Fan Motor Fault
F3High Temperature Discharge Pipe Control
F6High Pressure Control (In Cooling)
H0Sensor Fault
H6Operation Halt Due To Faulty Position Detection Sensor
H8DC Current Sensor Fault
H9Faulty Suction Air Temperature Sensor
J3Faulty Discharge Pipe Temperature Sensor
J6Faulty Heat Exchanger Temperature Sensor
L3Electrical Parts Heat Fault
L4High Temperature At Inverter Circuit Heatsink
L5Output Overcurrent
P4Faulty Inverter Circuit Heatsink Temperature Sensor

Led On Outdoor Unit PCB


2- Daikin L Series AC Error Codes:
Daikin L-Series Error Codes
Daikin L-Series Error Codes
Error CodesMeaning
System Error Codes
00Normal
U0Refrigerant shortage
U2Low-voltage detection or over-voltage detection
U4Signal transmission error (between indoor unit and outdoor unit)
UAUnspecified voltage (between indoor unit and outdoor unit)
Indoor Unit Error Codes
A1Indoor unit PCB abnormality
A5Freeze-up protection control or heating peak-cut control
A6Fan motor or related abnormality
C4Indoor heat exchanger thermistor or related abnormality
C9Room temperature thermistor or related abnormality
Outdoor Unit Error Codes
E1Outdoor unit PCB abnormality
E5OL activation (compressor overload)
E6Compressor lock
E7DC fan lock
E8Input overcurrent detection
EAFourWay valve abnormality
F3Discharge pipe temperature control
F6High pressure control in cooling
H0Compressor system sensor abnormality
H6Position sensor abnormality
H8DC voltage / current sensor abnormality - CT or related abnormality
H9Outdoor temperature thermistor or related abnormality
J3Discharge pipe thermistor or related abnormality
J6Outdoor heat exchanger thermistor or related abnormality
L3Electrical box temperature rise
L4Radiation fin temperature rise
L5Output overcurrent detection
P4Radiation fin thermistor or related abnormality
U7Signal transmission error on outdoor unit PCB
Indoor Unit PCB Abnormality;
Remote Controller Display: A1
Supposed Causes:
  • Wrong models interconnected
  • Defective indoor unit PCB
  • Disconnection of connector
  • Reduction of power supply voltage
Remote Controller Display: A5
Supposed Causes:
  • Short-circuited air
  • Clogged air filter of the indoor unit
  • Dust accumulation on the indoor heat exchanger
  • Defective indoor heat exchanger thermistor
  • Defective indoor unit PCB
Remote Controller Display: A6
Supposed Causes:
  • Layer short inside the fan motor winding
  • Breaking of wire inside the fan motor
  • Breaking of the fan motor lead wires
  • Defective capacitor of the fan motor
  • Defective indoor unit PCB
Remote Controller Display: C4, C9
Supposed Causes:
  • Disconnection of connector
  • Defective thermistor
  • Defective indoor unit PCB
Remote Controller Display: U0

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