Daikin AC Error Codes

1. Split AC Error Codes
2. L Series AC Error Codes
3. Multi AC Error Codes
4. VRV  IV 4 Error Codes
5. VRV III 3 Error Codes

1-Daikin Split AC Error Codes:

Error Codes	Problem
00	Normal
UA	Indoor-outdoor Unit Combination Fault
U0	Refrigerant Shortage
U2	Drop Voltage Or Main Circuit Overvoltage
U4	Failure Of Transmission (Between Indoor Unit And Outdoor Unit)
A1	Indoor Pcb Defectiveness
A5	High-Pressure Control Or Freeze-up Protector
A6	Fan Motor Fault
C4	Faulty Heat Exchanger Temperature Sensor
C9	Faulty Suction Air Temperature Sensor

2- Daikin L Series AC Error Codes:

Error Codes	Meaning
System Error Codes
00	Normal
U0	U0
U2	Low-voltage detection or over-voltage detection
U4	Signal transmission error (between indoor unit and outdoor unit)
UA	Unspecified voltage (between indoor unit and outdoor unit)
Indoor Unit Error Codes
A1	Indoor unit PCB abnormality
A5	Freeze-up protection control or heating peak-cut control
A6	Fan motor or related abnormality
C4	Indoor heat exchanger thermistor or related abnormality
C9	Room temperature thermistor or related abnormality
Outdoor Unit Error Codes
E1	Outdoor unit PCB abnormality
E5	OL activation (compressor overload)
E6	Compressor lock
E7	DC fan lock
E8	Input overcurrent detection
EA	FourWay valve abnormality
F3	Discharge pipe temperature control
F6	High-pressure control in cooling
H0	Compressor system sensor abnormality
H6	Position sensor abnormality
H8	DC voltage / current sensor abnormality - CT or related abnormality
H9	Outdoor temperature thermistor or related abnormality
J3	Discharge pipe thermistor or related abnormality
J6	Outdoor heat exchanger thermistor or related abnormality
L3	Electrical box temperature rise
L4	Radiation fin temperature rise
L5	Output overcurrent detection
P4	Radiation fin thermistor or related abnormality
U7	Signal transmission error on outdoor unit PCB

Indoor Unit PCB Abnormality;
Remote Controller Display: A1
Supposed Causes:

• When We This Error The Problem Is interconnected Is Wrong models
• Defective indoor unit PCB After See This Error
• Disconnection of connector
• Reduction of power supply voltage

Remote Controller Display: A5
Supposed Causes:

• When You See This Error So You Ac Is Short-circuited air
• Clogged air filter of the indoor unit When We See A5 Error
• After See This Error That Means Dust accumulation on the indoor heat exchanger
• Defective indoor heat exchanger thermistor
• When This happens Your Ac Have Defective indoor unit PCB

Remote Controller Display: A6
Supposed Causes:

• After See This Error That Means Layer short inside the fan motor winding
• Breaking of wire inside the fan motor
• Breaking of the fan motor lead wires
• When On Display Is A6 Means Defective capacitor of the fan motor
• After Again And Again See This Error Maybe Defective indoor unit PCB

Remote Controller Display: C4, C9
Supposed Causes:

• Disconnection of connector
• thermistor Defective
• Defective indoor unit PCB

Solve Daikin Ac Troubleshooting

Remote Controller Display: U0
Supposed Causes:

• Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor, room or outdoor temperature thermistor
• Closed stop valve
• Refrigerant shortage (refrigerant leakage)
• Poor compression performance of compressor
• Defective electronic expansion valve

Remote Controller Display: U2
Supposed Causes:

• Supply voltage is not as specified.
• DC voltage detection circuit
• e over-voltage detection circuit
• PAM control part
• Disconnection of compressor harness
• When See U2 That Means Maybe Noise Problem
• Momentary fall of voltage
• Momentary power failure
• Defective indoor unit PCB

Remote Controller Display: U4
Supposed Causes:

• First Cause Of This Error Is Wiring error
• Breaking of the connection wires between the indoor and outdoor units (wire No. 3)
• outdoor unit PCB Is Faulty
• Defective indoor unit PCB
• Disturbed power supply waveform

Remote Controller Display: U7

Supposed Causes: That Means Defective Is outdoor unit PCB
Remote Controller Display: UA
Supposed Causes:

• Wrong models interconnected
• wiring of connecting wires Is Wrong
• Wrong indoor unit PCB or outdoor unit PCB mounted
• Defective indoor unit PCB
• Defective outdoor unit PCB

Remote Controller Display: E1

Supposed Causes:

• outdoor unit PCB Defective
• Broken harness between PCBs
• Noise
• Momentary fall of voltage
• Momentary power failure, etc

Remote Controller Display: E5
Supposed Causes:

• Discharge pipe thermistor
• Defective electronic expansion valve or coil
• When You See This Error That Means FourWay valve or coil Is Faulty
• After Again See This Error Defective outdoor unit PCB
• Refrigerant shortage Problem When We See This
• Water mixed in refrigerant
• Defective stop valve

Remote Controller Display: E6

• Compressor locked After This Error Show On Display
• When We See E6 Error Compressor harness disconnected

Remote Controller Display: E7
Supposed Causes:

• Foreign matter stuck in the fan
• When You See This E7 That Means Defective fan motor
• outdoor unit PCB Is Faulty After We See This Error

Remote Controller Display: E8
Supposed Causes:

• After See This Error On Display Means Outdoor temperature is out of operation range.
• Wen We See This Error Means Defective compressor
• power module Is Faulty When We See This
• Faulty Is outdoor unit PCB
• Short circuit

Remote Controller Display: EA
Supposed Causes:

• Disconnection of fourway valve coil
• Defective fourway valve, coil, or harness
• After See This Error On Diplay MAybe outdoor unit PCB
• thermistor Is Faulty
• Refrigerant shortage
• Water mixed in refrigerant When You See This
• After Again See This Error That Means stop valve Is Not Good

Remote Controller Display: F3

Supposed Causes:

• When See This Error Maybe discharge pipe thermistor
• Fault In electronic expansion valve or coil
• When See This Is Error Means Refrigerant shortage
• Defective fourway valve
• Water mixed in refrigerant
• stop valve Is Faulty
• PCB Of Outdoor Unit Is Defective

Remote Controller Display: F6
Supposed Causes:

• The installation space is not large enough.
• Dirty outdoor heat exchanger
• outdoor fan motor
• stop valve
• electronic expansion valve or coil
• outdoor heat exchanger thermistor
• outdoor unit PCB

Remote Controller Display: H0
Supposed Causes:

• Broken or disconnected harness
• outdoor unit PCB Is Faulty

Remote Controller Display: H6
Supposed Causes:

• Disconnection of the compressor relay cable
• compressor Not Good
• teoutdoor unit PCB Is not Good
• Start-up failure caused by the closed stop valve
• Input voltage is outside the specified range.

Remote Controller Display: H8
Supposed Causes:  outdoor unit PCB Is Not Working
Remote Controller Display: H9, J3, J6, P4
Supposed Causes:

• Disconnection of the connector for the thermistor
• thermistor corresponding to the error code
• heat exchanger thermistor in the case of J3 error
• outdoor unit PCB

Remote Controller Display: L3
Supposed Causes:

• outdoor fan motor
• When Again See This That Means Short circuit
• Radiation fin thermistor Is Faulty When You See This
• Disconnection of connector
• PCB Of Outdoor Unit Is Faulty

Remote Controller Display: L4

Supposed Causes:

• When We L4 Error That Means fan motor Of Outdoor Unit Is Faulty
• And The Second Issue Is Short circuit
• And The Another One is Defective radiation fin thermistor
• When See This Error 4th Issue Is Disconnection of connector
• After Face L4 Maybe outdoor unit PCB
• When You See L4 Is On Display Maybe That Means Silicon grease is not applied properly on the radiation fin after replacing the outdoor unit PCB.

Remote Controller Display: L5
Supposed Causes:

• When L5 On Display That Means Poor installation condition
• And Second One Is Closed stop valve
• After See L5 Maybe power module Is Faulty
• If We Face Again That Means Wrong internal wiring
• L5 Error Other Means Abnormal power supply voltage
• When You See Again This Problem In outdoor unit PCB
• After Again And Again See This Error Last Means Your compressor Is Not Working

Service Check Function

1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature display screen.
2. After That Press the timer cancel button repeatedly until a long beep sounds.

3-Daikin Multi-Split Type AC Error Codes:

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2/3/4MXS-G/J Series/Heat Pump

Error Codes	Problem
00	Normal
UA	Indoor-Outdoor Unit Combination Fault
U0	Refrigerant Shortage
U2	Drop Voltage or Main Circuit Overvoltage
U4	Failure Of Transmission (Between Indoor Unit and Outdoor Unit)
A1	Indoor PCB Defectiveness
A5	High Pressure Control or Freeze-up Protector
A6	Fan Motor Fault
C4	Faulty Heat Exchanger Temperature Sensor
C9	Faulty Suction Air Temperature Sensor
EA	Cooling-Heating Switching Error
E1	Circuit Board Fault
E5	OL Started
E6	Faulty Compressor Start Up
E7	DC Fan Motor Fault
E8	Overcurrent Input
F3	High Temperature Discharge Pipe Control
F6	High Pressure Control (In Cooling)
H0	Sensor Fault
H6	Operation Halt Due To Faulty Position Detection Sensor
H8	DC Current Sensor Fault
H9	Faulty Suction Air Temperature Sensor
J3	Faulty Discharge Pipe Temperature Sensor
J6	Faulty Heat Exchanger Temperature Sensor
L3	Electrical Parts Heat Fault
L4	High Temperature At Inverter Circuit Heatsink
L5	Output Overcurrent
P4	Faulty Inverter Circuit Heatsink Temperature Sensor