Daikin Air Conditioning Perth by Airpro Airconditioning

Air conditioning Perth since 1999

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Daikin Air Conditioning Error Fault Codes and Self Diagnosis Explained

How to identify what is required with your Daikin Aircon via the self diagnosis error code.

Jump to – Indoor Unit or  Outdoor Unit Error Codes

indoor error code   Outdoor Error Codes

Airpro provide the following Daikin Error Fault code. To protect your warranty contact Airpro with your Daikin error code and discuss with us your options for rectifying the issue. Airpro can diagnose all Daikin Air conditioning fault and error codes.





Airpro service all Perth areas and can supply Daikin spare parts to resolve your daikin error code.

Daikin Error Code & Fault Description

Indoor Unit

Daikin Error Code Error Message Cause of error - Problem and likely repair needed
A0 External protection device activated External protection device connected to the terminal strip T1-T2 of indoor unit is activated
A1 Malfunction of indoor unit PCB Defective indoor unit PCB.
External factor (Noise etc.)
A3 Drain Level Control System Abnormality Drain clogging, upward slope, etc.
Defective drain pump.
Defective float switch or short circuit connector.
A4 Malfunction of freezing protection Shortage of water volume.
Low water temperature setting.
Defective water temperature thermistor.
A5 High pressure control in heating, freeze-up protection control in cooling Clogged air filter of indoor unit and short circuit Defect of indoor unit heat exchanger thermistor
A6 Malfunction of fan motor Broken wires in, short circuit of, or disconnection of connectors from the fan motor harness.
Defective indoor unit PCB.
Defective fan motor.
A7 Malfunction of swing flap motor Defective swing flap motor.
Defective indoor unit PCB.
Defective connection cable.
Defective airflow direction adjusting flap-cam.
A8 Malfunction of power supply or AC input overcurrent Defective power supply voltage.
Defective connection on signal line.
Defective wiring.
A9 Malfunction of electronic expansion valve Defective electronic expansion valve coil.
Defective indoor unit PCB.
Defective relay cables.
AA Heater overheat 26WH is activated
AF Malfunction of a humidifier system Humidifier unit (optional accessory) leaking.
Defective drain piping (upward slope, etc.).
Defective indoor unit PCB.
AH Malfunction of dust collector of air cleaner Defect of dust collecting element.
Stained insulator part.
Defect of high voltage power supply unit.
Defect of indoor unit PCB.
AJ Malfunction of capacity setting (Indoor unit PCB) The capacity setting adaptor was not installed when replacing PCB.
Defective indoor unit PCB.
C1 Failure of transmission (between indoor unit PCB and sub PCB) Defective connection of the connector between indoor unit PCB
C4 Malfunction of liquid pipe thermistor for heat exchanger. Defective thermistor for liquid pipe .
Defective indoor unit PCB.
Defective connector contact.
C5 Malfunction of gas pipe thermistor for heat exchanger. Defective thermistor for gas pipe.
Defective indoor unit PCB.
Defective connector contact.
C6 Malfunction of fan motor sensor or fan control driver. Defective fan PCB.
Defective connection of capacity setting adaptor Field setting error.
C7 Front panel driving motor fault. Defective front panel driving motor Defective limit switch.
C9 Malfunction of suction air thermistor. Defective thermistor for suction air.
Defective indoor unit PCB.
Defective connector contact.
CA Malfunction of discharge air thermistor. Defective thermistor for discharge air.
Defective indoor unit PCB.
Defective connector contact.
CC Malfunction of humidity sensor system. Defective humidity sensor Defective connector contact.
Cj Room temperature thermistor in remote controller abnormality. Defective room temperature thermistor in remote controller.
Defective remote controller PCB.
External factor (Noise etc.)

Outdoor Unit




Daikin Error Code Error Message Cause of Error - Problem and likely repair needed
E0 Protection devices activated (unifi ed) Protection device connected to outdoor unit PCB actuated Defective protection device connector contact
E1 Defective outdoor unit PCB Defective outdoor unit PCB
Defective connection of inside/ outside relay wires
E3 Actuation of high pressure switch (HPS) Dirty outdoor unit heat exchanger
Defective high pressure switch
Clogged refrigerant piping
Defective connector contact
E3 System No.1 Dirty outdoor unit heat exchanger
Actuation of high pressure switch Shortage of water volume
(HPS) Clogged refrigerant piping
Defective connector contact
Defective HPS
E4 Actuation of low pressure switch (LPS) Abnormally drop in low pressure
Defective low pressure sensor
Defective outdoor unit PCB
Defective connector contact
E5 Inverter compressor motor or overheat Inverter compressor lock
High differential pressure
Defective inverter PCB
UVW connection error
Defective connector contact
E6 STD compressor motor overcurrent/lock Defective compressor
Defective control PCB
The stop valve is not opened
E6 System No.1 Compressor overcurrent Defective electronic expansion valve
Shortage of refrigerant amount
Defective compressor
E7 Malfunction of outdoor unit fan motor system Fan motor failure
Neglect to connect or defective connection of harness/ connector between the fan motor and the PCB
Fan does not rotate due to foreign matters caught in it
E8 Overcurrent of inverter compressor Defective compressor
Defective inverter main circuit capacitor
Defect of outdoor unit PCB
Defect of power transistor
E9 Malfunction of electronic expansion valve coil Disconnection of connectors from electronic expansion valves
Defective electronic expansion valve coil
Defective outdoor unit control PCB
EA Malfunction of four way valve or cool/heat switchin Defective four way valve
Shortage of gas
Defective outdoor unit PCB
Defective thermistor
EC Malfunction of entering water temperature Cooling water temperature abnormality
Defective outdoor unit PCB Defective thermistor
F3 Malfunction of discharge pipe temperature Defective discharge pipe thermistor
Abnormal discharge pipe temperature
Defective outdoor unit control PCB
Defective connector contact
F6 Abnormal high pressure or refrigerant overcharged Refrigerant overcharged
Disconnection of heat exchanger deicer thermistor
Disconnection of outdoor air thermistor
Disconnection of liquid pipe temperature thermistor
Defective outdoor unit PCB
H0 Malfunction of sensor system of compressor Harness is disconnected, or defective connection Defective PCB
H1 Malfunction of room temperature sensor or humidifi er unit damper Defective limit switch Defective damper
H3 Malfunction of high pressure switch (HPS) Defective high pressure switch Broken wire
Defective outdoor unit PCB
Defective connector contact
H4 Malfunction of low pressure switch (LPS) Defective low pressure switch
Broken wire
Defective outdoor unit PCB
Defective connector contact
H5 Malfunction of compressor motor overload thermistor Defect of compressor motor overload thermistor Defective connector contact
H6 Malfunction of position detection sensor Faulty contact of compress or cable
Defective compressor
Defective outdoor unit PCB
H7 Malfunction of outdoor unit fan motor signal Abnormal signal from fan motor (Circuit failure) Disconnection/Short circuit in fan motor leads or disconnection of connector Defective inverter PCB
H8 Malfunction of compressor input (CT) system Defective power transistor
Defective reactor
Faulty wiring of inverter system
Defective outdoor unit PCB
H9 Malfunction of outdoor air thermistor Defective connection of thermistor
Defective outdoor unit PCB
Defective outdoor air thermistor
HC Malfunction of (hot) water temperature thermistor Defective connection of thermistor
Defective outdoor unit PCB
Defective water temperature thermistor
HF Alarm in thermal storage unit or storage controller Thermal storage group defective wiring
Defective setting
Excess of thermal storage tank numbers
HJ Malfunction of thermal storage tank water level Low water level
Defective switch setting
Water level detecting sensor failure
Defective connector contact
J1 Malfunction of pressure sensor Defective pressure sensor connector contact
Defective pressure sensor
Defective outdoor unit PCB
J2 Malfunction of current sensor of compressor Defective current sensor
Defective compressor
Defective outdoor unit PCB
J3 Malfunction of discharge pipe thermistor Defective connection of thermistor
Defective discharge pipe thermistor
Defective outdoor unit PCB
J4 Malfunction of low pressure equivalent saturated temperature sensor system Defective connection of thermistor
Defective thermistor
Defective outdoor unit PCB
J5 Malfunction of suction pipe thermistor Defective connection of thermistor
Defective suction pipe thermistor
Defective outdoor unit PCB
J6 Malfunction of heat exchanger thermistor Defective connection of thermistor
Defective heat exchanger thermistor
Defective outdoor unit PCB
J7 Malfunction of thermistor (Refrigerant circuit) Defective connection of thermistor
Defective liquid pipe thermistor
Defective outdoor unit PCB
J8 Malfunction of thermistor (Refrigerant circuit) Defective connection of thermistor
Defective liquid pipe thermistor
Defective outdoor unit PCB
J9 Malfunction of thermistor (Refrigerant circuit) Defective connection of thermistor
Defective gas pipe thermistor
Defective outdoor unit PCB
JA Malfunction of high pressure sensor Defective connector contact
Connection of low pressure sensor in mistake for high pressure sensor
Defective high pressure sensor
Defective outdoor unit PCB
JC Malfunction of low pressure sensor Defective connector contact
Connection of high pressure sensor in mistake for low pressure sensor
Defective low pressure sensor
Defective outdoor unit PCB
JE Malfunction of oil pressure sensor or sub-tank thermistor Defective connector contact
Defective sub-tank thermistor
Defective outdoor unit PCB
JF Malfunction of oil level sensor or heating heat exchanger thermistor Defective connector contact
Defective heat exchanger thermistor
Defective outdoor unit PCB
L0 Malfunction of inverter system Shortage of power supply capacity
Defective power transistor
Defective outdoor unit PCB
L1 Malfunction of inverter PCB Defective compressor wiring
Defective outdoor unit fan motor
Blown fuse
Defective inverter PCB
L3 El.compo. box temperature rise Fin temperature rise due to short circuit
Defective outdoor unit fan motor
Defective power transistor
Defective outdoor unit PCB
L4 Malfunction of inverter radiation fi n temperature rise Fin temperature rise due to short circuit Defective fi n thermistor
L5 nverter instantaneous overcurrent (DC output) Defective compressor coil (such as wiring disconnection or insulation failure)
Compressor startup failure (mechanical lock)
Defective inverter PCB
L6 Inverter instantaneous overcurrent (AC output) Overcharge of refrigerant amount
Shortage of power supply capacity
Defective compressor Defective inverter unit
L8 Malfunction of overcurrent inverter compressor Compressor overloaded
Wiring disconnection in compressor coil
Disconnection of compressor wiring
Defective inverter PCB
L9 Malfunction of inverter compressor startup error (Stall prevention) The stop valve is not opened
Defective compressor
Error in wire connections to compressor
Large differential pressure before compressor startup Defective inverter PCB
LA Malfunction of power transistor Defective power transistor
Defective compressor
Defective inverter PCB
LC Malfunction of transmission between control and inverter PCB Defective connection between the inverter PCB and the control PCB
External factors (e.g. noise)
Defective inverter compressor
Defective control PCB (transmission block)
M1 Malfunction of central remote controller PCB Defective central remote controller PCB
M8 Malfunction of transmission between optional controllers for centralized control Other centralized control power disconnection
Centralized control reset switch ON
Defective transmission wiring
Central remote controller address change
MA Improper combination of optional controllers for centralized control Improper combination of optional controllers for centralized control
More than one master controller is connected
Faulty setting of centralized control
Defect of centralized control
MC Address duplication, improper setting Address duplication of central remote controller
P0 Shortage of refrigerant amount (thermal storage unit) Shortage of refrigerant
Clogged refrigerant piping
P1 Power voltage imbalance or inverter PCB Open phase
Interphase voltage imbalance
Defective capacitor in the main circuit
Defective wiring in the main circuit
Defective inverter PCB
P2 Automatic refrigerant charge operation stop The stop valve is not opened Closed valve of refrigerant tank
P3 Malfunction of thermistor in switch box Defective connection of thermistor
Defective reactor thermistor
Defective inverter PCB
P4 Malfunction of radiation fi n temperature sensor Defective radiation fi n temperature thermistor
Defective inverter PCB
Defective INV. compressor
Defective fan motor
P8 Heat exchanger freezing protection during automatic refrigerant charging (Close the refrigerant cylinder. Start again from step 1.)
P9 Malfunction of fan motor (humidifi er unit) Defective fan motor
Defective outdoor unit PCB
Broken relay harness
Defective connector contact
P9 Automatic refrigerant charge operation completed —
PA Refrigerant cylinder during automatic refrigerant charging Refrigerant cylinder of master unit is empty
PA Broken wire of heater (humidifi er unit) Defective heater unit
Defective thermistor
Defective outdoor unit PCB
PC Refrigerant cylinder during automatic refrigerant charging Refrigerant cylinder of slave unit 2 is empty
PE Automatic refrigerant charge operation nearly completed —
PH Refrigerant cylinder during automatic refrigerant charging Defective heater unit
Defective connector contact
Defective thermistor
Defective outdoor unit PCB
PJ Malfunction of capacity setting (Outdoor unit PCB) Capacity setting adaptor is not installed
Improper capacity setting adaptor
Defective outdoor unit PCB
PJ Improper combination between inverter and fan driver Mis-matching of type of PCB
Improper (or no) fi eld setting after replacing outdoor unit main PCB

AO Indoor Error of external protection device
A1 Indoor PCB defect
A3 Indoor Malfunction of drain Level control system
A5 Indoor Freeze-up prevention
A6 Indoor Fan motor lock, Overload
A7 Indoor Malfunction of swing motor flap
A9 Indoor Malfunction of EEV
AF Indoor Drain level above limit (clogging)
AJ Indoor Malfunction of capacity set device
C3 Indoor Malfunction of drain thermistor
C4 Indoor Malfunction of liquid pipe thermistor
C5 Indoor Malfunction of gas pipe thermistor
C7 Indoor Lower louvre limit switch/motor
C9 Indoor Malfunction of air thermistor
CC Indoor Malfunction of moisture sensor
CA Indoor Malfunction of discharge air thermistor
CJ Indoor Malfunction of remote control thermistor
CE Indoor Malfunction of radiant heat sensor
E0 Outdoor Activation of outdoor safety device
E1 Outdoor PCB defect
E3 Outdoor Activation of high pressure switch
E4 Outdoor Activation of low pressure switch
E5 Outdoor Activation of compressor over heat protection
E5 Outdoor Compressor motor lock
E6 Outdoor Compressor start up error
E6 Outdoor Standard compressor lock/over current
E7 Outdoor Fan motor lock, Overload
E8 Outdoor Inverter input over current
E9 Outdoor Malfunction of EEV
EA Outdoor Four way valve defective
F3 Outdoor Abnormal discharge pipe temperature
F6 Outdoor Refrigerant overcharged
FC Outdoor Low pressure drop.
H3 Outdoor High pressure switch defect
H4 Outdoor Low pressure switch defect
H6 Outdoor Compressor motor position detection sensor error
H7 Outdoor Fan motor position detection sensor error
H8 Outdoor Current transformer error
H9 Outdoor Malfunction of air thermistor




J1 Outdoor Malfunction of pressure sensor
J2 Outdoor Current sensor malfunction
J3 Outdoor Malfunction of discharge pipe thermistor
J4 Outdoor Low pressure saturation thermistor
J5 Outdoor Malfunction of suction pipe thermistor
J6 Outdoor Malfunction of heat exchanger thermistor
J7 Outdoor Malfunction of heat exchanger liquid thermistor
J8 Outdoor Malfunction of liquid pipe thermistor
J9 Outdoor Malfunction of gas pipe thermistor
JA Outdoor Malfunction of discharge pipe pressure sensor
JC Outdoor Malfunction of suction pipe pressure sensor
JH Outdoor Malfunction of oil temperature sensor
L0 Outdoor Malfunction of inverter
L3 Outdoor Electronic component box overheat
L4 Outdoor Inverter cooling defect
L5 Outdoor Comp motor ground fault, Short circuit
L6 Outdoor Compressor motor grounding/short circuit
L7 Outdoor Total input overcurrent
L8 Outdoor Comp overload, Motor disconnected
L9 Outdoor Compressor lock
LA Outdoor Power unit malfunction
LC Outdoor Transmission between inverter & outdoor
P1 Outdoor Inverter over ripple
P3 Outdoor Thermistor abnormality
P4 Outdoor Power unit humidity sensor malfunction
PJ Outdoor Failure of capacity set resistor
U0 System Shortage of refrigerant or EEV failure
U1 System Negative phase, Open phase
U2 System Power supply insufficient
U3 System Wiring check operation not executed
U3 System Mismatch of indoor and outdoor units (Split only)
U4 System Transmission between indoor units
U5 System Transmission to remote controller
U6 System Malfunction transmission outdoor to BP unit
U7 System Transmission between outdoor units
U7 Outdoor Malfunction between outdoor boards(RMX/RX RK)
U8 System Transmission between master & slave R/C
U9 System Transmission error between indoor to outdoor
UA System Excessive number of fancoils
UC System Address duplication of central controllers
UE System Transmission error between indoor & central
UF System Refrigeration system not set/wiring – piping
UF System Terminals 1 and 3 crossed (Split/Skyair)

If you Daikin error code does not show above then please email us with error code for analysis

Email your daikin error code, system model and your contact details and location. Email to [email protected]

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