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Daikin Trouble Shooting Guide

Past & Current Models

Daikin Fault Codes

Outdoor Fault Codes
Fault Code Definition

Supposed Causes

Split

Skyair

VRV

Package

L0

Failure of inverter system

Defect power transistor, inverter PCB

L1

Failure of inverter PCB

Blown fuse, defect of inverter PCB, fan motor

L3

Electrical box temperature over 

120°C when comp’ off

Defect of fan motor, PCB,  

power transistor

L4

Fin temperature over 93°C

Failed sensor, short circuit of airflow

L5

Inverter instantaneous DC over 

current

Defect of inverter PCB,  

compressor lock/windings

L6

Inverter instantaneous AC over 

current

Defect of inverter unit,  

compressor lock/windings

L8

Over current of inverter compressor Defect of inverter PCB compressor  

lock/ windings

L9

Inverter compressor start-up  

failure

Defect of inverter PCB compressor  

lock/ windings, refrigerant charge

LA

Failure of power transistor

Defect of power transistor, PCB, compressor

LC

Communication fails between PCB 

& micro-computer

Noise, defect of PCB

LC

Communication fails between  

main & inverter PCB

Defect of inverter PCB, main PCB, fan PCB,  

noise filter, compressor 

P1

Imbalance of power supply

Open phase, imbalance between phases,  

Defect of main capacitor, inverter PCB

P2

Automatic refrigerant charge 

operation stop

Closed stop valve, closed refrigerant cylinder valve

P3

Rise in electrical box temperature

Defect of fin sensor, PCB, rise in  
ambient temperature

P4

Failed radiating fin sensor

Sensor open/short circuit

P8

Coil freeze protection during  
Automatic charging

Close refrigerant cylinder and start again

P9

Failure of humidifier fan motor

Defect of fan motor, PCB

P9

Automatic charge operation 

completed

PA

Broken humidifier heater wire

Blown thermal fuse, broken heater element

PA

Refrigerant cylinder empty

Cylinder on master unit empty

PC

Refrigerant cylinder empty

Cylinder on slave unit  empty

PE

Auto charge nearly completed

PH

Humidifier outlet temperature  
sensor/abnormal heater temp’

Sensor open/short circuit, defect of PCB,  
defect of heater unit

PJ

Capacity not set

Capacity setting adaptor not fitted

PJ

Capacity setting error

Incorrect capacity setting

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