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Malfunction
Malfunction Contents
code
P2
Automatic refrigerant charge
The stop valve is not opened
operation stop
Closed valve of refrigerant tank
Malfunction of thermistor in switch
Defective connection of thermistor
P3
box
Defective reactor thermistor
Defective inverter PCB
Malfunction of radiation fi n
Defective radiation fi n temperature thermistor
temperature sensor
Defective inverter PCB
P4
Defective INV. compressor
Defective fan motor
Heat exchanger freezing protection
(Close the refrigerant cylinder. Start again from step 1.)
P8
during automatic refrigerant
charging
Malfunction of fan motor
Defective fan motor
P9
(humidifi er unit)
Defective outdoor unit PCB
Broken relay harness
Defective connector contact
P9
Automatic refrigerant charge
—
operation completed
PA
Refrigerant cylinder during
Refrigerant cylinder of master unit is empty
automatic refrigerant charging
Broken wire of heater
Defective heater unit
PA
(humidifi er unit)
Defective thermistor
Defective outdoor unit PCB
PC
Refrigerant cylinder during
Refrigerant cylinder of slave unit 2 is empty
automatic refrigerant charging
PE
Automatic refrigerant charge
—
operation nearly completed
Refrigerant cylinder during
Defective heater unit
automatic refrigerant charging
Defective connector contact
PH
Defective thermistor
Defective outdoor unit PCB
Malfunction of capacity setting
Capacity setting adaptor is not installed
PJ
(Outdoor unit PCB)
Improper capacity setting adaptor
Defective outdoor unit PCB
Improper combination between
Mis-matching of type of PCB
PJ
inverter and fan driver
Improper (or no) fi eld setting after replacing outdoor unit
main PCB
Shortage of refrigeran
Refrigerant shortage and refrigerant clogging (wrong
piping)
U0
Defective thermistor
Defective low pressure sensor
Defective outdoor unit main PCB
Reverse phase, open phase
Power supply reverse phase
U1
T phase open phase
Defective outdoor unit PCB (A1P)
Malfunction of power supply or
Abnormal power supply voltage
U2
instantaneous power failure
Instantaneous power failure
Defective main circuit wiring
U3
Check operation not executed or
Check operation is not executed.
transmission error
Malfunction of transmission
Short circuit in indoor-outdoor or outdoor-outdoor
between indoor and outdoor unit
transmission wiring (F1 / F2), or wrong wiring
U4
Outdoor unit power supply is OFF
System address does not match
Defective indoor unit PCB
Defective outdoor unit PCB
Malfunction of transmission
Transmission error between indoor unit and remote
between indoor unit and remote
controller
controller
Connection of 2 main remote controllers (when using 2
U5
remote controllers)
Defective indoor unit PCB
Defective remote controller PCB
Transmission error caused by noise
Malfunction of transmission
Faulty wiring
U6
between indoor units
External factor (Noise etc.)
Defective indoor unit PCB
Simple Self-Diagnosis by Malfunction Code
Objects
Supposed causes
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Malfunction
Malfunction Contents
code
k
Malfunction of transmission
between outdoor units or outdoor
U7
storage unit
k
Malfunction of transmission
U8
between remote controllers
k
Malfunction of transmission (other
system)
U9
Defect of indoor/outdoor power
UA
supply
Improper combination of indoor
and outdoor units
UA
UA
Remote temperature setting wire
disconnection
UC
Malfunction of setting of centralized
control equipment address
Malfunction of transmission
between indoor unit and
centralized control equipment
UE
System is not set yet
k
UF
k
Malfunction of system
UH
UJ
Malfunction of transmission
(accessory device)
External protection device
k k
60
activated (Heat reclaim ventilator)
Malfunction of indoor air thermistor
64
(Heat reclaim ventilator)
Malfunction of outdoor air
65
thermistor (Heat reclaim ventilator)
Malfunction of damper system
6A
(Heat reclaim ventilator)
k k
System No. 2
70
Compressor overheat
System No. 2
71
k k
Compressor overcurrent
Supposed causes
Connection error of transmission wirings between outdoor
unit and external control adaptor for outdoor unit
Connection error of transmission wirings between outdoor
units
Defective outdoor unit PCB
Transmission error between main and sub remote
controller
Connection between sub remote controllers
Defective remote controller PCB
Transmission error between other indoor and outdoor units
Defective electronic expansion valve of other indoor unit
Defective indoor unit PCB of other indoor unit
Improper connection of transmission wiring between
indoor and outdoor unit
Wrong model connections
Improper power supply
Wrong PCB connected
Defective PCB
Excess of connected indoor units
Defective outdoor unit PCB
Mismatch of the refrigerant type of indoor and outdoor unit
Setting of outdoor unit PCB was not carried out after
replacing to spare PCB
Remote temperature setting wire disconnection
Defective connector contact
Address duplication of centralized control equipment
Defective indoor unit PCB
Transmission error between optional controllers for
centralized control equipment and indoor unit
Connector for setting main controller is disconnected.(or
disconnection of connector for independent / combined
use changeover switch.)
Defective PCB for central remote controller
Defective indoor unit PCB
Improper connection of transmission wiring between
indoor-outdoor units and outdoor-outdoor units
Failure to execute check operation
Defective indoor unit PCB
Stop valve is not opened
Improper connection of transmission wiring between
indoor-outdoor units and outdoor-outdoor units
Defective indoor unit PCB
Defective outdoor unit PCB
Defect of accessory devices
Faulty wiring
Actuation of external protection device
Defective output signal wiring
Defective control PCB
Defective connector contact
Defective indoor air thermistor
Defective control PCB
Defective connector contact
Defective outdoor air thermistor
Defective control PCB
Defective connector contact
Defective limit switch
Defective damper motor
Defective control PCB
Shortage of refrigerant amount
Defective connector contact
Leakage of four way valve
Shortage of refrigerant amount
Short circuit
Defective compressor
Objects
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