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Malfunction
Malfunction Contents
code
A0
External protection device
External protection device connected to the terminal strip
activated
T1-T2 of indoor unit is activated
A1
Malfunction of indoor unit PCB
Defective indoor unit PCB
External factor (Noise etc.)
Drain Level Control System
Drain clogging, upward slope, etc.
A3
Abnormality
Defective drain pump
Defective fl oat switch or short circuit connector
Malfunction of freezing protection
Shortage of water volume
A4
Low water temperature setting
Defective water temperature thermistor
High pressure control in heating,
Clogged air fi lter of indoor unit and short circuit
A5
freeze-up protection control in
Defect of indoor unit heat exchanger thermistor
cooling
Malfunction of fan motor
Broken wires in, short circuit of, or disconnection of
A6
connectors from the fan motor harness
Defective fan motor
Defective indoor unit PCB
Malfunction of swing fl ap motor
Defective swing fl ap motor
A7
Defective indoor unit PCB
Defective connection cable
Defective airfl ow direction adjusting fl ap-cam
Malfunction of power supply or AC
Defective power supply voltage
A8
input overcurrent
Defective connection on signal line
Defective wiring
Malfunction of electronic expansion
Defective electronic expansion valve coil
A9
valve
Defective indoor unit PCB
Defective relay cables
AA
Heater overheat
26WH is activated
Malfunction of a humidifi er system
Humidifi er unit (optional accessory) leaking
AF
Defective drain piping (upward slope, etc.)
Defective indoor unit PCB
Malfunction of dust collector of air
Defect of dust collecting element
AH
cleaner
Stained insulator part
Defect of high voltage power supply unit
Defect of indoor unit PCB
Malfunction of capacity setting
The capacity setting adaptor was not installed when
AJ
(Indoor unit PCB)
replacing PCB.
Defective indoor unit PCB
C1
Failure of transmission (between
Defective connection of the connector between indoor
indoor unit PCB and sub PCB)
unit PCB
Malfunction of liquid pipe
Defective thermistor for liquid pipe
C4
thermistor for heat exchanger
Defective indoor unit PCB
Defective connector contact
Malfunction of gas pipe thermistor
Defective thermistor for gas pipe
C5
for heat exchanger
Defective indoor unit PCB
Defective connector contact
Malfunction of fan motor sensor or
Defective fan PCB
C6
fan control driver
Defective connection of capacity setting adaptor
Field setting error
C7
Front panel driving motor fault
Defective front panel driving motor
Defective limit switch
Malfunction of suction air
Defective thermistor for suction air
C9
thermistor
Defective indoor unit PCB
Defective connector contact
Malfunction of discharge air
Defective thermistor for discharge air
CA
thermistor
Defective indoor unit PCB
Defective connector contact
CC
Malfunction of humidity sensor
Defective humidity sensor
system
Defective connector contact
Room temperature thermistor in
Defective room temperature thermistor in remote controller
CJ
remote controller abnormality
Defective remote controller PCB
External factor (Noise etc.)
Simple Self-Diagnosis by Malfunction Code
Objects
Supposed causes
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Malfunction
Malfunction Contents
code
E0
Protection devices activated
(unifi ed)
E1
Defective outdoor unit PCB
Actuation of high pressure switch
k
k
E3
(HPS)
k k
System No.1
Actuation of high pressure switch
E3
(HPS)
Actuation of low pressure switch
E4
(LPS)
Inverter compressor motor or
overheat
E5
STD compressor motor
E6
k
overcurrent/lock
System No.1 Compressor
E6
overcurrent
Malfunction of outdoor unit fan
k
k
E7
motor system
k
Overcurrent of inverter compressor
E8
k
Malfunction of electronic expansion
E9
valve coil
Malfunction of four way valve or
EA
cool/heat switchin
Malfunction of entering water
EC
temperature
Malfunction of discharge pipe
F3
temperature
Abnormal high pressure or
refrigerant overcharged
F6
H0
Malfunction of sensor system of
compressor
k
H1
Malfunction of room temperature
sensor or humidifi er unit damper
Malfunction of high pressure switch
H3
(HPS)
k
Malfunction of low pressure switch
(LPS)
H4
k
Supposed causes
Protection device connected to outdoor unit PCB actuated
Defective protection device connector contact
Defective outdoor unit PCB
Defective connection of inside/ outside relay wires
Dirty outdoor unit heat exchanger
Defective high pressure switch
Clogged refrigerant piping
Defective connector contact
Dirty outdoor unit heat exchanger
Shortage of water volume
Clogged refrigerant piping
Defective connector contact
Defective HPS
Abnormally drop in low pressure
Defective low pressure sensor
Defective outdoor unit PCB
Defective connector contact
Inverter compressor lock
High differential pressure
Defective inverter PCB
UVW connection error
Defective connector contact
Defective compressor
Defective control PCB
The stop valve is not opened
Defective electronic expansion valve
Shortage of refrigerant amount
Defective compressor
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
Defective compressor
Defective inverter main circuit capacitor
Defect of outdoor unit PCB
Defect of power transistor
Disconnection of connectors from electronic expansion valves
Defective electronic expansion valve coil
Defective outdoor unit control PCB
Defective four way valve
Shortage of gas
Defective outdoor unit PCB
Defective thermistor
Cooling water temperature abnormality
Defective outdoor unit PCB
Defective thermistor
Defective discharge pipe thermistor
Abnormal discharge pipe temperature
Defective outdoor unit control PCB
Defective connector contact
Refrigerant overcharged
Disconnection of heat exchanger deicer thermistor
Disconnection of outdoor air thermistor
Disconnection of liquid pipe temperature thermistor
Defective outdoor unit PCB
Harness is disconnected, or defective connection
Defective PCB
Defective limit switch
Defective damper
Defective high pressure switch
Broken wire
Defective outdoor unit PCB
Defective connector contact
Defective low pressure switch
Broken wire
Defective outdoor unit PCB
Defective connector contact
Objects
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