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