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
Outdoor Unit
H5
Malfunction of compressor motor
overload thermistor
Defect of compressor motor overload thermistor
Defective connector contact
k
k
H6
Malfunction of position detection
sensor
Faulty contact of compress or cable
Defective compressor
Defective outdoor unit PCB
k
k
k
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
k k k
k
H8
Malfunction of compressor input
(CT) system
Defective power transistor
Defective reactor
Faulty wiring of inverter system
Defective outdoor unit PCB
k
k
H9
Malfunction of outdoor air
thermistor
Defective connection of thermistor
Defective outdoor unit PCB
Defective outdoor air thermistor
k k k k
k
HC
Malfunction of (hot) water
temperature thermistor
Defective connection of thermistor
Defective outdoor unit PCB
Defective water temperature thermistor
k k
k
HF
Alarm in thermal storage unit or
storage controller
Thermal storage group defective wiring
Defective setting
Excess of thermal storage tank numbers
k
HJ
Malfunction of thermal storage
tank water level
Low water level
Defective switch setting
Water level detecting sensor failure
Defective connector contact
k k k k
J1
Malfunction of pressure sensor
Defective pressure sensor connector contact
Defective pressure sensor
Defective outdoor unit PCB
k k k
k
J2
Malfunction of current sensor of
compressor
Defective current sensor
Defective compressor
Defective outdoor unit PCB
k k k k
k
J3
Malfunction of discharge pipe
thermistor
Defective connection of thermistor
Defective discharge pipe thermistor
Defective outdoor unit PCB
k k k k
k
J4
Malfunction of low pressure
equivalent saturated temperature
sensor system
Defective connection of thermistor
Defective thermistor
Defective outdoor unit PCB
k
k
J5
Malfunction of suction pipe
thermistor
Defective connection of thermistor
Defective suction pipe thermistor
Defective outdoor unit PCB
k k k
k
J6
Malfunction of heat exchanger
thermistor
Defective connection of thermistor
Defective heat exchanger thermistor
Defective outdoor unit PCB
k k k k
k
J7
Malfunction of thermistor
(Refrigerant circuit)
Defective connection of thermistor
Defective liquid pipe thermistor
Defective outdoor unit PCB
k k k
k
J8
Malfunction of thermistor
(Refrigerant circuit)
Defective connection of thermistor
Defective liquid pipe thermistor
Defective outdoor unit PCB
k k k k
k
J9
Malfunction of thermistor
(Refrigerant circuit)
Defective connection of thermistor
Defective gas pipe thermistor
Defective outdoor unit PCB
k k k k
k
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
k k k
k
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
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
JE
Malfunction of oil pressure sensor
or sub-tank thermistor
Defective connector contact
Defective sub-tank thermistor
Defective outdoor unit PCB
k
JF
Malfunction of oil level sensor or
heating heat exchanger thermistor
Defective connector contact
Defective heat exchanger thermistor
Defective outdoor unit PCB
k
L0
Malfunction of inverter system
Shortage of power supply capacity
Defective power transistor
Defective outdoor unit PCB
k
k
L1
Malfunction of inverter PCB
Defective compressor wiring
Defective outdoor unit fan motor
Blown fuse
Defective inverter PCB
k k k
k
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
k k k
k
L4
Malfunction of inverter radiation fi n
temperature rise
Fin temperature rise due to short circuit
Defective fi n thermistor
k k k k
k
L5
nverter instantaneous overcurrent
(DC output)
Defective compressor coil (such as wiring disconnection or
insulation failure)
Compressor startup failure (mechanical lock)
Defective inverter PCB
k k k k
k
L6
Inverter instantaneous overcurrent
(AC output)
Overcharge of refrigerant amount
Shortage of power supply capacity
Defective compressor
Defective inverter unit
k
k
L8
Malfunction of overcurrent inverter
compressor
Compressor overloaded
Wiring disconnection in compressor coil
Disconnection of compressor wiring
Defective inverter PCB
k k k k
k
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
k k k
k
LA
Malfunction of power transistor
Defective power transistor
Defective compressor
Defective inverter PCB
k
k
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)
k k k k
k
M1
Malfunction of central remote
controller PCB
Defective central remote controller PCB
k k k k
k
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
k k k k
k
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
k k k k
k
MC
Address duplication, improper
setting
Address duplication of central remote controller
k k k k
k
P0
Shortage of refrigerant amount
(thermal storage unit)
Shortage of refrigerant
Clogged refrigerant piping
k
k
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
k k k
k
