Simple Self-Diagnosis by Malfunction Code
After Sales Service Division
(SM-TS3)
RA, SkyAir,
VRV
, PA, and Heat Reclaim Ventilator
Detail
code
Division
0
1
2
3
4
5
6
7
8
9
A
C
E
F
H
J
Indoor Unit
A
External protection
device activated
Malfunction of
indoor unit PCB
Drain Level
Control System
Abnormality
Malfunction of
freezing protection
High pressure
control in heating,
freeze-up protection
control in cooling
Malfunction of fan
motor
Malfunction of
swing fl ap motor
Malfunction of
power supply or AC
input overcurrent
Malfunction
of electronic
expansion valve
Heater overheat
Stop due to low
water level
Low water level · no
water supply
Malfunction of a
humidifi er system
Malfunction of
dust collector of air
cleaner
Malfunction of
capacity setting
(Indoor unit PCB)
C
Malfunction of
sensor system
(unifi ed)
Failure of
transmission
(between indoor
unit PCB and sub
PCB)
Malfunction of drain
level sensor
Malfunction of liquid
pipe thermistor for
heat exchanger
Malfunction of gas
pipe thermistor for
heat exchanger
Malfunction of fan
motor sensor or fan
control driver
Front panel driving
motor fault
Malfunction of AC
input current sensor
system
Malfunction
of suction air
thermistor
Malfunction of
discharge air
thermistor
Malfunction of
humidity sensor
system
Malfunction
of switch box
thermistor
Malfunction of high
pressure switch
Room temperature
thermistor in
remote controller
abnormality
Outdoor Unit
E
Protection devices
activated (unifi ed)
Defective outdoor
unit PCB
Missing of earth
leakage detection
core
Actuation of high
pressure switch
(HPS)
Actuation of low
pressure switch
(LPS)
Inverter compressor
motor or overheat
STD compressor
motor overcurrent/
lock
Malfunction of
outdoor unit fan
motor system
Overcurrent of
inverter compressor
Malfunction
of electronic
expansion valve coil
Malfunction of four
way valve or cool/
heat switchin
Malfunction of
entering water
temperature
Malfunction of drain
water level
Malfunction of
thermal storage unit
Malfunction of
cooling water pump
Actuation of option
protection device
F
Malfunction of
discharge pipe
temperature
Wet alarm
Abnormal
high pressure
or refrigerant
overcharged
Abnormal high
pressure actuation
of HPS
Abnormal oil
pressure
Abnormal oil level
or shortage of oil
Abnormal high
temperature of
refrigerant oil
Abnormal exhaust
temperature of
engine
H
Malfunction of
sensor system of
compressor
Malfunction of room
temperature sensor
or humidifi er unit
damper
Malfunction of
power supply
sensor
Malfunction of high
pressure switch
(HPS)
Malfunction of low
pressure switch
(LPS)
Malfunction of
compressor motor
overload thermistor
Malfunction of
position detection
sensor
Malfunction of
outdoor unit fan
motor signal
Malfunction of
compressor input
(CT) system
Malfunction
of outdoor air
thermistor
Malfunction of
discharge air
thermistor
Malfunction of (hot)
water temperature
thermistor
Malfunction of drain
water level sensor
Alarm in thermal
storage unit or
storage controller
High room
temperature alarm
Malfunction of
thermal storage
tank water level
J
Miswiring of
thermistor
Malfunction of
pressure sensor
Malfunction of
current sensor of
compressor
Malfunction of
discharge pipe
thermistor
Malfunction of low
pressure equivalent
saturated
temperature sensor
system
Malfunction of
suction pipe
thermistor
Malfunction of
heat exchanger
thermistor
Malfunction
of thermistor
(Refrigerant circuit)
Malfunction
of thermistor
(Refrigerant circuit)
Malfunction
of thermistor
(Refrigerant circuit)
Malfunction of high
pressure sensor
Malfunction of low
pressure sensor
Malfunction of oil
pressure sensor or
sub-tank thermistor
Malfunction of
oil level sensor
or heating heat
exchanger
thermistor
Malfunction of
oil temperature
thermistor
Malfunction of
engine room
temperature
sensor or exhaust
temperature
L
Malfunction of
inverter system
Malfunction of
inverter PCB
El.compo. box
temperature rise
Malfunction of
inverter radiation fi n
temperature rise
Inverter
instantaneous
overcurrent (DC
output)
Inverter
instantaneous
overcurrent (AC
output)
Total input
overcurrent
Malfunction of
overcurrent inverter
compressor
Malfunction of
inverter compressor
startup error (Stall
prevention)
Malfunction of
power transistor
Malfunction of
transmission
between control
and inverter PCB
Malfunction of
igniter system
Engine startup error
Malfunction of
generator converter
Engine stop
P
Shortage of
refrigerant amount
(thermal storage
unit)
Power voltage
imbalance or
inverter PCB
Automatic
refrigerant charge
operation stop
Malfunction of
thermistor in switch
box
Malfunction of
radiation fi n
temperature sensor
Malfunction of DC
current sensor
Malfunction of
AC or DC output
current sensor
Malfunction of
total input current
sensor
Heat exchanger
freezing protection
during automatic
refrigerant charging
Automatic
refrigerant
charge operation
completed
Refrigerant cylinder
during automatic
refrigerant charging
Refrigerant cylinder
during automatic
refrigerant charging
Automatic
refrigerant charge
operation nearly
completed
Malfunction of
starter actuation
Refrigerant cylinder
during automatic
refrigerant charging
Improper
combination
between inverter
and fan driver
System
U
Shortage of
refrigerant
Reverse phase,
open phase
Malfunction of
power supply or
instantaneous
power failure
Check operation
not executed or
transmission error
Malfunction of
transmission
between indoor and
outdoor unit
Malfunction of
transmission
between indoor
unit and remote
controller
Malfunction of
transmission
between indoor
units
Malfunction of
transmission
between outdoor
units or outdoor
storage unit
Malfunction of
transmission
between remote
controllers
Malfunction of
transmission (other
system)
Improper
combination of
indoor and outdoor
units
Malfunction
of setting of
centralized control
equipment address
Malfunction of
transmission
between indoor
unit and centralized
control equipment
System is not
set yet
Malfunction of
system
Malfunction of
transmission
(accessory device)
M
Malfunction of
central remote
controller PCB
Malfunction of
transmission
between optional
controllers for
centralized control
Improper
combination of
optional controllers
for centralized
control
Address
duplication,
improper setting
Others
6
External protection
device activated
(Heat reclaim
ventilator)
Malfunction of PCB
Ozone density
abnormal
Contaminated
sensor error
Malfunction
of indoor air
thermistor (Heat
reclaim ventilator)
Malfunction
of outdoor air
thermistor (Heat
reclaim ventilator)
Supply air passage
closed
Exhaust air
passage closed
Malfunction of dust
collection unit (Heat
reclaim ventilator)
Malfunction of
damper system
(Heat reclaim
ventilator)
Replace the
humidify element
Replace the
deodorising catalyst
Simplifi ed
remote controller
malfunction (Heat
reclaim ventilator)
Door switch open
(Heat reclaim
ventilator)
Replace the high
effi cient fi lter
8
Micro-computer
initialization
9
Malfunction of
transmission
(between heat
reclaim ventilator
and fan unit)
