20
Code
number
Category Content of abnormality Leading cause
01 Indoor unit Tripping of protection device
Failure of fan motor, drain discharge, PCB, relay, oat switch activa-
ted
02 Outdoor unit Tripping of protection device Activation of PSH, locked motor
03
Transmission
Abnormality between indoor (or outdoor) and
outdoor (or indoor)
Incorrect wiring, failure of PCB, tripping of fuse, power supply OFF
04 Abnormality between inverter and control PCB Failure in transmission between PCBs for inverter
06 Voltage drop
Voltage drop by excessively low or high voltage
to outdoor unit
Voltage drop of power supply. Incorrect wiring or insufcient capacity
of power supply wiring
07
Cycle
Decrease in discharge gas superheat Excessive refrigerant charge, expansion valve open lock
08 Increase in discharge gas temperature
Insufcient refrigerant, refrigerant leakage, clogging or expansion
valve close lock
11
Sensor on
indoor unit
Inlet air thermistor
Failure of thermistor, sensor, connection
12 Outlet air thermistor
13 Freeze protection thermistor
14 Gas piping thermistor
19 Tripping of protection device for fan motor Failure of fan motor
20
Sensor on
outdoor unit
Compressor thermistor
Failure of thermistor, sensor, connection22 Outdoor air thermistor
24 Evaporating thermistor
31 Incorrect setting of outdoor and indoor unit Incorrect setting of capacity code
35 Incorrect setting in indoor unit number Duplication of indoor unit number
38 Abnormality of protective circuit in outdoor unit
Failure of indoor unit PCB. Incorrect wiring connection to PCB in
indoor unit.
41
Pressure
Overload cooling
(Possibility of high pressure device activation)
Outdoor unit pipe thermistor temperature is higher than 55ºC and the
compressor top temperature is higher than 95ºC when outdoor unit
protection device is activated
42
Overload heating
(Possibility of high pressure device activation)
Indoor unit freeze protection thermistor temperature is higher than
55ºC and the compressor top temperature is higher than 95ºC when
outdoor unit protection device is activated
47
Activation of low pressure decrease protection
device
Stoppage by excessively decrease of evaporating temperature
(Te < -35ºC) is activated 3 times in one hour, locked motor in heating
operation
48 Protection activation for overload operation Excessive refrigerant. Pipe clogging. Compressor failure
51
Inverter
Abnormality of current sensor for inverter Failure of control PCB
53 Protection activation of transistor module
Inverter PCB abnormality.
Failure of compressor, clogging of heat exchanger
54 Inverter n temperature increase
Abnormal inverter n thermistor.
Clogging of heat exchanger
Abnormal outdoor fan
55 Inverter abnormality Failure of inverter PCB
57 Outdoor fan Fan motor abnormality
Disconnected wire of incorrect wiring between control PCB and
inverter PCB.
Incorrect wiring or fan motor abnormality
b1
Indoor unit
number setting
Incorrect unit number setting Over 64 indoor units setting by number or indoor unit address
EE Compressor Compressor protection alarm Failure of compressor.
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