1-23
TROUBLESHOOTING
COOL
Indoor Unit
Number
Alarm Code
Indicated
for a second
alternately
MED
A/C
ADDS. RN
ALARM
COOL
Connected No.
of Indoor Units
Alarm CodeModel Code
MED
A/C
ALARM
1.2 Troubleshooting Procedure
Alarm Code Indication of Remote Control Switch
1.2.1 Alarm Code Table
Code No. Category Content of Abnormality Leading Cause
01 Indoor Unit Tripping of Protection Device Failure of Fan Motor, Drain Discharge, PCB, Relay
02 Outdoor Unit Tripping of Protection Device Activation of PSH
03 Transmission
Abnormality between Indoor (or outdoor) and
Outdoor (or Indoor)
Incorrect Wiring. Failure of PCB.
Tripping of Fuse. Power Supply OFF.
04 Inverter Abnormality between Inverter and Control PCB Failure in Transmission between PCBs
05 Transmission Abnormality of Power Source Wiring Reverse Phase Incorrect Wiring
06 Voltage Drop
Voltage Drop by Excessively Low or High
Voltage to Outdoor Unit
Voltage Drop of Power Supply, Incorrect Wiring or
Insufficient Capacity of Power Supply Wiring
07 Decrease in Discharge Gas Superheat
Excessive Refrigerant Charge, Expansion Valve
Open Lock
08 Increase in Discharge Gas Temperature
Insufficient Refrigerant. Ref. Leakage, Clogging or
Expansion Valve Close Lock
09 Outdoor Unit Tripping of Protection Device Failure of Fan Motor
11 Inlet Air Thermistor
12 Outlet Air Thermistor
13 Freeze Protection Thermistor
14 Gas Piping Thermistor
19 Tripping of Protection Device for Fan Motor Failure of Fan Motor
21 High Pressure Sensor
22 Outdoor Air Thermistor
23 Discharge Gas Thermistor on Comp.
24 Evaporating Thermistor
29 Low Pressure Sensor
30 * Incorrect Wiring Connection
Incorrect Wiring Connection between Outdoor Unit,
CH Unit and Indoor Unit
31 Incorrect Setting of Outdoor and Indoor Unit Incorrect Setting of Capacity Code.
32 Abnormal Transmission of Other Indoor Unit
Failure of Power Supply, PCB in Other Indoor Unit.
Failure of Other Indoor Unit of the Same
Refrigerant Cycle.
35 Incorrect Setting in Indoor/Outdoor Unit No.
Existence of the same Indoor Unit No. in the same
refrigerant cycle.
38
Abnormality of Protective Circuit in
Outdoor Unit
Failure of Indoor Unit PCB. Incorrect Wiring
Connection to PCB in Outdoor Unit
39
Abnormality of Running Current at
Constant Compressor
Overcurrent, Melted Fuse of Failure of Current
Sensor
43 Pressure Ratio Decrease Protection Activating Failure of Compressor, Inverter
44 Low Pressure Increase Protection Activating
Overload to Indoor in Cooling, High Temperature of
Outdoor Air in Heating Expansion Valve Open Lock
45 High Pressure Increase Protection Activating
Overload Operation. Excessive Refrigerant
Clogging of Heat Exchanger
46 High Pressure Decrease Protection Activating Insufficient Refrigerant
47 Low Pressure Decrease Protection Activating
Insufficient Refrigerant. Expansion Valve Close
Lock. Refrigerant Leakage.
51 Abnormality of Current Sensor for Inverter Failure of Sensor on Inverter PCB
52 Overcurrent Protection Activating Overload, Overcurrent, Locked to Compressor
53 IPM Protection Activating
Automatic Stoppage of IPM (Overcurrent, Low
Voltage or Overheating)
54 ** Increase in Inverter Fin Temperature
Abnormal Inverter Fin Thermistor,
Abnormal Outdoor Fan
56 ** Abnormality of Detection for Fan Motor Position Abnormal Detection Circuit of Transmission
57 ** Fan Controller Protection Activating Abnormal Fan Speed
58 ** Abnormality of Fan Controller Overcurrent, Abnormal Fan Controller Fin
59 AC Chopper AC Chopper Circuit Protection Failure of FET, Power Supply, CT for Fan Motor
EE Compressor Compressor Protection
3 Time Occurrence of Alarm Giving Damage to
Compressor within 6 hours
dd *** Transmission Incorrect Wiring between Indoor Units
Incorrect Wiring between Indoor Units and Remote
Control Switch
* : For only FXG and FX3 series. Other code Nos. are common with FSG and FS3 series.
** : For only 24, 30FSG1/FSG5 (220V 60Hz), *** : In case of PC-2H2
Failure of Thermistor, Sensor, Connection
Cycle
Sensor on
Indoor Unit
Sensor on
Outdoor Unit
Failure of Thermistor, Sensor, Connection
Outdoor Fan
Inverter
Pressure
System
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