| 01 | Activation of Protection Device (Float Switch). Activation of Float Switch. |
| 02 | Activation of Protection Device (High Pressure Cut). Activation of PSH. |
| 03 | Abnormality between Indoor and Outdoor. Incorrect Wiring, Loose Terminals, Disconnect Wire, Blowout of Fuse, Outdoor Unit Power OFF. |
| 04 | Abnormality between Inverter PCB and Outdoor PCB. Inverter PCB – Outdoor PCB Transmission Failure. |
| 04. | Abnormality between Fan Controller and Outdoor PCB. Fan Controller – Outdoor PCB Transmission Failure. |
| 05 | Abnormality Power Source Phases. Incorrect Power Source, Connection to Reversed Phase, Open-Phase. |
| 06 | Abnormal Inverter Voltage. Outdoor Voltage Drop, Insufficient Power Capacity. |
| 06. | Abnormal Fan Controller Voltage. Outdoor Voltage Drop, Insufficient Power Capacity. |
| 07 | Decrease in Discharge Gas Superheat. Excessive Refrigerant Charge, Failure of Thermistor, Incorrect Wiring, Incorrect Piping Connection, Expansion Valve Locking at Opened Position (Disconnect Connector). |
| 08 | Increase in Discharge Gas Temperature. Insufficient Refrigerant Charge, Pipe Clogging, Failure of Thermistor, Incorrect Wiring, Incorrect Piping Connection, Expansion Valve Locking at Closed Position (Disconnect Connector). |
| 0A | Abnormality between Outdoor and Outdoor. Incorrect Wiring, Breaking Wire, Loose Terminals. |
| 0b | Incorrect Outdoor Unit Address Setting. Duplication of Address Setting for Outdoor Units (Sub Units) in Same Refrigerant Cycle System. |
| 0C | Incorrect Outdoor Unit Main Unit Setting. Two (or more) Outdoor Units Set as “Main Unit” Exist in Same Refrigerant Cycle System. |
| 11 | Inlet Air Thermistor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 12 | Outlet Air Thermistor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 13 | Freeze Protection Thermistor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 14 | Gas Piping Thermistor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 19 | Activation of Protection Device for Indoor Fan. Fan Motor Overheat, Locking. |
| 21 | High Pressure Sensor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 22 | Outdoor Air Thermistor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 23 | Discharge Gas Thermistor on Top of Compressor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 24 | Heat Exchanger Liquid Pipe Thermistor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 25 | Heat Exchanger Gas Pipe Thermistor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 29 | Low Pressure Sensor. Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit. |
| 31 | Incorrect Capacity Setting of Outdoor Unit and Indoor Unit. Incorrect Capacity Code Setting of Combination Excessive or Insufficient Indoor Unit Total Capacity Code. |
| 35 | Incorrect Setting of Indoor Unit No. Duplication of Indoor Unit No. in same Ref. Gr. |
| 36 | Incorrect of Indoor Unit Combination. Indoor Unit is Designed for R22. |
| 38 | Abnormality of Picking up Circuit for Protection in Outdoor Unit. Failure of Protection Detecting Device (Incorrect Wiring of Outdoor PCB) |
| 39 | Abnormality Running Current at Constant Speed Compressor. Overcurrent, Blowout Fuse, Current Sensor Failure, Instantaneous Power Failure, Voltage Drop, Abnormal Power Supply. |
| 3A | Abnormality of Outdoor Unit Capacity. Outdoor Unit Capacity > 1350KBtu/h. |
| 3b | Incorrect Setting of Outdoor Unit Models Combination or Voltage. Incorrect Setting of Main and Sub Unit(s) Combination or Voltage. |
| 3d | Abnormality Transmission between Main Unit and Sub Unit(s). Incorrect Wiring, Disconnect Wire, Breaking Wire, PCB Failure. |
| 43 | Activation of Low Pressure Decrease Protection Device. Defective Compression (Failure of Compressor of Inverter, Loose Power Supply Connection). |
| 44 | Activation of Low Pressure Increase Protection Device. Overload at Cooling, High Temperature at Heating, Expansion Valve Locking (Loose Connector). |
| 45 | Activation of High Pressure Increase Protection Device. Overload Operation (Clogging, Short-Pass), Pipe Clogging, Excessive Refrigerant, Inert Gas Mixing. |
| 47 | Activation of Low Pressure Decrease Protection Device (Vacuum Operation Protection). Insufficient Refrigerant, Refrigerant Piping, Clogging, Expansion Valve Locking at Open Position (Loose Connector). |
| 48 | Activation of Inverter Overcurrent Protection Device. Overload Operation, Compressor Failure. |
| 51 | Abnormal Inverter Current Sensor. Current Sensor Failure. |
| 53 | Inverter Error Signal Detection. Driver IC Error Signal Detection (Protection for Overcurrent, Low Voltage, Short Circuit). |
| 54 | Abnormality of Inverter Fin Temperature. Abnormal Inverter Fin Thermistor, Heat Exchanger Clogging, Fan Motor Failure. |
| 55 | Inverter Failure. Inverter PCB Failure. |
| 57 | Activation of Fan Controller Protection. Driver IC Error Signal Detection (Protection for Overcurrent, Low Voltage, Short Circuit), Instantaneous Overcurrent. |
| 5A | Abnormality of Fan Controller Fin Temperature. Fin Thermistor Failure, Heat Exchanger Clogging, Fan Motor Failure. |
| 5b | Activation of Overcurrent Protection. Fan Motor Failure. |
| 5c | Abnormality of Fan Controller Sensor. Failure of Current Sensor (Instantaneous Overcurrent, Increase of Fin Temperature, Low Voltage, Earth Fault, Step-Out). |
| EE | Compressor Protection Alarm (It is can not be reset from remote Controller). This alarm code appears when the following alarms* occurs three times within 6 hours. *02, 07, 08, 39, 43 to 45, 47. |
| b1 | Incorrect Outdoor Unit Address Number or Unit Number Setting. Over 64 Number is Set for Address or Refrigerant Cycle. |
| b5 | Incorrect Indoor Unit Connection Number Setting. More than 17 Non-Corresponding to Hi-NET II Units are Connected to One System. |