Special Functions ....................................................................................................................................................................I-3

Auto Restart ...........................................................................................................................................................................I-3

Forced Defrost .......................................................................................................................................................................I-3

Indoor Temperature Display (Highwall Only) ........................................................................................................................I-3

Enhanced Defrost ..................................................................................................................................................................I-3

Temperature Compensation .................................................................................................................................................I-4

Matching Tables ......................................................................................................................................................................I-6

Resistance Chart / Sensor Definitions .....................................................................................................................................I-7

Resistance Values ...................................................................................................................................................................I-8

Louver Motors ........................................................................................................................................................................I-8

EEV .........................................................................................................................................................................................I-8

Component Ratings ................................................................................................................................................................I-9

4-Way Valve ...........................................................................................................................................................................I-9

Basepan Heater .....................................................................................................................................................................I-9

Fan Motors .............................................................................................................................................................................I-9

Refrigeration Diagrams ........................................................................................................................................................I-10

Master Error Code Chart .......................................................................................................................................................I-12

Outdoor Unit Error Codes .....................................................................................................................................................I-16

Temperature Sensor Error Codes .......................................................................................................................................I-16

Pressure-Related Error Codes ............................................................................................................................................I-17

Communication Error Code ................................................................................................................................................I-17

Error Codes Caused by Abnormal Refrigerant Circuit Conditions ....................................................................................I-18

Outdoor Error Code Related to Indoor Unit .......................................................................................................................I-18

Error Code Related to the PCB ............................................................................................................................................I-18

Error Codes Related to the IPM ...........................................................................................................................................I-18

Flow Charts ...........................................................................................................................................................................I-20

[1] Outdoor EEPROM Malfunction ......................................................................................................................................I-20

[2] Outdoor IPM over current or short circuit ....................................................................................................................I-20

[4] Communication abnormal between PCB and IPM ........................................................................................................I-21

[6] DC voltage or AC voltage high.......................................................................................................................................I-21

[8] Discharge temperature too high protection .................................................................................................................I-22

[9] DC fan motor fault ..........................................................................................................................................................I-22

[10] Outdoor defrosting temp. sensor Te abnormal .........................................................................................................I-23

[11] Suction temp.sensor Ts abnormal...............................................................................................................................I-23

[12] Outdoor ambient temp. sensor Ta abnormal .............................................................................................................I-23

[13] Discharging temp. sensor Td abnormal ......................................................................................................................I-23

[15] Communication abnormal between indoor unit and outdoor unit ............................................................................I-23

[16] Lack of refrigerant or discharging pipe blocked .........................................................................................................I-24

[17] 4-way valve reversing failure .......................................................................................................................................I-24

[18] Compressor motor desynchronizing ..........................................................................................................................I-25

[24] Compressor startup failure .........................................................................................................................................I-25

[25] Input overcurrent of the drive module ........................................................................................................................I-25

[42] Open high pressure switch ..........................................................................................................................................I-26

[43] Open low pressure switch ............................................................................................................................................I-26

[44] High pressure detected in system ..............................................................................................................................I-27

[45] Low pressure detected in system ...............................................................................................................................I-27

TROUBLESHOOTING & REFERENCES

Table of Contents

TROUBLESHOOTING & REFERENCES

I-1

Table of Contents