SiBE041012_Aiii Table of Contents2. Operation Manual..................................................................................502.1 Name of Parts ........................................................................................502.2 AUTO · DRY · COOL · HEAT · FAN Operation ......................................542.3 Adjusting the Airflow Direction and Rate ................................................562.4 COMFORT AIRFLOW Operation ...........................................................582.5 INTELLIGENT EYE Operation ...............................................................592.6 POWERFUL Operation ..........................................................................612.7 OUTDOOR UNIT QUIET Operation.......................................................622.8 ECONO Operation .................................................................................632.9 OFF TIMER Operation ...........................................................................642.10 ON TIMER Operation .............................................................................652.11 WEEKLY TIMER Operation ...................................................................66Part 6 Service Diagnosis............................................................. 721. Troubleshooting with LED .....................................................................741.1 Indoor Unit..............................................................................................741.2 Outdoor Unit ...........................................................................................742. Problem Symptoms and Measures .......................................................753. Service Check Function ........................................................................764. Troubleshooting ....................................................................................794.1 Error Codes and Description ..................................................................794.2 Indoor Unit PCB Abnormality .................................................................804.3 Freeze-up Protection Control or Heating Peak-cut Control....................824.4 Fan Motor (DC Motor) or Related Abnormality.......................................844.5 Thermistor or Related Abnormality (Indoor Unit)....................................864.6 Front Panel Open / Close Fault..............................................................874.7 Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......884.8 Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............904.9 Outdoor Unit PCB Abnormality...............................................................914.10 OL Activation (Compressor Overload) ...................................................934.11 Compressor Lock ...................................................................................944.12 DC Fan Lock ..........................................................................................954.13 Input Overcurrent Detection ...................................................................964.14 Four Way Valve Abnormality..................................................................974.15 Discharge Pipe Temperature Control.....................................................994.16 High Pressure Control in Cooling .........................................................1004.17 Compressor System Sensor Abnormality ............................................1014.18 Position Sensor Abnormality ................................................................1034.19 DC Voltage / Current Sensor Abnormality (25/35 Class) .....................1064.20 CT or Related Abnormality (50 Class)..................................................1074.21 Thermistor or Related Abnormality (Outdoor Unit)...............................1094.22 Electrical Box Temperature Rise..........................................................1114.23 Radiation Fin Temperature Rise ..........................................................1134.24 Output Overcurrent Detection ..............................................................1154.25 Refrigerant Shortage ............................................................................1174.26 Low-voltage Detection or Over-voltage Detection................................1204.27 Signal Transmission Error on Outdoor Unit PCB (50 Class Only) .......1225. Check ..................................................................................................1235.1 Thermistor Resistance Check ..............................................................1235.2 Fan Motor Connector Check ................................................................1245.3 Power Supply Waveforms Check.........................................................124