Si04-115Table of Contents iii2. Problem Symptoms and Measures .......................................................633. Service Check Function ........................................................................643.1 ARC423 Series.......................................................................................644. Code Indication on The Remote Controller...........................................654.1 Error Codes and Description of Fault .....................................................655. Trouble shooting ...................................................................................665.1 Faulty PCB .............................................................................................665.2 Operation Shutdown Due to High-Pressure Control orFreeze-Up Protection (Thermistor Activation) ........................................675.3 Operation Halt Due to Fan Motor (AC Motor) or Related Abnormality. ..685.4 Operation Halt Due to Detection of Thermistor orRelated Abnormality ...............................................................................695.5 Faulty Indoor Unit PCB...........................................................................705.6 Faulty Indoor Unit PCB...........................................................................715.7 Power Supply Abnormalities or Faulty Indoor Printed Circuit Boards ....725.8Signal Transmission Error (Between Indoor and Outdoor Units) ...........735.9 Operation Halt Due to Detection of CT Error..........................................745.10 Operation Halt Due to Thermistor Error or Disconnection Detection .....755.11 Operation Halt Due to Compressor Startup Error ..................................765.12 Output Overcurrent.................................................................................775.13 Faulty Outdoor Unit PCB........................................................................795.14 Faulty Outdoor Unit PCB and Transmitting/Receiving Circuit ................805.15 Operation Halt Due to Detection of Input Over Current..........................815.16 Interrupt due to OL Action ......................................................................836. Check ....................................................................................................856.1 How to Check .........................................................................................85Part 7 Removal Procedure .......................................................... 931. For FTK25J, FTK35J, FTX25J, FTX35J ...............................................941.1 Removal of Air Filter...............................................................................941.2 Removal of Front Grille ..........................................................................971.3 Removal of Horizontal Blade and Vertical Blade..................................1001.4 Removal of Switch Box, PC Board and Swing Motor...........................1021.5 Removal of Heat Exchanger ................................................................1081.6 Install of Drain Plug ..............................................................................1111.7 Removal of Fan Rotor and Motor .........................................................1122. For RK25J, RK35J, RX25J, RX35J.....................................................1162.1 Removal of External Casing.................................................................1162.2 Removal of Bell mouth and Left Side Plate..........................................1192.3 Removal of PC Board and Switch Box.................................................1202.4 Removal of Propeller Fan and Fan Motor ............................................1262.5 Removal of Compressor Noise Absorption Pad...................................1282.6 Removal of Partition Plate and Reactor. ..............................................1302.7 Removal of Four-way Valve. ................................................................1322.8Removal of Compressor.......................................................................134Part 8 Others ............................................................................. 1371. Others .................................................................................................1381.1 Explanation...........................................................................................138