Service manual

SiBE05-722_C
iii Table of Contents
3.12 Malfunctions ...........................................................................................50
Part 5 Remote Controller ............................................................ 51
1. FLK(X)S25/35BAVMB...........................................................................52
Part 6 Service Diagnosis............................................................. 54
1. Troubleshooting with LED .....................................................................55
1.1 Indoor Unit..............................................................................................55
1.2 Outdoor Unit ...........................................................................................55
2. Problem Symptoms and Measures .......................................................56
3. Service Check Function ........................................................................57
4. Troubleshooting ....................................................................................60
4.1 Error Codes and Description ..................................................................60
4.2 Indoor Unit PCB Abnormality .................................................................61
4.3 Freeze-up Protection Control or Heating Peak-cut Control....................62
4.4 Fan Motor (AC Motor) or Related Abnormality.......................................63
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................64
4.6 Refrigerant Shortage ..............................................................................65
4.7 Low-voltage Detection or Over-voltage Detection..................................67
4.8 Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......69
4.9 Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............71
4.10 Outdoor Unit PCB Abnormality...............................................................72
4.11 OL Activation (Compressor Overload) ...................................................73
4.12 Compressor Lock ...................................................................................75
4.13 DC Fan Lock ..........................................................................................76
4.14 Input Overcurrent Detection ...................................................................77
4.15 Four Way Valve Abnormality..................................................................78
4.16 Discharge Pipe Temperature Control.....................................................80
4.17 High Pressure Control in Cooling ...........................................................81
4.18 Compressor System Sensor Abnormality ..............................................82
4.19 Position Sensor Abnormality ..................................................................83
4.20 DC Voltage / Current Sensor Abnormality..............................................85
4.21 Thermistor or Related Abnormality (Outdoor Unit).................................86
4.22 Electrical Box Temperature Rise............................................................88
4.23 Radiation Fin Temperature Rise ............................................................91
4.24 Output Overcurrent Detection ................................................................94
5. Check ....................................................................................................96
5.1 Thermistor Resistance Check ................................................................96
5.2 Hall IC Check .........................................................................................97
5.3 Power Supply Waveforms Check...........................................................97
5.4 Electronic Expansion Valve Check.........................................................98
5.5 Four Way Valve Performance Check .....................................................99
5.6 Inverter Units Refrigerant System Check ...............................................99
5.7 Inverter Analyzer Check .......................................................................100
5.8 Rotation Pulse Check on the Outdoor Unit PCB ..................................101
5.9 Installation Condition Check.................................................................103
5.10 Discharge Pressure Check...................................................................103
5.11 Outdoor Fan System Check .................................................................104
5.12 Main Circuit Short Check......................................................................104
5.13 Power Module Check ...........................................................................106