Service Manual

SiUS121502E
Table of Contents iv
6. Troubleshooting for FFQ Series..............................................................127
6.1 Indoor Unit PCB Abnormality ................................................................... 127
6.2 Drain Level Control System Abnormality.................................................. 128
6.3 Fan Motor (AC Motor) or Related Abnormality......................................... 129
6.4 Drain System Abnormality........................................................................ 130
6.5 Thermistor or Related Abnormality........................................................... 131
6.6 Remote Controller Thermistor Abnormality .............................................. 132
6.7 Signal Transmission Error
(Between Indoor Unit and Remote Controller) ......................................... 133
6.8 Signal Transmission Error
(Between MAIN Remote Controller and SUB Remote Controller) ........... 134
6.9 Field Setting Abnormality ......................................................................... 135
7. Troubleshooting for Outdoor Unit............................................................136
7.1 Refrigerant Shortage ................................................................................ 136
7.2 Low-voltage Detection or Over-voltage Detection.................................... 138
7.3 Wiring Error Check Unexecuted............................................................... 140
7.4 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) /
Anti-icing Control in Other Rooms............................................................ 141
7.5 Anti-icing Control for Indoor Unit .............................................................. 142
7.6 Outdoor Unit PCB Abnormality................................................................. 144
7.7 OL Activation (Compressor Overload) ..................................................... 145
7.8 Compressor Lock ..................................................................................... 147
7.9 DC Fan Lock ............................................................................................ 148
7.10 Input Overcurrent Detection ..................................................................... 149
7.11 Four Way Valve Abnormality.................................................................... 150
7.12 Discharge Pipe Temperature Control....................................................... 152
7.13 High Pressure Control in Cooling ............................................................. 153
7.14 Compressor Sensor System Abnormality ................................................ 154
7.15 Position Sensor Abnormality .................................................................... 156
7.16 CT or Related Abnormality ....................................................................... 158
7.17 Thermistor or Related Abnormality (Outdoor Unit)................................... 160
7.18 Electrical Box Temperature Rise.............................................................. 162
7.19 Radiation Fin Temperature Rise .............................................................. 163
7.20 Output Overcurrent Detection .................................................................. 164
8. Check ......................................................................................................166
8.1 Thermistor Resistance Check .................................................................. 166
8.2 Indoor Fan Motor Connector Check ......................................................... 167
8.3 Hall IC Check ........................................................................................... 167
8.4 Power Supply Waveform Check............................................................... 168
8.5 Electronic Expansion Valve Check........................................................... 169
8.6 Four Way Valve Performance Check ....................................................... 170
8.7 Inverter Unit Refrigerant System Check................................................... 170
8.8 Inverter Analyzer Check ........................................................................... 171
8.9 Rotation Pulse Check on the Outdoor Unit PCB ...................................... 172
8.10 Installation Condition Check..................................................................... 173
8.11 Discharge Pressure Check....................................................................... 173
8.12 Outdoor Fan System Check ..................................................................... 174
8.13 Main Circuit Short Check.......................................................................... 174
8.14 Capacitor Voltage Check.......................................................................... 175