SiUS39-602
112 Troubleshooting
2.27 “J5” Outdoor Unit: Malfunction of Thermistor (R2T) for
Suction Pipe ......................................................................................... 158
2.28 “J6” Outdoor Unit: Malfunction of Thermistor (R4T) for
Outdoor Unit Heat Exchanger.............................................................. 159
2.29 “J7” Malfunction of Receiver Outlet Liquid Pipe Thermistor (R6T) .......160
2.30 “J8” Malfunction of Oil Equalizing Pipe Thermistor (R7T) ....................161
2.31 “J9” Malfunction of Sub-cooling Heat Exchanger Gas Pipe Thermistor
(R5T).................................................................................................... 162
2.32 “JA” Outdoor Unit: Malfunction of Discharge Pipe Pressure Sensor .... 163
2.33 “JC” Outdoor Unit: Malfunction of Suction Pipe Pressure Sensor.........164
2.34 “L4” Outdoor Unit: Malfunction of Inverter Radiating Fin
Temperature Rise ................................................................................165
2.35 “L5” Outdoor Unit: Inverter Compressor Abnormal ............................... 166
2.36 “L8” Outdoor Unit: Inverter Current Abnormal....................................... 167
2.37 “L9” Outdoor Unit: Inverter Start up Error ............................................. 168
2.38 “LC” Outdoor Unit: Malfunction of Transmission between Inverter
and Control PC Board.......................................................................... 169
2.39 “P1” Outdoor Unit: Inverter Over-Ripple Protection ...............................171
2.40 “P4” Outdoor Unit: Malfunction of Inverter Radiating Fin
Temperature Rise Sensor.................................................................... 172
2.41 “PJ” Outdoor Unit: Faulty Field Setting after Replacing Main PC Board
or Faulty Combination of PC Board ..................................................... 173
2.42 “UO” Outdoor Unit: Low Pressure Drop due to Refrigerant Shortage or
Electronic Expansion Valve Failure .....................................................174
2.43 “U1” Outdoor Unit: Reverse Phase, Open Phase .................................. 175
2.44 “U2” Outdoor Unit: Power Supply Insufficient or
Instantaneous Failure ..........................................................................176
2.45 “U3” Outdoor Unit: Check Operation not Executed............................... 178
2.46 “U4” Malfunction of Transmission between Indoor Units ...................... 179
2.47 “U5” Indoor Unit: Malfunction of Transmission between
Remote Controller and Indoor Unit ...................................................... 181
2.48 “U7” Indoor Unit: Malfunction of Transmission between
Outdoor Units.......................................................................................182
2.49 “U8” Indoor Unit: Malfunction of Transmission between
MAIN and SUB Remote Controllers..................................................... 184
2.50 “U9” Indoor Units: Malfunction of Transmission between
Indoor Units and Outdoor Units in the Same System ..........................185
2.51 “UA” Improper Combination of Indoor Units and
Outdoor Units/Indoor Units and Remote Controller ............................. 187
2.52 “UC” Address Duplication of Centralized Remote Controller .................188
2.53 “UE” Malfunction of Transmission between Centralized Controller and
Indoor Unit ........................................................................................... 189
2.54 “UF” System is not Set yet.....................................................................191
2.55 “UH” Malfunction of System,
Refrigerant System Address Undefined............................................... 192
3. Troubleshooting (OP: Central Remote Controller)..............................194
3.1 “M1” PC Board Defect ............................................................................ 194
3.2 “M8” Malfunction of Transmission Between Optional Controllers for
Centralized Control ..............................................................................195
3.3 “MA” Improper Combination of Optional Controllers for
Centralized Control ..............................................................................196
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