
Si38-606
104 Troubleshooting
2.31 “L4” Outdoor Unit: Malfunction of Inverter Radiating Fin
Temperature Rise.................................................................................153
2.32 “L5” Outdoor Unit: Inverter Compressor Abnormal ...............................154
2.33 “L8” Outdoor Unit: Inverter Current Abnormal.......................................155
2.34 “L9” Outdoor Unit: Inverter Start up Error..............................................156
2.35 “LC” Outdoor Unit: Malfunction of Transmission between Inverter
and Control PC Board ..........................................................................157
2.36 “P1” Outdoor Unit: Inverter Over-Ripple Protection ...............................159
2.37 “P4” Outdoor Unit: Malfunction of Inverter Radiating Fin
Temperature Rise Sensor ....................................................................160
2.38 “PJ” Outdoor Unit: Faulty Field Setting after Replacing Main
PC Board or Faulty Combination of PC Board .....................................161
2.39 “UO” Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure......................................................162
2.40 “U1” Reverse Phase, Open Phase.........................................................163
2.41 “U2” Power Supply Insufficient or Instantaneous Failure ......................164
2.42 “U3” Check Operation not Executed......................................................166
2.43 “U4” Malfunction of Transmission between Indoor Units.......................167
2.44 “U5” Malfunction of Transmission between Remote Controller
and Indoor Unit.....................................................................................169
2.45 “U7” Malfunction of Transmission between Outdoor Units ....................170
2.46 “U8” Malfunction of Transmission between MAIN and
SUB Remote Controllers ......................................................................172
2.47 “U9” Malfunction of Transmission between Indoor and
Outdoor Units in the Same System ......................................................173
2.48 “UA” Excessive Number of Indoor Units ................................................175
2.49 “UC” Address Duplication of Centralized Remote Controller .................176
2.50 “UE” Malfunction of Transmission between Centralized Remote
Controller and Indoor Unit ....................................................................177
2.51 “UF” Refrigerant System not Set, Incompatible Wiring/Piping ...............179
2.52 “UH” Malfunction of System, Refrigerant System Address Undefined...180
3. Troubleshooting (OP: Central Remote Controller) ..............................181
3.1 “M1” PC Board Defect ............................................................................181
3.2 “M8” Malfunction of Transmission between Optional Controllers for
Centralized Control...............................................................................182
3.3 “MA” Improper Combination of Optional Controllers for
Centralized Control...............................................................................183
3.4 “MC” Address Duplication, Improper Setting ..........................................185
4. Troubleshooting (OP: Schedule Timer)...............................................186
4.1 “UE” Malfunction of Transmission between Central Remote Controller
and Indoor Unit.....................................................................................186
4.2 “M1” PC Board Defect ............................................................................188
4.3 “M8” Malfunction of Transmission between Optional Controllers for
Centralized Control...............................................................................189
4.4 “MA” Improper Combination of Optional Controllers for
Centralized Control...............................................................................190
4.5 “MC” Address Duplication, Improper Setting ..........................................192
5. Troubleshooting (OP: Unified ON/OFF Controller) .............................193
5.1 Operation Lamp Blinks .........................................................................193
5.2 Display “Under Centralized Control” Blinks (Repeats Single Blink) .....195
5.3 Display “Under Centralized Control” Blinks (Repeats Double Blink) ....198
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