Service manual

SiUS28-902_a
Troubleshooting 66
3.27 “JC” Outdoor Unit: Malfunction of Low Pressure Sensor ......................119
3.28 “L1” Outdoor Unit: Malfunction of P.C.B. ..............................................121
3.29 “L4” Outdoor Unit: Malfunction of
Inverter Radiating Fin Temperature Rise............................................. 122
3.30 “L5” Outdoor Unit: Inverter Compressor Abnormal...............................123
3.31 “L8” Outdoor Unit: Inverter Current Abnormal ...................................... 124
3.32 “L9” Outdoor Unit: Inverter Start up Error .............................................126
3.33 “LC” Outdoor Unit: Malfunction of Transmission between
Inverter and Control P.C.B...................................................................127
3.34 “P4” Outdoor Unit: Malfunction of
Inverter Radiating Fin Temperature Rise Sensor................................. 128
3.35 “U0” Outdoor Unit: Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure .....................................................129
3.36 “U2” Power Supply Insufficient or Instantaneous Failure ......................131
3.37 “U3” Check Operation not Executed ..................................................... 133
3.38 “U4” Malfunction of Transmission between
Indoor Units and Outdoor Units ...........................................................134
3.39 “U5” Malfunction of Transmission between
Remote Controller and Indoor Unit ......................................................136
3.40 “U8” Malfunction of Transmission between
Main and Sub Remote Controllers.......................................................137
3.41 “UE” Malfunction of Transmission between
Centralized Remote Controller and Indoor Unit ...................................138
3.42 “UF” System is not Set yet .................................................................... 140
3.43 “UH” Malfunction of System,
Refrigerant System Address Undefined............................................... 141
4. Troubleshooting by Indication on
the Centralized Remote Controller .............................................143
4.1 “UE” Malfunction of Transmission between
Centralized Remote Controller and Indoor Unit ...................................143
4.2 “M1” P.C.B. Defect ................................................................................ 145
4.3 “M8” Malfunction of Transmission between
Optional Controllers for Centralized Control ........................................146
4.4 “MA” Improper Combination of Optional Controllers for
Centralized Control .............................................................................. 147
4.5 “MC” Address Duplication, Improper Setting .........................................149
5. Troubleshooting by Indication on the Unified ON/OFF Controller.......150
5.1 Operation Lamp Blinks......................................................................... 150
5.2 Display “Under Host Computer Integrate Control” Blinks
(Repeats Single Blink) ......................................................................... 152
5.3 Display “Under Host Computer Integrate Control” Blinks
(Repeats Double Blink) ........................................................................ 155