SiUS39-602
iv Table of Contents
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
3.4 “MC” Address Duplication, Improper Setting.......................................... 198
4. Troubleshooting (OP: Schedule Timer) ..............................................199
4.1 “UE” Malfunction of Transmission Between Centralized
Controller and Indoor Unit.................................................................... 199
4.2 “M1” PC Board Defect ............................................................................ 201
4.3 “M8” Malfunction of Transmission Between Optional
Controllers for Centralized Control....................................................... 202
4.4 “MA” Improper Combination of Optional Controllers for
Centralized Control ..............................................................................203
4.5 “MC” Address Duplication, Improper Setting..........................................205
5. Troubleshooting (OP: Unified ON/OFF Controller) .............................206
5.1 Operation Lamp Blinks......................................................................... 206
5.2 Display “Under Centralized Control” Blinks (Repeats Single Blink) .....208
5.3 Display “Under Centralized Control” Blinks (Repeats Double Blink).... 211
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