SiUS39-602iv Table of Contents2.41 “PJ” Outdoor Unit: Faulty Field Setting after Replacing MainPC Board or Faulty Combination of PC Board..................................... 1732.42 “UO” Outdoor Unit: Low Pressure Drop due to RefrigerantShortage or Electronic Expansion Valve Failure.................................. 1742.43 “U1” Outdoor Unit: Reverse Phase, Open Phase .................................. 1752.44 “U2” Outdoor Unit: Power Supply Insufficient orInstantaneous Failure .......................................................................... 1762.45 “U3” Outdoor Unit: Check Operation not Executed ............................... 1782.46 “U4” Malfunction of Transmission between Indoor Units ...................... 1792.47 “U5” Indoor Unit: Malfunction of Transmission betweenRemote Controller and Indoor Unit ...................................................... 1812.48 “U7” Indoor Unit: Malfunction of Transmission betweenOutdoor Units ....................................................................................... 1822.49 “U8” Indoor Unit: Malfunction of Transmission betweenMAIN and SUB Remote Controllers..................................................... 1842.50 “U9” Indoor Units: Malfunction of Transmission betweenIndoor Units and Outdoor Units in the Same System .......................... 1852.51 “UA” Improper Combination of Indoor Units andOutdoor Units/Indoor Units and Remote Controller ............................. 1872.52 “UC” Address Duplication of Centralized Remote Controller ................. 1882.53 “UE” Malfunction of Transmission between Centralized Controllerand Indoor Unit .................................................................................... 1892.54 “UF” System is not Set yet..................................................................... 1912.55 “UH” Malfunction of System,Refrigerant System Address Undefined............................................... 1923. Troubleshooting (OP: Central Remote Controller) ..............................1943.1 “M1” PC Board Defect ............................................................................ 1943.2 “M8” Malfunction of Transmission Between OptionalControllers for Centralized Control....................................................... 1953.3 “MA” Improper Combination of OptionalControllers for Centralized Control....................................................... 1963.4 “MC” Address Duplication, Improper Setting.......................................... 1984. Troubleshooting (OP: Schedule Timer) ..............................................1994.1 “UE” Malfunction of Transmission Between CentralizedController and Indoor Unit .................................................................... 1994.2 “M1” PC Board Defect ............................................................................ 2014.3 “M8” Malfunction of Transmission Between OptionalControllers for Centralized Control....................................................... 2024.4 “MA” Improper Combination of Optional Controllers forCentralized Control .............................................................................. 2034.5 “MC” Address Duplication, Improper Setting.......................................... 2055. Troubleshooting (OP: Unified ON/OFF Controller) .............................2065.1 Operation Lamp Blinks......................................................................... 2065.2 Display “Under Centralized Control” Blinks (Repeats Single Blink) ..... 2085.3 Display “Under Centralized Control” Blinks (Repeats Double Blink).... 211
