Troubleshooting by Indication on the Remote Controller Mini UM S/M154 Troubleshooting4.42 “UA” Excessive Number of Indoor UnitsRemoteControllerDisplayUAApplicableModelsAII outdoor unit modelsMethod ofMalfunctionDetectionMalfunctionDecisionConditionsSupposedCauses Excess of connected indoor units Defect of outdoor unit PC board (A1P) Mismatching of the refrigerant type of indoor and outdoor unit. Setting of outdoor P.C. board was not conducted after replacing to spare parts P.C. board.Troubleshooting∗ The number of indoor units that can be connected to a single outdoor unit system depends onthe type of outdoor unit.CautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.(V3169)The totalof indoor unitsdisplaying "UA" andindoor units connected to thesame refrigerant system iswithin connectablenumber ofunit∗NormalNONOThere are too many indoor unitswithin the same refrigerantsystem.Push and hold the RESETbutton on the outdoor unitPC board for 5 seconds.YESIs the outdoorP.C. board replacedto spare parts P.C.board ?YES The refrigerant classification hasnot been set yet.NOYESDoes a malfunction occur?Replace outdoor unit PC board(A1P).Matches the refrigerant type ofindoor and outdoor unit.NOYESDoes therefrigerant type of indoorand outdoor unitmatch?
