Si34-603 Troubleshooting by Indication on the Remote ControllerTroubleshooting 1733.38 “UO” Outdoor Unit: Low Pressure Drop Due to RefrigerantShortage or Electronic Expansion Valve FailureRemoteControllerDisplayU0ApplicableModelsRX(Y)MQ4~6PMethod ofMalfunctionDetectionShort of gas malfunction is detected by discharge pipe temperature thermistor and low pressuresaturation temperature.MalfunctionDecisionConditionsMicrocomputer judge and detect if the system is short of refrigerant.+Malfunction is not decided while the unit operation is continued.SupposedCauses Out of gas or refrigerant system clogging (incorrect piping) Defect of pressure sensor Defect of outdoor unit PC board (A1P) Defect of thermistor R3T
