ESIE09-08 Troubleshooting by Indication on the Remote ControllerTroubleshooting 1913.52 “U0” Low Pressure Drop Due to Refrigerant Shortage orElectronic Expansion Valve FailureRemote ControlDisplayU0ApplicableModelsER*Q 011~016*Method 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
