ESIE05-03 Error Codes: Outdoor UnitsPart 3 – Troubleshooting 3–61334513.4 Actuation of Low Pressure Sensor: RZQ71B8V3B (E4)Remote ControllerDisplayE4Method ofMalfunctionDetectionActual value of the low pressure is continuously measured using the low pressure sensor.MalfunctionDecisionConditionsError is generated when the low pressure is dropped under specific pressure.Supposed Causes P Abnormal drop of low pressure (Lower than 0.15MPa)P Defect of low pressure sensorP Defect of outdoor unit PC boardP Stop valve is not opened.Troubleshooting*1: Voltage measurement pointLowpressure at stopdue to malfunction is0.15 MPa.Measurethe voltage (VL)of X64A pin No. (2) - (3)of outdoor PC board (A1P).∗1Is the relationship betweenlow voltage and VLnormal?Is stopvalve opened?Out of gas, refrigerant systemclogging, wiring and piping wrongconnection, stop valve closed,electronic expantion valve fully closemalfunction.Replace the low pressure sensor.Replace outdoor unit PC board A1P.NONOYESYESOpen stop valve.NOYES
