Error Codes: Outdoor Units ESIE05-033–74 Part 3 – Troubleshooting313453.11 Abnormal Low Pressure Switch (H4)Applicable model RZQ100~140Remote ControllerDisplayH4Method ofMalfunctionDetectionP Check the continuity of LPSP LPS is not operated when the low pressure is dropped under specific pressure (0.12MPa).MalfunctionDecisionConditionsWhen there is no continuity in the LPS during compressor start operating.LPS is not operated when the low pressure is dropped under specific pressure (0.12MPa) duringcompressor operating.Supposed Causes P Faulty LPSP Disconnection in LPS harnessP Faulty connection of LPS connectorP Defect of outdoor unit PC boardP Refrigerant shortageP Stop valve is not openedP Defective expansion valveP Clogged check valve
