Haier HSU09VHJ Service Manual

Also see for HSU09VHJ: Installation manual

Contents

HSU09VHJ DB -SM Service DiagnosisDomestic Air Conditioner557..4 The IPM and outdoor PCB don’t communicate or Related Abnormalityoutdoor display LED1 flash 4 times Indoor Display F3Method of Communication is detected by checking the IPM module and the outdoor PCBMalfunctionDetectionMalfunction The outdoor PCB broken leads to communication faultDecision The IPM module broken leads to communication faultConditionsSupposed The outdoor PCB is brokenCauses The IPM module is brokenCommunication wiring disconnectedTroubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, orelse parts damage may be occurred.7..5 Thermistor or Related Abnormality(outdoor unit)Frost-removing temperature sensor failureNONOYESAre they good? 1) Pull out and reinsert the terminals.2) Replace connected wire1) Check whether Terminal CN23 and CN22 on the outdoormainboard CN10 and CN11 on IPM module2) Check whether the connected wire between IPM and outdoorYES Replace the outdoor IPMmodule with a new one.Replace the outdoor mainboard with a new oneElectrify the machine again andturn it on, Check whether thevoltage between 1 and 2 ofTerminal CN22is about DC5V,Check whether the voltagebetween2 and 3 of TerminalCN22 is about DC15VNO