Haier 1U50KEFFRA-1 Service Manual

Also see for 1U50KEFFRA-1: Service manual Instruction manual Installation manual Installation manual

Service Diagnosis4110.4.7 The communication fault between IPM and outdoor PCBOutdoor display: F3 LED1 flash 4 timesCommunication is detected by checking the IPM module and the outdoor PCB■ The outdoor PCB broken leads to communication fault■ The IPM module broken leads to communication fault■ The outdoor PCB is broken■ The IPM module is broken■ Communication wiring disconnected* Caution: Be sure to turn off power switch before connect or disconnect connector,or else parts damage may be occurred.Method ofMalfunctionDetectionTroubleshootingSupposedCausesMalfunctionDecisionConditionsAre they good? Pull out and reinsert the terminals.Replace connected wireReplace the outdoor PCB with a newoneReplace the outdoor IPMmodule with a new one.Check whether the CN23 and CN24terminals of the outdoor PCB and theCN10 and CN11 terminals of the IPMmodule are tightly connected.Check whether the connection betweenthe power module and the outdoor P&Nline is tightElectrify the machine again and turn it on.Check whether the voltage between 1 and 2of Terminal CN23 is about DC5V.Check whether the voltage between2 and 3of terminal CN23 is about DC15V.NOYESMalfunction unsolvedNO1 2 3