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• When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.Indoor unit does not operate.• When OPERATION INDICATOR lamp flashes ON and OFF every 0.5-seconds.Outdoor unit does not operate.DHow to check mis-wiring and serial signal errorTurn OFF the power supply.Is there rated voltage inthe power supply?NoCheck the powersupply.YesTurn ON the power supply.Is there rated voltage betweenoutdoor terminal block S1 andS2?NoCheck the wiring.YesPress EMERGENCY OPERATION switch once.Does the upper lamp of OPERATIONINDICATOR lamp light up?NoYesIs serial signal error indicated 6 minutes later?YesNoIs there any mis-wiring,poor contact, or wiredisconnection of theindoor/outdoorconnecting wire?NoYesCorrect them.AA· Turn OFF inverter-controlled lightingequipment.· Turn OFF the power supply and thenturn ON again.· Press EMERGENCY OPERATIONswitch.Is serial signalerror indicated6 minutes later?BYesNo· Reinstalleither theunit or thelight eachother away.· Attach a filteron remotecontrolreceivingsection ofthe indoorunit.BTurn OFF the power supply.Check once more if the indoor/outdoorconnecting wire is not mis-wiring.Short-circuit outdoor terminal block S2 andS3.W1Turn ON the power supply.Does the LED on the inverter P.C. boardor the outdoor electronic control P.C. boardrepeat "3.6-second-OFF and 0.8-second-ONquick blinking"? W3YesTurn OFF the power supply.Remove the short-circuit betweenoutdoor terminal block S2 and S3.Turn ON the power supply.Is there amplitude of 10 to 20V DCbetween indoor terminal block S2and S3? Is there rated voltage betweenindoor terminal block S1 and S2?YesNoIs there 2V DC or less between CN10A3(+)and JPG(GND)(–) on the indoor electroniccontrol P.C. board?YesNoIs there 2V DC or less betweenCN10A4(+) and JPG(GND)(–)on the indoor electronic controlP.C. board?No YesReplace the indoor power /terminal P.C. board.W1. Mis-wiring may damage indoor P.C. board during theoperation.Be sure to confirm the wiring is correct before theoperation starts.W3. Be sure to check this within 3 minutes after turning ON.After 3 minutes, LED blinks 6 times. Even whenthe inverter P.C.board or the outdoor electronic controlP.C.board is normal, LED blinks 6 times after 3 minutes.(Except for outdoor unit of multi system type)No(Lighted ornot lighted)Replace the inverter P.C. board orthe outdoor electronic control P.C.board.W2W2 Be careful to the residualvoltage of smoothing capacitor.Is there any error of theindoor/outdoor connecting wire,such as the damage of the wire,intermediate connection, poorcontact to the terminal block?Be sure to release the failure-mode recall function after checking.NoReplace the indoorelectronic control P.C. board.YesIs there 2V DC or less betweenCN10A4(+) and JPG(GND)(–)on the indoor electronic controlP.C. board?NoReplace theindoor/outdoorconnecting wire.Yes22
When All lamps flash ON and OFF every 0.5-second.Indoor unit and outdoor unit do not operate.ECheck of installation of the horizontal vaneTurn OFF thepower supply.Is the stopper of the horizontal vanelocked to the indoor unit correctly?YesNoRelock the stopper of thehorizontal vane to the indoor unit.(Refer to 10-1.5.)Turn ON thepower supply.Are all lamps flashing?YesNoOKTo check the continuity of the interlock switch(Fan), measure the resistance of connector 1 - 2connected to CN1R1 on the indoorelectronic control P.C. board.Turn OFF thepower supply.Is there resistance 0 "?YesNo(∞)Replace theinterlock switch(Fan).Replace theindoor electroniccontrol P.C. board.23
Page 1 and 2: SPLIT-TYPE, HEAT PUMP AIR CONDITION
Page 3 and 4: MSZ-GC22VAMSZ-GC25VAMSZ-GC35VAACCES
Page 5 and 6: 5OUTLINES AND DIMENSIONSMSZ-GC22VAM
Page 7 and 8: 8SERVICE FUNCTIONSMSZ-GC22VAMSZ-GC2
Page 9 and 10: 9MICROPROCESSOR CONTROLMSZ-GC22VAMS
Page 11 and 12: NOTE 2FOR MULTI SYSTEM AIR CONDITIO
Page 13 and 14: 2. To release the timerTo release O
Page 15 and 16: 10-2. Failure mode recall functionO
Page 17 and 18: 10-3. Instruction of troubleshootin
Page 19 and 20: OPERATION INDICATORNo.1Abnormalpoin
Page 21: The unit does not operate with the
Page 25 and 26: 10-7. Test point diagram and voltag
Page 27 and 28: OPERATING PROCEDURE2. Removing the

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