Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Also see for VRV IV-S Series: Installation manual Engineering data Installation and operation manual Installation and operation manual Installer and user guide

Contents

SiUS331604E Troubleshooting by Error CodeService Diagnosis 1864.34 Inverter Compressor Startup AbnormalityError Code L9ApplicableModelsAll outdoor unitsMethod of ErrorDetectionError is detected by the power transistor currentError DecisionConditionsCompressor overload during activation.SupposedCauses Defective compressor Large pressure difference before starting the compressor Defective PCBTroubleshootingCautionBe sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.NONONOYESYESYESDoes L9 blink afterreconnecting to the power?Whenoperation starts, is the highand low pressure difference greater than0.2 MPa (29.0 psi)?Unbalancedinverter output voltage (±5 Vis normal). After stabilizing the inverter,is the inverter output pressuremeasurable?Disconnect the compressor from theinverter. Use power transistor to checkcodes based on maintenance codes.Nonconforming pressurebalance. Check therefrigerant system.Replace the outdoormain PCB (A1P).Reset and then restartthe unit.Check the compressor according todiagnosis procedure for compressorabnormal noises/vibrations andoperation conditions.