SiBE31-801_C Symptom-based TroubleshootingTroubleshooting 2007 The systemconducts fanoperation but notcooling orheatingoperation.This symptom occursimmediately after turning ONthe power supply.The system is in preparationmode of operation. Wait for a period of approximately10 minutes.The remote controller displays"UNDER CENTRALCONTROL", but the system isswitched to blasting operationwithout conducting cooling orheating operation.While in heat storage operation,the system is switched to blastingoperation even if it is set tocooling or heating operation, andthe remote controller displays"UNDER CENTRAL CONTROL".Normal operation.8 The airflow rateis notreproducedaccording to thesetting.Even pressing the AIRFLOWRATE SET button makes nochanges in the airflow rate.In heating operation, when theroom temperature reaches the setdegree, the outdoor unit will stopwhile the indoor unit is brought tofan LL operation so that no one getscold air.Furthermore, if fan operation modeis selected when other indoor unit isin heating operation, the system willbe brought to fan LL operation.(The fan LL operation is alsoenabled while in oil return mode incooling operation.)Normal operation.9 The airflowdirection is notreproducedaccording to thesetting.The airflow direction is notcorresponding to thatdisplayed on the remotecontroller.The flap does not swing.Automatic control Normal operation.10 A white mistcomes out fromthe system.In cooling operation, theambient humidity is high.(This indoor unit is installed ina place with much oil or dust.)Uneven temperature distributiondue to heavy stain of the inside ofthe indoor unitClean the inside of the indoor unit.Immediately after coolingoperation stopping, theoutdoor air temperature andhumidity are low.Hot gas (refrigerant) flown in theindoor unit results to be vaporfrom the unit.Normal operation.After the completion ofdefrosting operation, the systemis switched to heating operation.Defrosted moisture turns to bevapor and comes out from theunits.Normal operation.11 The systemproducessounds.Immediately after turning ONthe power supply, indoor unitproduces "ringing" sounds.These are operating sounds ofthe electronic expansion valve ofthe indoor unit.Normal operation.This sound becomes low after alapse of approximately oneminute."Hissing" sounds arecontinuously produced while incooling or defrosting operation.These sounds are produced fromgas (refrigerant) flowingrespectively through the indoorand outdoor units.Normal operation."Hissing" sounds are producedimmediately after the startup orstop of the system, or thestartup or stop of defrostingoperation.These sounds are producedwhen the gas (refrigerant) stopsor changes flowing.Normal operation.Faint sounds are continuouslyproduced while in coolingoperation or after stopping theoperation.These sounds are produced fromthe drain discharge device inoperation.Normal operation."Creaking" sounds areproduced while in heatingoperation or after stopping theoperation.These sounds are produced fromresin parts expanding andcontracting with temperaturechanges.Normal operation.Sounds like "trickling" or thelike are produced from indoorunits in the stopped state.On VRV systems, these soundsare produced when other indoorunits in operation. The reason isthat the system runs in order toprevent oil or refrigerant fromdwelling.Normal operation.Pitch of operating soundschanges.The reason is that the compressorchanges the operating frequency. Normal operation.Symptom Supposed Cause Countermeasure
