Daikin REYQ8T7Y1B Installation And Operation Manual

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Daikin REYQ8T7Y1B Installation And Operation Manual Manual pdf 39 page image

14 TroubleshootingInstallation and operation manual39REYQ8~20+REMQ5T7Y1BVRV IV system air conditioner4P353996-1E – 2018.04Malfunction MeasureIf the user interface display indicates theunit number, the operation lamp flashesand the malfunction code appears.Notify your installer andreport the malfunctioncode.If the system does NOT properly operate except for the abovementioned cases and none of the above mentioned malfunctions isevident, investigate the system according to the followingprocedures.Malfunction MeasureIf the system does notoperate at all.▪ Check if there is no power failure. Waituntil power is restored. If power failureoccurs during operation, the systemautomatically restarts immediately afterpower is restored.▪ Check if no fuse has blown or breaker isactivated. Change the fuse or reset thebreaker if necessary.If the system goes intofan only operation, butas soon as it goes intoheating or coolingoperation, the systemstops.▪ Check if air inlet or outlet of outdoor orindoor unit is not blocked by obstacles.Remove any obstacles and make surethe air can flow freely.▪ Check if the user interface display shows(time to clean the air filter). (Refer to"13 Maintenance and service" onpage 38 and "Maintenance" in the indoorunit manual.)The system operatesbut cooling or heatingis insufficient.▪ Check if air inlet or outlet of outdoor orindoor unit is not blocked by obstacles.Remove any obstacles and make surethe air can flow freely.▪ Check if the air filter is not clogged (referto "Maintenance" in the indoor unitmanual).▪ Check the temperature setting.▪ Check the fan speed setting on your userinterface.▪ Check for open doors or windows. Closedoors and windows to prevent wind fromcoming in.▪ Check if there are too many occupants inthe room during cooling operation. Checkif the heat source of the room isexcessive.▪ Check if direct sunlight enters the room.Use curtains or blinds.▪ Check if the air flow angle is proper.If after checking all above items, it is impossible to fix the problemyourself, contact your installer and state the symptoms, the completemodel name of the unit (with manufacturing number if possible) andthe installation date (possibly listed on the warranty card).14.1 Error codes: OverviewIn case a malfunction code appears on the indoor unit user interfacedisplay, contact your installer and inform the malfunction code, theunit type, and serial number (you can find this information on thenameplate of the unit).For your reference, a list with malfunction codes is provided. Youcan, depending on the level of the malfunction code, reset the codeby pushing the ON/OFF button. If not, ask your installer for advice.Main code ContentsExternal protection device was activatedMain code ContentsEEPROM failure (indoor)Drain system malfunction (indoor)Fan motor malfunction (indoor)Swing flap motor malfunction (indoor)Expansion valve malfunction (indoor)Drain malfunction (indoor unit)Filter dust chamber malfunction (indoor)Capacity setting malfunction (indoor)Transmission malfunction between main PCB and subPCB (indoor)Heat exchanger thermistor malfunction (indoor; liquid)Heat exchanger thermistor malfunction (indoor; gas)Suction air thermistor malfunction (indoor)Discharge air thermistor malfunction (indoor)Movement detector or floor temperature sensormalfunction (indoor)User interface thermistor malfunction (indoor)PCB malfunction (outdoor)Current leakage detector was activated (outdoor)High pressure switch was activatedLow pressure malfunction (outdoor)Compressor lock detection (outdoor)Fan motor malfunction (outdoor)Electronic expansion valve malfunction (outdoor)Discharge temperature malfunction (outdoor)Abnormal suction temperature (outdoor)Refrigerant overcharge detectionHigh pressure switch malfunctionLow pressure switch malfunctionFan motor trouble (outdoor)Ambient temperature sensor malfunction (outdoor)Pressure sensor malfunctionCurrent sensor malfunctionDischarge temperature sensor malfunction (outdoor)Heat exchanger gas temperature sensor malfunction(outdoor)Suction temperature sensor malfunction (outdoor)De-icing temperature sensor malfunction (outdoor)Liquid temperature sensor (after subcool HE)malfunction (outdoor)Liquid temperature sensor (coil) malfunction (outdoor)Gas temperature sensor (after subcool HE)malfunction (outdoor)High pressure sensor malfunction (S1NPH)Low pressure sensor malfunction (S1NPL)INV PCB abnormalFin temperature abnormalInverter PCB faultyCompressor over current detectedCompressor lock (startup)Transmission outdoor unit - inverter: INV transmissiontroubleINV unbalanced power supply voltageAutocharge operation relatedFin thermistor malfunctionAutocharge operation related