Daikin VRV IV W+ Series Installation And Operation Manual

Also see for RWEYQ10T9Y1B: Installer and user guide Installation and operation manual Installer and user reference guide

8 TroubleshootingInstallation and operation manual12RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452190-1D – 2020.10When asking your dealer for an intervention, always state:▪ The complete model name of the unit.▪ The manufacturing number (stated on the nameplate of the unit).▪ The installation date.▪ The symptoms or malfunction, and details of the defect.WARNING▪ Do NOT modify, disassemble, remove, reinstall orrepair the unit yourself as incorrect dismantling orinstallation may cause an electric shock or fire. Contactyour dealer.▪ In case of accidental refrigerant leaks, make sure thereare no naked flames. The refrigerant itself is entirelysafe, non-toxic and non-combustible, but it willgenerate toxic gas when it accidentally leaks into aroom where combustible air from fan heaters, gascookers, etc. is present. Always have qualified servicepersonnel confirm that the point of leakage has beenrepaired or corrected before resuming operation.8 TroubleshootingIf one of the following malfunctions occur, take the measures shownbelow and contact your dealer.WARNINGStop operation and shut off the power if anythingunusual occurs (burning smells etc.).Leaving the unit running under such circumstances maycause breakage, electric shock or fire. Contact your dealer.The system MUST be repaired by a qualified service person.If the system does NOT operate properly except for the abovementioned cases and none of the above mentioned malfunctions isevident, investigate the system in accordance with 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"7 Maintenance and service" [4 11] and"Maintenance" in the indoor unit manual.)Malfunction MeasureThe 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).8.1 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.8.2 Symptoms that are NOT systemmalfunctionsThe following symptoms are NOT system malfunctions:8.2.1 Symptom: The system does not operate▪ The air conditioner does not start immediately after the ON/OFFbutton on the user interface is pressed. If the operation lamplights, the system is in normal condition. To prevent overloading ofthe compressor motor, the air conditioner starts 5 minutes after itis turned ON again in case it was turned OFF just before. Thesame starting delay occurs after the operation mode selectorbutton was used.▪ If "Under Centralized Control" is displayed on the user interface,pressing the operation button causes the display to blink for a fewseconds. The blinking display indicates that the user interfacecannot be used.▪ The system does not start immediately after the power supply isturned on. Wait one minute until the micro computer is preparedfor operation.8.2.2 Symptom: Cool/Heat cannot be changedover▪ When the display shows (change-over under centralizedcontrol), it shows that this is a slave user interface.