Daikin RWEYQ8T9Y1B Installer And User Manual

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

19 TroubleshootingInstaller and user reference guide53RWEYQ8~14T9V1B + RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1 – 2017.04WARNINGStop 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 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"18 Maintenance and service" onpage 51 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).19.1 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.19.2 Symptoms that are NOT systemmalfunctionsThe following symptoms are NOT system malfunctions:19.2.1 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.19.2.2 Symptom: Cool/Heat cannot be changedover▪ When the display shows (change-over under centralizedcontrol), it shows that this is a slave user interface.▪ When the cool/heat changeover remote control switch is installedand the display shows (change-over under centralizedcontrol), this is because cool/heat changeover is controlled by thecool/ heat changeover remote control switch. Ask your dealerwhere the remote control switch is installed.19.2.3 Symptom: Fan operation is possible, butcooling and heating do not workImmediately after the power is turned on. The micro computer isgetting ready to operate and is performing a communication checkwith all indoor units. Please wait 12 minutes maximally until thisprocess is finished.19.2.4 Symptom: The fan strength does notcorrespond to the settingThe fan speed does not change even if the fan speed adjustmentbutton is pressed. During heating operation, when the roomtemperature reaches the set temperature, the outdoor unit goes offand the indoor unit changes to whisper fan speed. This is to preventcold air blowing directly on occupants of the room. The fan speedwill not change even when another indoor unit is in heatingoperation, if the button is pressed.19.2.5 Symptom: The fan direction does notcorrespond to the settingThe fan direction does not correspond with the user interfacedisplay. The fan direction does not swing. This is because the unit isbeing controlled by the micro computer.19.2.6 Symptom: White mist comes out of a unit(Indoor unit)▪ When humidity is high during cooling operation. If the interior of anindoor unit is extremely contaminated, the temperature distributioninside a room becomes uneven. It is necessary to clean theinterior of the indoor unit. Ask your dealer for details on cleaningthe unit. This operation requires a qualified service person.

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