Daikin RWEYQ8T9Y1B Installation And Operation Manual

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

Contents

14 TroubleshootingInstallation and operation manual34RWEYQ8~14T9V1B+RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452190-1A – 2017.04Malfunction 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).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.14.2 Symptoms that are NOT systemmalfunctionsThe following symptoms are NOT system malfunctions:14.2.1 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.14.2.2 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.14.2.3 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.14.2.4 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.14.2.5 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.14.2.6 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.▪ Immediately after the cooling operation stops and if the roomtemperature and humidity are low. This is because warmrefrigerant gas flows back into the indoor unit and generatessteam.14.2.7 Symptom: White mist comes out of a unit(Indoor unit, outdoor unit)When the system is changed over to heating operation after defrostoperation. Moisture generated by defrost becomes steam and isexhausted.14.2.8 Symptom: The user interface displayreads "U4" or "U5" and stops, but thenrestarts after a few minutesThis is because the user interface is intercepting noise from electricappliances other than the air conditioner. The noise preventscommunication between the units, causing them to stop. Operationautomatically restarts when the noise ceases.14.2.9 Symptom: Noise of air conditioners(Indoor unit)▪ A "zeen" sound is heard immediately after the power supply isturned on. The electronic expansion valve inside an indoor unitstarts working and makes the noise. Its volume will reduce inabout one minute.

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