Daikin FFA50A2VEB9 Installer And User Reference Manual

17 TroubleshootingInstaller and user reference guide29FFA25~60A2VEB(9)Split system air conditioners4P550955-4 – 2018.08WARNINGStop 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.Malfunction MeasureIf a safety device such as a fuse, abreaker or an earth leakage breakerfrequently actuates or the ON/OFFswitch does NOT properly work.Turn OFF the main powerswitch.If water leaks from the unit. Stop the operation.The operation switch does NOT workwell.Turn OFF the powersupply.If 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.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 (see"16.1.1 To clean the air filter" onpage 26).▪ 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).17.1 Symptoms that are NOT systemmalfunctionsThe following symptoms are NOT system malfunctions:17.1.1 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.17.1.2 Symptom: The fan speed does notcorrespond to the settingThe fan speed does not change even if the fan speed adjustmentbutton in 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 if the button is pressed.17.1.3 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.17.1.4 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.17.1.5 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.17.1.6 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.17.1.7 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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