Daikin VRV IV W+ Series Installer And User Reference Manual

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11 | TroubleshootingInstaller and user reference guide39RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1B – 2020.10In this chapter11.1 Error codes: Overview ............................................................................................................................................................ 3911.2 Symptoms that are NOT system malfunctions ...................................................................................................................... 3911.2.1 Symptom: The system does not operate............................................................................................................... 3911.2.2 Symptom: Cool/Heat cannot be changed over ..................................................................................................... 3911.2.3 Symptom: Fan operation is possible, but cooling and heating do not work ........................................................ 4011.2.4 Symptom: The fan speed does not correspond to the setting ............................................................................. 4011.2.5 Symptom: The fan direction does not correspond to the setting ........................................................................ 4011.2.6 Symptom: White mist comes out of a unit (Indoor unit) ...................................................................................... 4011.2.7 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit) ............................................................... 4011.2.8 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes ................. 4011.2.9 Symptom: Noise of air conditioners (Indoor unit)................................................................................................. 4011.2.10 Symptom: Noise of air conditioners (Indoor unit, outdoor unit).......................................................................... 4111.2.11 Symptom: Noise of air conditioners (Outdoor unit) ............................................................................................. 4111.2.12 Symptom: Dust comes out of the unit................................................................................................................... 4111.2.13 Symptom: The units can give off odours ............................................................................................................... 4111.2.14 Symptom: The outdoor unit fan does not spin ..................................................................................................... 4111.2.15 Symptom: The display shows "88"......................................................................................................................... 4111.2.16 Symptom: The compressor in the outdoor unit does not stop after a short heating operation......................... 4111.2.17 Symptom: The inside of an outdoor unit is warm even when the unit has stopped ........................................... 4211.2.18 Symptom: Hot air can be felt when the indoor unit is stopped............................................................................ 4211.1 Error codes: OverviewIn case a malfunction code appears on the indoor unit user interface display,contact your installer and inform the malfunction code, the unit type, and serialnumber (you can find this information on the nameplate of the unit).For your reference, a list with malfunction codes is provided. You can, dependingon the level of the malfunction code, reset the code by pushing the ON/OFFbutton. If not, ask your installer for advice.11.2 Symptoms that are NOT system malfunctionsThe following symptoms are NOT system malfunctions:11.2.1 Symptom: The system does not operate▪ The air conditioner does not start immediately after the ON/OFF button on theuser interface is pressed. If the operation lamp lights, the system is in normalcondition. To prevent overloading of the compressor motor, the air conditionerstarts 5 minutes after it is turned ON again in case it was turned OFF just before.The same starting delay occurs after the operation mode selector button wasused.▪ If "Under Centralized Control" is displayed on the user interface, pressing theoperation button causes the display to blink for a few seconds. The blinkingdisplay indicates that the user interface cannot be used.▪ The system does not start immediately after the power supply is turned on. Waitone minute until the micro computer is prepared for operation.11.2.2 Symptom: Cool/Heat cannot be changed over▪ When the display shows (change-over under centralized control), it showsthat this is a slave user interface.