Daikin VRV IV Q+ Series Installer And User Reference Manual

Also see for RXYQQ10U7Y1B: Installation and operation manual

11 | TroubleshootingInstaller and user reference guide41RXYQQ8~20U7Y1BVRV IV Q+ series heat pump4P546229-1A – 2020.10Malfunction MeasureThe system operates butcooling or heating isinsufficient.▪ Check if air inlet or outlet of outdoor or indoorunit is not blocked by obstacles. Remove anyobstacles and make sure the air can flow freely.▪ Check if the air filter is not clogged (refer to"Maintenance" in the indoor unit manual).▪ Check the temperature setting.▪ Check the fan speed setting on your userinterface.▪ Check for open doors or windows. Close doors andwindows to prevent wind from coming in.▪ Check if there are too many occupants in the roomduring cooling operation. Check if the heat sourceof the room is excessive.▪ Check if direct sunlight enters the room. Usecurtains or blinds.▪ Check if the air flow angle is proper.If after checking all above items, it is impossible to fix the problem yourself, contactyour installer and state the symptoms, the complete model name of the unit (withmanufacturing number if possible) and the installation date (possibly listed on thewarranty card).In this chapter11.1 Error codes: Overview ............................................................................................................................................................ 4111.2 Symptoms that are NOT system malfunctions ...................................................................................................................... 4411.2.1 Symptom: The system does not operate............................................................................................................... 4411.2.2 Symptom: Cool/Heat cannot be changed over ..................................................................................................... 4411.2.3 Symptom: Fan operation is possible, but cooling and heating do not work ........................................................ 4411.2.4 Symptom: The fan speed does not correspond to the setting ............................................................................. 4411.2.5 Symptom: The fan direction does not correspond to the setting ........................................................................ 4411.2.6 Symptom: White mist comes out of a unit (Indoor unit) ...................................................................................... 4511.2.7 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit) ............................................................... 4511.2.8 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes ................. 4511.2.9 Symptom: Noise of air conditioners (Indoor unit)................................................................................................. 4511.2.10 Symptom: Noise of air conditioners (Indoor unit, outdoor unit).......................................................................... 4511.2.11 Symptom: Noise of air conditioners (Outdoor unit) ............................................................................................. 4511.2.12 Symptom: Dust comes out of the unit................................................................................................................... 4611.2.13 Symptom: The units can give off odours ............................................................................................................... 4611.2.14 Symptom: The outdoor unit fan does not spin ..................................................................................................... 4611.2.15 Symptom: The display shows "88"......................................................................................................................... 4611.2.16 Symptom: The compressor in the outdoor unit does not stop after a short heating operation......................... 4611.2.17 Symptom: The inside of an outdoor unit is warm even when the unit has stopped ........................................... 4611.2.18 Symptom: Hot air can be felt when the indoor unit is stopped............................................................................ 4611.1 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.