Panasonic U-5MX3XPQ Operation Manual

Contents

operation manual

Operation manual6 U-5~48MX3 + U-8~48ME3XPQUrban Multi air conditioner4PW16236-1Symptom 6: White mist comes out of a unitSymptom 6.1: Indoor unit■ When humidity is high during cooling operationIf the interior of an indoor unit is extremely contaminated, thetemperature distribution inside a room becomes uneven. It isnecessary to clean the interior of the indoor unit. Ask your dealerfor details on cleaning the unit. This operation requires aqualified service person.■ Immediately after the cooling operation stops and if the roomtemperature and humidity are lowThis is because warm refrigerant gas flows back into the indoorunit and generates steam.Symptom 6.2: Indoor unit, outdoor unit■ When the system is changed over to heating operation afterdefrost operationMoisture generated by defrost becomes steam and isexhausted.Symptom 7: Noise of air conditionersSymptom 7.1: Indoor unit■ A "zeen" sound is heard immediately after the power supply isturned on.The electronic expansion valve inside an indoor unit startsworking and makes the noise. Its volume will reduce in aboutone minute.■ A continuous low "shah" sound is heard when the system is incooling operation or at a stopWhen the drain pump (optional accessories) is in operation, thisnoise is heard.■ A "pishi-pishi" squeaking sound is heard when the system stopsafter heating operation.Expansion and contraction of plastic parts caused bytemperature change make this noise.■ A low "sah", "choro-choro" sound is heard while the indoor unitis stopped.When the other indoor unit is in operation, this noise is heard. Inorder to prevent oil and refrigerant from remaining in the system,a small amount of refrigerant is kept flowing.Symptom 7.2: Indoor unit, outdoor unit■ A continuous low hissing sound is heard when the system is incooling or defrost operation.This is the sound of refrigerant gas flowing through both indoorand outdoor units.■ A hissing sound which is heard at the start or immediately afterstopping operation or defrost operation.This is the noise of refrigerant caused by flow stop or flowchange.Symptom 8: Dust comes out of the unit■ When the unit is used for the first time in a long time.This is because dust has gotten into the unit.Symptom 8.1: Outdoor unit■ When the tone of operating noise changes.This noise is caused by the change of frequency.Symptom 9: The units can give off odours■ The unit can absorb the smell of rooms, furniture, cigarettes,etc., and then emit it again.Symptom 10: The outdoor unit fan does not spin.■ During operation.The speed of the fan is controlled in order to optimize productoperation.Symptom 11: The display shows “ ”.■ This is the case immediately after the main power supply switchis turned on and means that the remote controller is in normalcondition. This continues for one minute.Symptom 12: The compressor in the outdoor unit does not stop after ashort heating operation■ This is to prevent oil and refrigerant from remaining in thecompressor. The unit will stop after 5 to 10 minutes.Symptom 13: The inside of an outdoor unit is warm even when the unithas stopped■ This is because the crankcase heater is warming thecompressor so that the compressor can start smoothly.9. TROUBLESHOOTINGIf one of the following malfunctions occur, take the measures shownbelow and contact your dealer.The system must be repaired by a qualified service person.■ If a safety device such as a fuse, a breaker or an earth leakagebreaker frequently actuates, or the ON/OFF switch does notproperly work;Measure: Turn off the main power switch.■ If water leaks from unit;Measure: Stop the operation.■ If the display , the unit number and the operation lampflash and the malfunction code appears; (See figure 9)Measure: Notify your dealer and report the malfunction code.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.1 If the system does not operate at all;■ Check if there is no power failure.Wait until power is restored. If power failure occurs duringoperation, the system automatically restarts immediately afterthe power supply is recovered.■ Check if no fuse has blown or breaker has worked. Change thefuse or reset the breaker if necessary.2 If the system goes into fan only operation, but as soon as it goesinto heating or cooling operation, the system stops;■ Check if air inlet or outlet of outdoor or indoor unit is not blockedby obstacles. Remove any obstacle and make it well-ventilated.■ Check if the remote controller display shows “ ” (time toclean the air filter). (Refer to "Maintenance" in the indoor unitmanual.)1 Inspection display2 Indoor unit number in which a malfunction occurs3 Operation lamp4 Malfunction codeTEST

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