Panasonic U10ME4 Operation Manual

Operation manual6 U-5~18MX4 + U-8~16ME4✽M + U-8~16ME4 + U-4~6ML5Urban Multi air conditioner4PW40727-1A9.2. Maintenance before a long stop period (e.g. atthe end of the season)■ Let the indoor units run in fan only operation for about half a dayin order to dry the interior of the units. Refer to "7.1. Cooling,heating, fan only, and automatic operation" on page 3 for detailson fan only operation.■ Turn off the power. The remote controller displays disappear.■ Clean air filters and casings of indoor units. Refer to theoperation manual supplied with the indoor units for details onhow to proceed and make sure to install cleaned air filters backin the same position.10. FOLLOWING SYMPTOMS ARE NOT AIRCONDITIONER TROUBLESSymptom 1: The system does not operate■ The air conditioner does not start immediately after the ON/OFFbutton on the remote controller is pushed.If the operation lamp lights, the system is in normal condition.To prevent overloading of the compressor motor, the airconditioner starts 5 minutes after it is turned ON again in case itwas turned OFF just before. The same starting delay occursafter the operation mode selector button was used.■ If "Centralized Control" is displayed on the remote control andpressing the operation button causes the display to blink for afew seconds.This indicates that the central device is controlling the unit.The blinking display indicates that the remote control cannot beused.■ The system does not start immediately after the power supply isturned on.Wait one minute until the micro computer is prepared foroperation.Symptom 2: Cool/Heat cannot be changed over■ When the display shows " " (change-over undercentralized control), it shows that this is a slave remotecontroller.■ When the cool/heat changeover remote control switch isinstalled and the display shows " " (change-over undercentralized control).This is because cool/heat changeover is controlled by the cool/heat changeover remote control switch. Ask your dealer wherethe remote control switch is installed.Symptom 3: Fan operation is possible, but cooling and heating do notwork.■ Immediately after the power is turned on.The micro computer is getting ready to operate. Wait 10minutes.Symptom 4: The fan strength does not correspond to the setting.■ The fan strength does no change even if the fan strengthadjustment button in pressed.During heating operation, when the room temperature reachesthe set temperature, the outdoor unit goes off and the indoor unitchanges to whisper fan strength.This is to prevent cold air blowing directly on occupants of theroom.The fan strength will not change even if the button is changed,when another indoor unit is in heating operation.Symptom 5: The fan direction does not correspond to the setting■ The fan direction does not correspond to the remote controldisplay. The fan direction does not swing.This is because the unit is being controlled by the microcomputer.Symptom 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 low.This 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: The remote controller display reads "U4" or "U5" and stops,but then restarts after a few minutes■ This is because the remote control is intercepting noise fromelectric appliances other than the air conditioner. This preventscommunication between the units, causing them to stop.Operation automatically restarts when the noise ceases.Symptom 8: Noise of air conditionersSymptom 8.1: 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 8.2: 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 8.3: Outdoor unit■ When the tone of operating noise changes.This noise is caused by the change of frequency.Symptom 9: 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 10: The units can give off odours■ The unit can absorb the smell of rooms, furniture, cigarettes,etc., and then emit it again.Symptom 11: The outdoor unit fan does not spin.■ During operation.The speed of the fan is controlled in order to optimize productoperation.