5913.8 Analysis method for no error code, no cooling / nowarming13.8.1 Preparation for appropriate diagnosisIn order to obtain appropriate operation characteristics, minimum 15 minutes or more operation time [testingoperation (rated operation)] is required.1. Method of rated operation (rated operation)For the models which have two buttons of “emergency operation and forced cooling operation”, press forcedcooling button once. For the models which have only emergency operation button, press the button once for 5seconds and when hear “beep” sound, release the button. Then, cooling operation starts.2. Checking the mal-functions of indoor / outdoor units1) Any obstacles against heat release and air suction? (short circuit)(Forget to remove the outdoor unit cover or fallen leaves blocking the outdoor unit)2) Are the indoor unit air filters clean? (obstructing heat suction)3) Is the setting temperature on the remote controller correct? (is the setting temperature set at lower/higherthan the room temperature?)13.8.2 Understanding and verification of refrigerant cycleHeat exchangerHeat exchangerCompressor（COMP）4-wayvalveCondenser（COND）ExpansionvalveLiquid side2-wayvalveGas side3-wayvalveHigh tempHigh pressureAirMid temp /High pressureLiquidLowtemp/PressureliquidLow tempLow pressureAirEvaporator（EVA） FMFanFanCapillary tubeIndoor unit Temp differenceSuction temp ＜Cooling＞ ８ or moreRelease temp ＜Heating＞ １４ or more＊Measured after 15 mins with strongfan operation(Cooling)Gas pressure 0.9～1.2MPaLow temp /Low pressureAirLow temp /Low pressureliquid(Cooling Heating )High temp /High pressureAirMid temp /high pressureliquidLow temp /Low pressureLiquidLow temp /Low pressureAirMid temp /High templiquid(Heating)Gas pressure 2.2～ 3.0MPaRelease tempOutdoor tempSuction tempHeat exchangertempHeat exchangertempHigh temp / highpressureAir「Indoor 「」 Outdoor」
