Symptom-based Troubleshooting ESIE12-06120 Service DiagnosisTroubleshootingNormal.Additional unit installationshould be considered.YESYESYESCaution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.Measure the temperature of suctionair and discharge air. Temperaturedifference = Suction air temp. –Discharge air temp.Possible causes as follows* Insufficient compression ofcompressor* Insufficient circulation of refrigerant* Defective electronic expansion valvePossible causes as follows* Incorrect selection of model* Affection of direct sunCheck the each section.* Clogged air filter* Soiled heat exchanger* Defective fan motor(Refer to troubleshooting “A6”.)Check the each item.Check the each item.Possible causes as follows* Refrigerant overcharge* Air in refrigerant system* Soiled heat exchanger* Short circuit of supply air* Disturbing item in airflow* Defective fan motor of outdoor unit(Refer to troubleshooting “E7”.)Refrigerant shortage possiblygenerates trouble.NONONOYESNONOYES YESNOAfter vacuum drying, chargecorrect amount of refrigerant.Temperaturedifference for cooling should bebetween 8 and 18˚C.Doesany frostgenerate around inletport of indoor unit heat exchangeror outlet port of electronicexpansionvalve?Does the heatload increase after installationof the unit?Is theoperation current less thanspecified level?Does indoor unitairflow rate down?Is thelevel of high pressure higherthan normal level?
