AIR CONDITIONER - Heronhill Air Conditioning Ltd

9. TROUBLESHOOTING CHARTFILE NO. SVM-050209-1. Troubleshooting ProcedureFollow the details of 9-2. Basic Check Items.If there is no trouble corresponding to 9-2, checkwhether or not there are faulty parts following9-4. Self-Diagnosis by Remote Control.9-2. Basic Check Items9-2-1. Power supply voltageThe line voltage must be AC 220 − 240V. If it is notwithin this range, the air conditioner may not operatenormally.9-2-2. Incorrect cable connection between Indoorand outdoor unitsThe indoor unit is connected to the outdoor unit with5 cables (Heat pump model) or 3 cables (Cooling Onlymodel). Check that the indoor and outdoor units havebeen properly connected with terminals assigned thesame numbers. If the connectors are not properlyconnected, the outdoor unit will not operate normally,or OPERATION lamp and TIMER lamp will blink (5Hz).9-2-3. Program controlThe microcontroller operates as shown in Table 9-2-1to control the air conditioner. If there are any operationalproblems, check whether or not the problemscorrespond to Table 9-2-1. If they correspond to theTable, they are not problems with the air conditioner,but they are indispensable operations to control andmaintain the air conditioner properly.1 When the main power supply is turned on,the OPERATION lamp on the indoor unitblinks.2 The indoor fan motor speed does not changein the Dry operation.3 The compressor is not turned off even thoughthe room temperature is in the range that thecompressor is turned off.4 The compressor is not turned on and off eventhough the thermo control is operated in theDry operation.5 The PRE-DEF. lamp is indicated when theHeating operation starts.6 The outdoor fan motor stops in the Heatingoperation.7 The compressor is not turned on even thoughthe room temperature is in the range that thecompressor is turned on.8 The operation mode changes in theAutomatic operation.9 The Fan only operation continues in theAutomatic operation.10 The Hi-POWER operation does not work.Table 9-2-1No. Operation of air conditioner DescriptionsThe OPERATION lamp blinks to indicate that power is turned on.If the [ ] button is pressed, the lamp stops blinking.The indoor fan motor speed is automatically controlled in the Dryoperation.The compressor has a function that it is not turned off for3 minutes after it is turned on even though the room temperatureis in the range that the compressor is turned off.In the Dry operation, the compressor is turned on and offautomatically at the regular intervals, independent of the thermocontrol.The PRE-DEF. lamp is indicated during the Defrostingoperation or if the indoor heat exchanger temperature is low whenthe Heating operation starts. At this time, the indoor fan motorstops to prevent cold air from blowing in the room.When the indoor heat exchanger temperature is high, the outdoorfan motor is stopped by the high-temperature limit controloperation.The compressor is not turned on in the restart delay timer(3-minutes timer) operation. It is also not turned on after the powersupply is turned on because of this timer operation.In Automatic operation, the room temperature is detected all timefor control fan speed and the operation mode is changed every15 minutes according to difference between the room temperatureand the preset temperature.When the room temperature is in the range (Preset temperature± 1°C), the Fan only operation is selected.This operation does not work when the unit is in the Dry operationor Fan only operation.− 53 −