12. Troubleshooting
Contents
1. Is connector connection good Replace the sencor 44 Repair the connector Service manual 12 7 Operation lamp off and Timer lamp flashes Operation lamp off and Timer lamp flashes After changing the main control board check if the failure realease N Indoor PCB is defective The voltage of power supply is too low less than 187V No Outdoor unit fault such as the compressor Power supply fault 12 8 Operation lamp on and Timer lamp flashes EEROM error indoor PCB is defective 12 9 Operation lamp flashes Timer lamp flashes This is alarm signal when the main chip can t detect over zero signal When such failure occurs the main control board must have fault 45 Service manual 13 Characteristic of temperature sensor PES SI ee 2 8 56 3694 19 132631 46 40459 6 493161 21 120561 48 37348 IONES IO A RT AER 2 sm 25 o 62 3 1918 o 352024 27 91245 54 2959 6 25494 3 69814 60 23577 8 225662 35 64002 62 21907 9 2180M 36 61306 63 21124 12 187177 39 53069 6 18963 14 169341 41 49639 68 17665 15 161156 42 476235 69 17055 462. Service manual 12 Troubleshooting 12 1 Display board Infrared signal receptor OPERATION AUTO TIMER QA PRE DEF Operation The indicator flashes once every second after power is on and illuminates when the air conditioner is in operation Timer indicator The indicator illuminates then TIMER is set ON PRE DEF indicator For cooling amp heating mode only The air conditioner starts defrosting automatically if outdoor unit frosts in heating operating At this time PRE DEF indicator illuminates Auto indicator This indicator flashes when the air conditioner is in AUTO operation ECON indicator This indicator illuminates while the air conditioner is in economic operation 41 Service manual 12 2 Troubleshooting For cooling mode Operation Timer Failure phenomenon lamp lamp Indoor fan speed has been out of control for over 1 minute Indoor room temp or evaporator sensor is open circuit or short circuit Over current protection of the compressor occurs 4 times EEROM error No over zero signal X Extinguish xz Flash at 5Hz For heat pump mode Operation Timer Defrosting Failure phenomenon lamp lamp lamp Over current protection of the compressor occurs 4 times Indoor fan speed has been out of control for over 1 minute X Extinguish x Flash at 5Hz 49 Service manual 12 3 Diagnostic chart After energizing no indicator is lighted and the air conditioner can t be opera
3. ted After energizing the air conditioner can not be operated Check if AC 220V power supply outputs to indoor PCB Yes Check if AC 220V exists at the primary coil of transformer DS La Indoor PCB is defective Check if AC 14 5V exists at the secondary coil of transformer O Yes No y Take off the secondary plug of transformer and then check if AC 14 5V exists at the secondary coil of transformer l No y Yes Indoor PCB is defective Indoor PCB is defective 43 Service manual 12 4 Resetting phenomenon often occurs during operation That is automatically entering to the status when power is on The reason is that the instantaneous voltage of main chip is less than 4 5V Check according to the following procedure Resetting phenomenon often occurs during operation Yes y After changing indoor PCB check if the failure realease Yes y After changing indoor fan motor check if the failure realease Indoor PCB is defective YES Power supply circuit has problems 12 5 Operation lamp flashes and Timer lamp off Is connector connection good Is voltage being applied to the fan motor Fan motor is defective Repair the connector Indoor PCB is defective 12 6 Operation lamp flashes and Timer lamp on
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