SiBE041434E TroubleshootingService Diagnosis 944.23 Radiation Fin Temperature RiseError Code L4Method of ErrorDetectionA radiation fin temperature rise is detected by checking the radiation fin thermistor with thecompressor on.Error DecisionConditions If the radiation fin temperature with the compressor on is above A°C. The error is cleared when the radiation fin temperature drops below B°C. If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other errorSupposedCauses Defective outdoor fan motor Short circuit Defective radiation fin thermistor Disconnection of connector Defective outdoor unit PCB Silicon grease is not applied properly on the radiation fin after replacing the outdoor unitPCB.TroubleshootingCheck No.17Refer to P.103Check No.19Refer to P.104Note: Refer to Silicon Grease on Power Transistor / Diode Bridge on page 115 for detail.A (°C) B (°C)20/25/35 class 98 7842/50 class 100 57CautionTurn off the power. Then, turn onthe power to restart the system.Be sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.(R21437)NONGOKNOYESCheck the radiation fintemperature.NOYESYESAbove A ˚C?Check No. 19Check the outdoor fan.Error displayed again? Has the PCB beenreplaced? Check if silicon grease isapplied properly on theradiation fin. If not, applythe silicon grease.Replace the outdoor unitPCB (main PCB).Replace the outdoor fanmotor.Correct the connectors andfan motor leads.Replace the outdoor unitPCB (main PCB).YESNORadiation fin dirty?Clean up the radiation fin.Check the installationcondition.Go to Check No. 17.
