SiBE041134EB TroubleshootingService Diagnosis 914.23 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 Silicone grease is not applied properly on the radiation fin after replacing the outdoor unitPCB.TroubleshootingCheck No.17Refer to P.101Check No.19Refer to P.102Note: Refer to Silicone Grease on Power Transistor / Diode Bridge on page 112 for details.A (°C) B (°C)98 78CautionTurn 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.(R22540)NONGOKNOYESCheck the radiation fintemperature.NOYESYESAbove A ˚C?Check No. 19Check the outdoor fan.Error displayed again? Has the PCB beenreplaced? Check if silicone grease isapplied properly on theradiation fin. If not, applythe silicone 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.
