Troubleshooting SiUS041501E87 Service Diagnosis4.20 Electrical Box Temperature RiseError Code L3Method of ErrorDetectionAn electrical box temperature rise is detected by checking the radiation fin thermistor with thecompressor off.Error DecisionConditions With the compressor off, the radiation fin temperature is above A. The error is cleared when the radiation fin temperature drops below B. To cool the electrical components, the outdoor fan starts when the radiation fin temperaturerises above C and stops when it drops below B.SupposedCauses Defective outdoor fan motor Short circuit Defective radiation fin thermistor Disconnection of connector Defective outdoor unit PCBTroubleshootingCheck No.17Refer to P.98Check No.19Refer to P.99A B C°C °F °C °F °C °F09/12 class, RKN18NMVJU 82 179.6 65 149 70 158RXN18NMVJU, RK(X)18NMVJU, 24 class 90 194 64 147.2 81 177.8CautionWARNINGTo cool the electrical components,the outdoor fan starts when theradiation fin temperature risesabove C and stops when it dropsbelow B.(R21671)YESNOYESNGNOOKNOYESTurn off the power and turn it onagain.Check the radiation fintemperature.Radiation fin dirty?Check No. 19Check the outdoor fan.Error again or outdoorfan activated?Replace the outdoor unitPCB (main PCB).Clean up the radiation fin.Be sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.Replace the outdoor fanmotor.Correct the connectorsand fan motor lead wire.Replace the outdoor unitPCB (main PCB).Above A?Check the installationcondition.Go to Check No. 17.
