Troubleshooting by Indication on the Remote Controller Mini UM S/M136 Troubleshooting4.28 “L4” Outdoor Unit: Malfunction of Inverter Radiating FinTemperature RiseRemoteControllerDisplayL4ApplicableModelsAII outdoor unit modelsMethod ofMalfunctionDetectionFin temperature is detected by the thermistor of the radiation fin.MalfunctionDecisionConditionsWhen the temperature of the inverter radiation fin increases above 99˚C.SupposedCauses Actuation of fin thermal (Actuates above 99˚C) Defect of inverter PC board Defect of fin thermistorTroubleshooting∗ Refer to thermistor resistance / temperature characteristics table on P190.(V3183)Resistancecheck of the radiator finthermistorMeasure the resistance of theradiator fin thermistor.Defect of power unit radiation.• Intake port is clogged• Radiator fin is dirty• Outdoor temperature is highNOReplace the thermistor.YESAbnormalIs reset possible?Reset and operate.NormalReplace the inverter PC boardNOYESTemperatureof the radiator fin rises.Actuates at min.99 ˚CCautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.
