SiBE28-805 Troubleshooting by Indication on the Remote ControllerTroubleshooting 1873.36 “P4” Outdoor Unit: Malfunction of Inverter Radiating FinTemperature Rise SensorRemoteControllerDisplayP4ApplicableModelsCMSQ200A7, 250A7Method ofMalfunctionDetectionResistance of radiation fin thermistor is detected when the compressor is not operating.MalfunctionDecisionConditionsWhen the resistance value of thermistor becomes a value equivalent to open or short circuitedstatus.★ Malfunction is not decided while the unit operation is continued."P4" will be displayed by pressing the inspection button.SupposedCauses Defect of radiator fin temperature sensor Defect of inverter PC boardTroubleshootingCautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.Power OFFPower ONReplace thecompressor.Replace the fan motorReplace the fan driverPC board.Replace the inverterPC board.EndYESYESYESNONONODisconnect the cable from thecompressor, and then checkthe compressor for theinsulation resistance.Disconnect the cable from thefan, and then check the fanmotor for the insulationresistance.Remove and insert the finthermistor connector [X111A].The insulationresistance is low (i.e., not more than100kΩ.)The insulationresistance is low (i.e., not more than1MΩ.)Turn ON thepower supply, and then checkwhether or not the malfunctionrecurs.
