SiUS28-902_a Troubleshooting by Indication on the Remote ControllerTroubleshooting 1283.34 “P4 ” Outdoor Unit: Malfunction of Inverter Radiating FinTemperature Rise SensorRemoteControllerDisplayP4ApplicableModelsRZQ18~30PVJUMethod 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 outdoor unit P.C.B. (A1P)TroubleshootingCaution Be sure to turn off the power switch before connecting or disconnectingthe connector, or parts could be damaged.Power OFFPower ONReplace thecompressor.Replace the outdoorunit P.C.B. (A1P).EndYESYESNONODisconnect the cable from thecompressor, and then checkthe compressor for theinsulation resistance.Remove and insert the finthermistor connector [X111A].The insulationresistance is low (i.e., notmore than100kW.)Turn ON thepower supply, andthen check whether or notthe malfunctionrecurs.
