Troubleshooting SiBE811001EB183 CONVENI-PACK8.4.12 Indoor Unit Thermistors AbnormalityError Code C4, C5, C9ApplicableModelsAll indoor modelsMethod of ErrorDetectionError detection is carried out by temperature detected by each thermistor.Error DecisionConditionsWhen the thermistor becomes disconnected or shorted while the unit is running.SupposedCauses Wiring defect Defective indoor unit thermistor Defective indoor unit PCBTroubleshootingNote:∗1. Error code and thermistorRefer to P.293.Error code Thermistor Electric symbolC4 Heat exchanger liquid pipe thermistor R2TC5 Heat exchanger gas pipe thermistor R3TC9 Suction air thermistor R1TNOIs the operationnormal?Remove the thermistor from theindoor unit PCB, and then makeresistance measurement of thethermistor using a multiple meter.Is it normal?5 kΩ to 90 kΩReplace the indoor unit PCB.YESNormal (The error is caused byfaulty contact.)YESReplace the thermistor.NOCaution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.Remove the thermistor (∗1) from theindoor unit PCB, and then insert itagain.CHECK 13CHECK 13
