Daikin B-Series Service Manual

Also see for B-Series: Service manual Service manual

Contents

Daikin B-Series Service Manual Manual pdf 86 page image

Si06-313 TroubleshootingService Diagnosis 774.5 Thermistor or Related Abnormality (Indoor Unit)RemoteControllerDisplayC4, C9Method ofMalfunctionDetectionThe temperatures detected by the thermistors are used to determine thermistor errors.MalfunctionDecisionConditionsWhen the thermistor input is more than 4.96 V or less than 0.04 V during compressoroperation∗.∗ (reference)When above about 212°C (less than 120 ohms) or below about -50°C (more than 1,860 kohms).Note: The values vary slightly in some models.SupposedCauses Faulty connector connection Faulty thermistor Faulty PCBTroubleshootingCheck No.6Refer to P.107C4 : Indoor heat exchanger thermistorC9 : Room temperature thermistorCheck the connector connection.YESCorrect the connection.Replace the thermistor.(Replace the indoor unit PCB.)Replace the indoor unit PCB.Is it normal?Is it normal?(R1403)NOCheck No. 6Thermistor resistance checkYESNOCautionBe sure to turn off power switch before connect or disconnect connector,or parts damage may be occurred.