SiUS091601EA Troubleshooting for FTX, FVXS SeriesPart 6 Service Diagnosis 1245. Troubleshooting for FTX, FVXS Series5.1 Indoor Unit PCB AbnormalityError Code A1Method of ErrorDetectionThe system checks if the circuit works properly within the microcomputer of the indoor unit.Error DecisionConditionsThe system cannot set the internal settings.SupposedCauses Wrong models interconnected Defective indoor unit PCB Disconnection of connector Reduction of power supply voltageTroubleshootingCorrect the connection.OK? Check the power supplyvoltage.Start operation.Voltage as rated?Error repeats?Check the power supplyvoltage.Start operation.Voltage as rated?Error repeats?Error repeats?Combination of theindoor and outdoor unitmatched?Check the connection ofconnectors.YESNONOYESNONOYES(R23407)Caution* To secure the connection,disconnect the connectors onceand then reconnect.YESNOYESNOYESNOYESMatch the compatiblemodels.Correct the powersupply.Replace the indoor unitPCB (control PCB).Completed.Completed.Correct the powersupply.Replace the indoor unitPCB (control PCB).Completed.Be sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.
