Troubleshooting for FDMQ Series SiUS091601EA143 Part 6 Service DiagnosisNote6.5 Humidifier or Related AbnormalityError Code AFMethod of ErrorDetectionWater leakage from humidifier(s) is detected based on the float switch ON/OFF changeover whilethe system is not operating.Error DecisionConditionsThe float switch changes from ON to OFF while the system is OFFSupposedCauses Defective float switch Error in water drain system of humidifier(s) Clogged electric expansion value in humidifier(s) Defective indoor unit PCBTroubleshootingThe system continues to operate with the thermostat OFF even while the error code is displayed.YESYESNONOCautionBe sure to turn off the power switch before connecting or disconnectingconnectors, or parts may be damaged.The float switch may bedefective. Check if thedrain-up height and thehorizontal pipe lengthexceed the specifications.Clogged water drainsystem, clogged drainpump, or faulty float switchReplace the indoor unitPCB (control PCB).(R24055)Humidifier(s)connected to the system?Is the waterdrain system of thehumidifier normal?
