155. Troubleshooting GuideCorrective MaintenanceFault Phenomena:1,Air Volume Indicator Light Flashing2,Machine out of operationCause:1,Motor's rotating speed is abnormal.2,Motor out of operationSubstitute Part: Motor,Power Circuit AssemblyCheck if the motor lead wire terminals disconnectwith the power circuit assemblyReconnect the motor lead wire terminalon the power circuit assemblyAbnormalRotating blade by hand and check the motorshaft lockIn running condition to check the CN4 TerminalvoltageAbnormalNormalEliminate any blade contact orforeign objectMotor rotating heavily Replace the motorassemblyAbnormalAbnormalReplace the power circuit assemblyNormalRun the machineAbnormalReplace the motor assemblyNormalUnplug&plug in and operate themachineAbnormal In checking mode to checkthe whole machineAbnormal Replace the diagnoseddefective partsAbnormalNormal